CHANGES

Changes
=======

The highlighted changes are shown for the following production releases. Each
release will have included many additional new features and improvements.

You can view the differences in tagged versions as follows:

  git log --pretty=format:"%Cblue%h %Cgreen%cn %Cred(%cr) %Creset%s %n%b %N" --graph "v0.3.2..v0.4.1"

v0.25.2
-------

 - Fixes:
   - KPV: Jetstream 41 Np on ground kpv can_operate and parameter naming

v0.25.1
-------

 - Merge helicopter profile into main source code
 - Replace httplib2 with requests
 - Updates to support latest versions of networkx
 - Engine KPV/Phases:
   - Updated Engine 5 minute rating for Prop aircraft to look for end of takeoff
   - New phase for MCP
   - Added Takeoff Rating Duration(KPV)
   - added eng * over threshold duration kpvs
   - Added Eng param 5 sec max during rating kpvs
 - Heading Deviation During Takeoff:
   - reworked following experience with original algorithm and further advice from UK CAA.
   - renamed HeadingDeviationFromRunwayAbove80KtsAirspeedDuringTakeoff -> HeadingVariationAbove80ktsAirspeedDuringTakeoff
   - Handle nose gear not working correctly
   - fallback to mag heading if true not available
   - Handle the case when pitch changes before 80kts
 - Splitting:
   - Airborne: do not break early if no alt change
   - Transient dips below 80kts not relevant to flight splitting, so filtered out
   - Revision to _get_normalised_split_params as we should normalise each parameter separately
   - ignore inconsistent airspeed

 - Added:
   - Derived: Collective
   - Derived: Slope angle to aiming point
   - Derived: Groundspeed Signed (for negative groundspeeds when being pushed back)
   - Multistate: Eng Bleed Open
   - KPV: Heights at distances on approach.
   - KPV: Boeing 787 fuel imbalance
   - KPV: Jetstream 41 Test for duration of propellor operation between 72% and 80% Np.
   - KPV: ElevatorPreflightCheck
   - KPV: AileronPreflightCheck
   - KPV: RudderPreflightCheck
   - KPV: FlightControlPreflightCheck
   - Libary: slices_split
   - Libary: slices_remove_overlaps
 - Removed:
   - KPV: SpeedbrakeDeployedWithConfDuration
   - KPV: AccelerationLateral5secs - B787 frames only
   - Libary: Moved Library.is_day() to Flight Data Utilities
 - Improvements:
   - Derived: Vert Spd Inertial - modified to not enforce zero rates of descent outside climbs and descents (Helicopters)
   - KTI: Touchdown: peroid of interest start at 5ft before touchdown if Alt Rad
   - KTI: Touchdown: touchdown point is earliest of calculated and GOG index
   - KPV: Hdg Var Tdown +4Sec To 60Kts Airspeed - now uses Airspeed True
   - KPV: Hdg Var Tdown +4Sec To 60Kts Airspeed - allow for different timing offset in touchdown KTI and heading array
   - Libary: Haversine formula - adapt to support numpy arrays
   - Multi: Speedbrake Deployed requires left and right spoiler deployed to indicate speedbrake
   - Multi: AP Vertiacl Mode added additional long mode states
   - Node: multistate parameters supported in create_kpvs_at_ktis
   - Phase: airborne phase for helicopters
   - Utils: list_parameters - Exclude AFR attrs
 - Fixes:
   - Attribute: DestinationAirport - fix '0000' airport code
   - Attribute: Runway identification for aircraft with recorded latitude, longitude, ILS 
                glideslope and ILS localizer but N|OT ILS frequency amended to use position data.
   - Derived: removing spikes in the tailwind values at touchdown
   - KPV: Rate of Descent Below 80 Kts revised to provide correct indexes
   - KPV: GW Conditional @ tdown - ROD are negative values
   - KPV: TCAS moved Preventive from TA to RA
   - KPV: DecelerationFromTouchdownToStopOnRunway - Trap for invalid groundspeed
   - KPV: Roll Rate Max corrected to report peaks only once
   - KPV: Suppression of roll rates below 5deg/sec as too small to be significant (and just results in huge number of KPVs)
   - KPV: heading var > 80kts - index as is relative to 80kts not start of takeoff
   - KPV: heading var > 80kts - changed datum to use median from start of valid airspeed to 80kts to
          remove invalids where aircraft stationary off centre before correcting before 80kts airspeed
   - Multi: Combine TCAS RA 1&2 into one multistate
   - Phase: Mobile - Support mobile from start of data
   - Phase: Taxiing - can_operate Rejected Takeoff required
   - Phase: TaxiOut - handle no taxi (data starts on runway)
   - Phase: Bottom of Descent - case of None end of section handled
   - Phase: Landing: use mobile end instead of the remainder of the array in cases where 
            the aircraft doesn't turn off the runway before engine stop.
   - Phase: Taxi In: fix creating invalid slice when engines start late (engine-less taxi?)
   - Phase: Taxi Out: fix crashing invalid slice when engines stop early (engine-less taxi?)

Plus various other small fixes and test improvements.

v0.24.5
-------
 - Fixes:
  - Vertical Speed Inertial Fix for Helicopters

v0.24.4
-------
 - KTI: DistanceFromAirport
 - Fix: Longitude was smoothed unnecessarily on the -180 / +180 roll over which
   caused vis artifacts

v0.24.3
-------
 - KPVs: Split taxi KPVs into taxi in/out
 - Fix: Failing version test

v0.24.2
-------
 - Fix: Regression: Correctly detect Mobile phase at the begining of the data


v0.24.1
-------
 - Make 100% of tests pass
 - Support for helicopters


v0.23.2
-------
 - Fix: Correctly detect Mobile phase at the begining of the data


v0.23.1
-------
 - New:
   - KPV: GrossWeightConditionalAtTouchdown (Airbus)
   - KPV: RudderPedalMin (temporary)
   - KPV: RudderPedalMax (temporary)
   - Phase: IANFinalApproachCourseEstablished used by IAN KPVs
   - Phase: IANGlidepathEstablished used by IAN KPVs
 - Improvements:
   - AirspeedSelectedForApproaches compensates for large offsets.
   - APUStart and APUStop derive at the edges of the data.
   - Derive Track True Continous from Track True with Drift being optional.
   - EngGasTempDuringEngStart handles engines already running at start of data.
   - Fuel Flow parameters are used for splitting flights.
   - Handle Takeoff at start of data during Taxi Out.
   - most_points_cost algorithm to allows for differing numbers of data samples in the array.
   - SpeedbrakeDeployed supports Spoiler renaming.
 - Fixes:
   - coreg no longer overflows due to np.int32.
   - Heading during phase KPVs no longer output 360 for very small negative numbers.
   - Mobile: Ground Only flights with no Groundspeed will not raise Exception.


v0.22.2
-------
 - repair mask of lat and lon results in large speed increase for poor quality signals


v0.22.1
-------

 - New:
   - Multistate: Smoke Warning
   - KPV: Smoke Warning Duration
   - KPV: Roll Cycles During Initial Climb
   - KPV: Thrust Reversers Deployed During Flight Duration
   - KPV: Groundspeed At Liftoff
   - Phase: Stationary
   - KTI: Movement Start
   - KTI: Movement Stop
   - KTI: APU Start
   - KTI: APU Stop
 - Improvements:
   - Gear up selection improved accuracy
   - Align to Takeoff and Go Around param for improved KPV accuracy
   - Remove Gear recycling from Altitude at gear up/down selection
   - Accel Norm Takeoff changed to liftoff to 35ft
   - Overflow correction: use maximum change of value instead of ptp
   - Altitude Radio: use dynamic overflow values
   - Use Stationary phase to detect Movement Start / Stop
   - calculate_timebase: Small speed increase
   - Added node Cacheing
   - SAT: derive from Sat (1/2/3)
   - ThrustReversers: derive even if a single Thrust Reversers Deployed is available
   - Mobile phase: use Groundspeed to expand the phase
   - Reduced period of level flight allowed during level bust
 - Fixes:
   - find_toc_tod: handle masked data at mid point of descent/climb
   

v0.21.8
-------
 - Speedbrake Selected update for A330

v0.21.7
-------
 - Speedbrake update for A330: use spoilers 2 and 8

v0.21.6
-------
 - Updated heading_diff to operate on arrays
 - Fix: scan_ils handle heading moving between 360 and 0

v0.21.5
-------
 - bumped straighten longitude threshold

v0.21.4
-------
 - HDF duration fixes

v0.21.3
-------

 - Boeing 747:
   - Added additional Vib parameters
   - Added Slat discrete multistates parameters
   - Derive Slat Angle from Slat Discretes
 - Airbus A380:
   - Added 5th left and right fuel tanks
 - New:
   - Derived Parameter: Slope Angle To Landing
 - Improvements
   - Remove runway elevations from Altitude QNH.
   - TAT: Fixed broken can_operate
   - StableApproach: use airspeed relative as low limit
   - Airspeed At Flap Extension amended to use synthetic flap extension
   - FuelQtyWingDifferenceMax: restricted to airborne phases
   - Level Bust: check if index is within period of level flight
   - Level Bust: reinstated test to prevent short hop flights being detected as Level bust
   - TOGA KPV's: Measure at known state instead of interpolated transition

v0.21.2
-------

 - Fixed
   - library.including_transition: identify angles


v0.21.1
-------

 - Added
   - machsat2tat() function to allow reverse computation of adiabatic
     temperature rise.
   - new derived parameter "SAT International Standard Atmosphere" to make it
     clear that this is not a measured air temperature, but the SAT for ISA
     conditions only
   - FirstEngFuelFlowStart / LastEngFuelFlowStop KTIs
   - EngRunning parameters added for each engine independently
   - EngRunningDuration KPVs added
   - AirspeedWithFlapIncludingTransition20AndSlatFullyExtendedMax KPV
   - TakeoffStart KTI
   - Distance Flown Derived Paramete
   - ThrustReversersEffective multistate
 - Fixed
   - AltitudeOvershootAtLevelBust KPV: fix duplicates
   - Altutude During Climbing: merge phases to detect altitude changes
   - Fix for calculate timebase to account for flights taking off just before
     midnight
   - Fix some incorrect and missing units
 - Improved
   - FlapWithSpeedbrakeDeployedMax uses Including Trans
   - LandingGearToFlapDuration handles edge cases
   - GearDownToLandingFlapConfigurationD: use v* table
   - improved node reprocessing with process_flight()
   - Use Climb and Descent phases for Altitude Climbing / Descending KTIs
   - process_flight: Added reprocess kwarg
   - process_flight: Added -initial option
   - Split HDF to Segments fallback_dt can now be relative to start or end of
     data
   - Added Airborne dependency to Takeof
   - Remove dependency for Airspeed from Grounded
   - ILS established improvements
   - Heading during landing


v0.20.2
-------

 - Fixed
   - DistCentreLine where groundspeed doesn't register below 60kts
 - Improved
   - StableApproach: tweaked stability criteria


v0.20.1
-------

 - Fixed
   - Added missing Eng Hotel Mode test data
   - Change of elevation test to avoid problems with lack of airfield identification.
   - Don't detect GROUND_ONLY for slow segments with no engine parameters
   - Fast duration calculation in split segments
   - ILS Established no longer throws away phases where starts are established
   - Prevent Airspeed FFP raising error for fully masked airspeed (GROUND_ONLY)
   - plot_parameter actually uses show kwarg
 - Improved
   - API changes to allow passing of segment type (GROUND_ONLY)
   - Acceleration Longitudinal KPVs changed to use offset removed
   - Added including_transition function for Flap Including Transition
   - Added pre_flight_kwargs as kwarg to process_flight to allow customisation of PRE_FLIGHT_ANALYSIS hook
   - Airspeed Minus Airspeed Selected For 3s uses an upsampled Airspeed Selected in case of a low sample rate
   - Altitude Tail reworked following known tail scrape cases
   - Climb Acceleration Start smooths noisy Eng Np signal
   - Detection of handover between pilots
   - EngTorquePercent65KtsTo35FtMin handles no takeoffs being detected (GROUND_ONLY)
   - Fuel Qty naming convention updated and Fuel Qty (C) added
   - Identification of Ground Only Rejected Takeoffs (GROUND_ONLY)
   - Merging of two-source flap data to cater for aircraft with mismatched left and right flap sensors
   - Segment type detection with fully masked airspeed
   - Threshold change to cater for low rate of flap movement on first stage of flap selection (737NG applies)
   - ThrustAsymmetryWithThrustReversersDeployedMax amended to suppress transients.
   - Transition altitude from Altitude AAL is now a setting
   - Updated limits within StableApproach
   - Vibration derived parameters and KPVs include additional dependencies
   - api_handler: Use form content type in requests
   - ignore_errors option added to ProcessFlight to continue processing if exceptions are raised within nodes
   - library.scan_ils: Fallback for invalid ils signal
   - process_flight returns dictionaries of nodes rather than lists of instances for matching instances to nodes
 - Added
   - Dual Input By Capt/FO Max KPVs
   - Eng Gas Temp Above Normal Max Limit Duration KPVs
   - Lateral distances on runway at Touchdown
   - PitchRate35ToClimbAccelerationStartMax KPV
   - Straighten algorithm suited for Longitude
   - json_tools module unit tests


v0.19.1
-------

 - Fixed
   - "Index at value or level off" needs to pass frequency to "Find level off"
     as this is slope dependent.
   - Climb Acceleration Start - trap for cases where the aircraft does not
     reach a normal acceleration altitude.
   - fix to AirspeedMinusV2At35FtDuringTakeoff to use interpolated value
     instead of last recorded value
   - Trap for null slices in find_nearest_slice
   - Stick Shaker and Pusher amended to OR recorded parameters instead of
     merging
   - ApproachAndLanding: remove ugly frame hack
   - Trap for error condition where both arguments are null in approach for
     'LANDING' case.
   - Trap for null list in slices_and_not
   - flight_phase: ApproachAndLanding 146-301 noise fix
   - find_low_alts: fix for level_flight during noise
   - Flap Angle offset should not be changed unless really necessary.
 - Improved
   - Change to Altitude Radio offset removed to only adjust positive offsets
   - change to Rad Alt offset removed to try and cater for increases in rad alt
     during acceleration
   - Radio Alt offset removed retain origional mask following medfilt
   - SlicesRemoveSmallSlices rearranged to return null cases quickly - test
     cases extended.
   - find_toc_tod amended to handle None arguments to _slice
   - Find Top of Climb & Descent amended to retain best of 4-part algorithm but
     remove confusing duplication of Bottom of Descent code.
   - Top of Climb / Top of Descent expanded to provide bottoms of climb and
     descent using similar algorithms. Unsatisfactory, but included as an
     interim step. Also, find_level_off included to avoid problems of reverse
     slicing.
   - Bottom of Descent simplified to match the Top of Descent in using Cruise
     Climb Descent phases, hence ensuring matched pairs of KPVs.
   - Combined Descent replaced by Descent
   - Frequency parameter passed out of flight phase calculations into
     find_low_alts.
   - Initial Climb phase amended to cater for climbs that do not reach 1000ft.
     Also, Initial Climb flight phase test added and helper build_kti added.
   - Mobile phase made solely dependent upon heading rate to avoid problems
     with groundspeed signals on stand.
   - EngOilPressFor20SecDuringCruiseMax is now for 60 seconds
 - Added
   - Roll At Low Altitude KPV added.
   - added AirspeedWithFlapIncludingTransition20AndSlatFullyExtendedMax KPV
   - Heading Change KPV added.
   - Descent flight phase added, with test case.
   - Stall Warning multistate parameter added for A340-300 and E505 types,
     which both carry dual systems.


v0.18.2
-------

 - Fixed
   - Flap Angle offset should not be changed unless really necessary
   - EngOilPressFor20SecDuringCruiseMax is now for 60 seconds


v0.18.1
-------

 - Fixed
   - Touchdown will no longer trigger braking if the aircraft is accelerating forwards
   - Windows temporary file paths
 - Improved
   - Approaches with too little valid glideslope data revert to "visual" approach estimation
   - blend_parameters library function expanded to provide both linear and cubic interpolation
   - calculate_surface_angle library function simplified to not apply a guassian filter and to always upscale the parameter frequency
   - Changes to Altitude Radio Offset Removed from masking go-arounds
   - Changed Altitude AAL to use Alt Radio Offset Removed
   - Changed ascending Altitude band KPVs to use Combined Climb
   - Changed descending Altitude KPVs between 3000 and 1000 Ft to use slices_from_to as Approach excluded level flight
   - Flap Angle interleaves each of the signals and interpolates the resulting higher frequency resulting parameter - much more accurate than interpolating values before interleaving
   - G550 Speedbrake Selected Armed state from Speedbrake Armed parameter
   - Gear Up uses in transit for G-IV
   - second_window applies correct 2 / frequency check to support more use cases
   - slices_from_to function in library accepts threshold keyword argument to avoid triggering due to noise
   - Switched to Flap instead of Flap Including Transition for Landing Gear Out of Sequence Key Point Values as Including Transition does not model the lever during flap setting decreases
   - Touchdown refinements to cater for more difficult aircraft
   - Touchdown KTI now uses third detected point and includes extra braking features
   - Touchdown ignores positive acceleration and uses median to select actual touchdown point
   - Touchdown uses standard median function rather than the masked array version as we should not have any masked values
   - Truck and Trailer amended to accept floating point arguments
 - Added
   - A300 Altitude Radio overflow correction
   - A318 Speedbrake
   - Calculate new fallback datetime based on the "flat" timebase
   - Eng Oil Press For 20 Sec During Cruise Max Key Point Value to measure high oil pressure in cruise is an indication of clogging orifices in the oil supply lines to the aft sump
   - power_ceil function added to library to calculate the closest power of 2 greater than or equal to x


v0.17.2
-------

 - Fixed
   - Fixes to v2 and airspeed at liftoff kpvs to handle fully masked phases
   - Reverted FlapLever and Flaperon to step_values
   - Fix to HeadingVariationTouchdownPlus4SecTo60KtsAirspeed for straight
     landings
   - Altitude At Last Flap Change Before Touchdown amended to ignore automatic
     flap extension (Saab 2000 is a case in point)
   - Calculate angles: angle fix stops invalid offsets
   - Fix calculate_angle parameter offsets
 - Improved
   - Gross Weight Smoothed: Fall back to Gross Weight if no Fuel Flow
   - ILS Approach Flight Phase amended to ensure aircraft is facing the ILS
     localizer in order to become established
   - Heading Variation on landing altered to ignore final turnoff
   - Amended speedbrake selected for G450 to take into account speedbrake
     handle
   - Calculate_surface_angle: align to angle frequency
   - Renamed "Rate Of Turn" with "Heading Rate" globally
   - Thrust reverser change for Embraer legacy
 - Added
   - G450 speedbrake addition
   - New surface angle algorithm
 - Other
   - Updated numpy requirements as numpy.full is used


v0.17.1
-------

 - Improved
   - Add B747 to Speedbrake Selected
   - Derive Rudder from upper and lower (no middle)
   - Unit test improvements
   - Vibrations: use second_window instead of moving_average to improve short
     peak filtering
   - Acceleration Normal events refined to avoid overlap with liftoff and
     touchdown periods
   - repair_mask added to GearDownSelected
   - Gear Down Selection aligned to 1Hz to avoid problems with 767-3A frame
   - Engine oil pressure max KPV amended to only operate in flight.
   - Hysteresis modified to accept zero or None thresholds, and raise an
     exception for negative thresholds.
   - step_values: scan_fwd start rounded down to include first sample of
     transition array
   - index_at_value assertion added to check that endpoint argument is
     recognised
   - step_values used index_at_value with unrecognised endpoint argument
   - ILS Frequency derived parameter amended to allow for different frequencies
     being set

V0.16.1
-------

 - Fixed
   - Fix to climb acceleration start KTI
   - Fix to blend_parameters for low frequency parameters
   - Fix to AltitudeAtLastFlapChangeBeforeTouchdown to cater for auto flap
     retraction at touchdown
   - Changed AltitudeRadioCleanConfigurationMin to use Altitude AAL
 - Improved
   - Unit test improvements
   - Altitude Overshoot improved to use Level Flight
   - Change to slices_or to try to reduce running time
   - Touchdown algorithm extended to cater for Saab 3000 special case
   - Small slice duration parameter added to blend_parameters
   - Change to AltitudeAtLastFlapChangeBeforeTouchdown to avoid auto flap
     retraction at touchdown
   - Configuration: use aircraft tables values
 - Added
   - Touchdown specific to Saab 2000
   - Airspeed minus flap manoeuvre speed for 3 sec
   - Added GearDownToLandingFlapConfigurationDuration
   - Ldg gear out of sequence use Flap Including Trans
   - Added EGT/N2/N3 exceeded redline duration KPVs


V0.15.1
-------

 - Imprevements
   - Avoid issubclass calls taking 20% of runtime
   - Add A310 family to correction of overflow in Altitude Radio
   - AltitudeAtFlapExtensionWithGearDown and AirspeedAtFlapExtension now uses Gear Down Selected.
   - Process flight supports -R short for --required
   - find_low_alts: Support relative start and stop Relative to minimum dip
   - GoAroundAndClimbout: relative start and stop Changed to match flight phases document. 500ft before and 2000ft after.
   - Stable Approach threshold adjusted for A320 family EPR Aircraft
 - Fixes
   - Fix plotting where it does not open a window on show()
   - TCASRAReactionDelay: peak_curvature may return None
   - Magnetic variation repair amended
 - Added
   - Airspeed with flap selection (KPV)
   - Eng EPR exceeding Redline duration (KPV)
   - Eng N1 exceeding Redline duration (KPV)


V0.14.1
-------

 - Improvements
   - Engine Vibrations are averaged over 8 seconds to limit the effect of transient spikes.
   - library.second_window has an option to automatically extend the window if the window size is incompatible.
   - Eng Start and Eng Stop detection is more robust when the flight data is corrupted or incomplete.
   - Rejected Takeoff improved to detect less obvious instances.
   - Control Column/Wheel Force Key Point Values limited to the Airborne flight phase.
   - Segment boundaries during splitting are forced to be 4 seconds for ARINC 767 data.
   - Stable Approach algorithm detection improved by broadening the criteria and averaging engine power for 8 seconds.
   - Plotting parameters with matplotlib creates subgraphs when requested for more configurable data inspection.
   - Eng Hotel Mode flight phases require Propeller Brake.
   - Stall Warning Duration Key Point Value.
   - Overspeed Duration Key Point Value.
   - Airspeed Minus Airspeed Selected For 3 Sec Key Point Value.
   - Clip library function removed from codebase as it has been replaced by second_window.
 - Fixes
   - Turbulence RMS g renamed to Turbulence.
   - The Altitude STD signal is not smoothed twice.
   - Speedbrake Handle error fixed when only one of (L), (R) or (C) parameters are available.
   - Node type has been fixed to be stored correctly when creating derived parameters.

V0.13.3
-------

 - Imprevements
   - Turbulence RMSG can now operate at 1hz
   - Rate of Climb below 10,000ft amended to remove spurious values triggered on the ground
   - Rate of Climb below 10,000ft (CAA KPV) amended to provide a single KPV per flight.
   - Rate of Descent below 10,000 ft (CAA KPV) amended to provide single value per flight.
   - Fixed frequency issue with gear up also changed to using Gear Up Selected to improve accuracy at gear extention.
   - Stick Shaker KPVs not created for segments less than one second.
   - Engine Start and Stop now work with Eng (*) Ng where available. 
 - Fixes
   - Fixes to Gear parameters to correct Gear Retracting and prevent Gear Retracting
     and Gear Retracted phases overlapping
   - Split segments datetime correction logging
   - Correction to Takeoff Roll Or Rejected Takeoff phase
   - Groundspeed With Thrust Reversers Deployed Min to handle difference in frequencies


V0.13.2
-------

 - Imprevements
   - Fix to align now retains the data type of multistate parameter instead of forcing to int
   - changed speedbrake deployed to only use outboard spoilers
   - speedbrake fixes for ERJ-135 and Challenger 850
   - FlapAngle: Removed 787 combining slat
   - closest_unmasked_value: Always return 2 args
   - Handle Airspeed Selected being masked during t/off
   - consistent return type from step_values
 - KPVs Added
   - Airspeed Minus Flap Manoeuvre Speed For 3 Sec With Flap During Descent Min
   - Acceleration Lateral While Airborne Max


V0.13.1
-------

Flight Data Converter has been made timezone aware

 - Imprevements
   - Touchdown:
      - better handling when no clear normal acceleration in period tested
      - removed bias towards Gear On Ground
   - Taxiing: now takes into account rejected takeoffs
   - Libary slices: improved handling of floating point start and stops
   - Speedbrake Selected: Globals can process with eiter speedbrake or handle
   - ILS Localizer/Glideslope: added extra sources
   - V2 related nodes: Better handling of different frequencies encountered
   - Takeoff acceleration threshold increased to 0.15g to avoid enthusiastic 
       taxiing being identified as a takeoff start.
   - Moving Average function reworked to operate better with masked data.
   - Airspeed relative now includes V2 comparison during takeoff phase.
   - Flap Manoeuvre Speed: now includes values for Climb
   - Gear Down Selected: retain gear down mask
 - Derived Parameters Added;
   - Brake Temperature Min/Max/Avg.
   - Speedbrake Deployed (Multistate).
   - Gear Up (Multistate).
   - Gear In Transition (Multistate).
   - Altitude Radio Offset Removed.
   - Kinetic Energy
   - Potential Energy
   - Aircraft Energy
 - KPVs Added
   - Throttle Lever at Liftoff
   - Brake Temp During Taxi In Max
   - Brake Temp After Touchdown Delta
   - V2 At Liftoff
   - V2 Lookup At Liftoff
   - Airspeed Selected At Liftoff
   - Airspeed Selected FMC Minus Flap Manoeuvre Speed 1000 to 5000 Ft Min
   - Kinetic Energy At Runway Turnoff
   - Aircraft Energy When Descending
 - Phases Added:
   - Takeoff Roll Or Rejected Takeoff
 - Fixes:
   - Parameter renames:
     - Airspeed Selected (MCP)
     - AP VNAV
     - Thrust Mode Selected
 - Derived Parameters Removed;
   - V2
   - V2 Lookup


V0.12.4
-------

 - Added (KPV): Pitch35ToClimbAccelerationStartMax/Min
 - Added (KPV): airspeed minus V2 35 ft to climb acceleration start KVPs
 - Improvement: _value min/max/max abs values to better handle start and stop edges
 - Improvement: Speedbrake Selected - Check if Speedbrake Armed is available for Airbuses
 - Improvement: ClimbAccelerationStart multiple
   - AAL first dep for freq
   - Manually aligns parameters 
   - Fixed last freq divide
   - Support for analog spd_sel
   - Fix for low hz parameters
 - Fixed: AltitudeAAL bounced_sections alt comparison
 - Fixed: landing runway for parallel runways when ils established at start of approach
 - Fixed: most_common_value ignore negative values


V0.12.3
-------

 - ClimbAccelerationStart Throttle Lever and Np fallback, align to Altitude
   AAL.


V0.12.2
-------

 - ClimbAccelerationStart jet and prop alt fallbacks

V0.12.1
-------

 - Added ClimbAccelerationStart KTI
 - Optimisation: Replaced interp1d
 - Added Airspeed Selected blending parameter
 - library: Added power_floor function
 - Fixes for RejectedTakeoff
 - `copy` option for moving_average
 - Changed AirspeedMinusV2 to use Airspeed Selected
 - APVerticalMode: AT Active & Climb Mode Active
 - process_flight(): save the start_datetime to the HDF5
 - step_values: Improved mask handling
 - slices_from_to: trigger on dips and peaks
 - SpeedbrakeSelected: 757+767 handle algo changed
 - Don't break on time base errors, pass it back for the segments to be created
   in a database
 - Handle index == len(array) in closest_unmasked_val
 - Floor closest_unmasked_index values
 - Fix to takeoff following recent change

V0.11.3
-------
 - Fix to closest_unmasked_index to resolve problems with low frequency and
   high offset parameters creating KPV's ouside of segment slice.

v0.11.1
-------
 - Splitting algorithm improved to not split flights based on insignificant
   sections of high airspeed.
 - Detection of turning onto the runway improved to handle invalid data.
 - Derived Fuel Qty parameter now includes Fuel Qty (Tail) in aggregation.
 - Speedbrake parameter improved to support Global and G-IV aircraft families.
 - Speedbrake Selected parameter improved to support G-IV aircraft family.
 - blend_two_parameters amended to return a result of the correct sample rate
   if one parameter is faulty.
 - Flap and Flap Lever algorithm improved to handle masked sections of data
   between flap changes.
 - closest_unmasked_value rewritten to provide more consistent results.
 - Repairing sections of invalid data has been improved to support fill_start
   and fill_stop methods along with the default of interpolation.
 - ILS established below 0.8 dots to avoid transient events as the localizer
   falls below the event threshold.


v0.10.1
------
 - Change to magnetic variation from runway as magnetic variation should be
   difference from magnetic to true heading
 - fixed EngTorquePercent65KtsTo35FtMin
 - Fixed Eng Stop detection through interpolation
 - Renamed Selected Speed to Airspeed Selected following standardisation of
   parameter name
 - JSON tools: convert Nodes to and from JSON
 - KML: Improved coordinate param fallback code
 - Added local API logging to find file paths
 - Changes to accommodate aircraft with only Latitude (Coarse) and Longitude
   (Coarse) recorded.
 - fix to heading_diff to correct sign of returned value when not passing 0
 - KML: Altitude STD used in preference to AAL
 - KML: Fixed altitude param fallback
 - process_flight: Added verbose option
 - KML: Allow altitude parameter fallback.
 - process_flight: Fixed series and family args
 - Trap for rare error condition in Altitude AAL
 - Fixed derived parameter creation in kml writing
 - Write KML with any lat and lon, improved arguments
 - FlapManoeuvreSpeed: Fix for missing manufacturer attribute
 - Fixed test cases broken by assert_masked_array_almost_equal

v0.9.1
------
 - Fixed Fuel Qty parameter names (L and R)
 - Added FuelQtyWingDifferenceMax derived parameter
 - Takeoff5MinRating now usesTakeoffAccelerationStart
 - Amendment to _qnh_adjust to allow for the fact that the climb and descent
   phases don't start and end at the airfield
 - Fast section does not extrapolate, improved tests
 - FlapLeverSynthetic dependencies reflect mapping
 - Altitude smoothing added for Beech 1900D
 - Changed level_off_index to not bail after first masked data
 - Changed EngGasTempDuringEngStartMax search to 5 mins
 - ZeroFuelWeight changed to derived parameter
 - Align parameters used by APChannelsEngaged
 - Support case when input data is masked
 - Align the AP Engaged arguments
 - Added moving_average to AltitudeSTDSmoothed
 - Fix: V-Vapp wasn't following changing Vapp signal Invalid test case for
   superframe Vapp removed - not seen in LFLs
 - level_off_index will round up sample window sizes.
 - Fix for LastEngStop outside of data.
 - Fixed overflow_correction max_val in a320 test
 - find_toc_tod improved to use frequency in creating the slope


v0.8.1
------
 - fix for APVerticalMode where only flare mode is avaliable
 - added check for valid ils localiser data within approach for ils established
   flight phase
 - improvements to Altitude Radio overflow correction
 - optimisations in second_window()
 - global replacement of assert_almost_equal with
   assert_masked_array_almost_equal in library test and derived parameters
 - added missing "Eng (*) Fuel Flow Max"
 - added B777 Speedbrake Selected algorithm
 - EngStart and EngStop improved to ignore small power dips
 - rudder added as Derived Parameter, based on the three parts of a 777 rudder
 - fuel quantity data is repaired and gaps are smoothed over to create a more
   realistic reading than that of the recorded


v0.7.1
------
 - Velocity Speed Parameters and KPV's reworked
 - Improvements to detection of approaches starting below 3000ft
 - Improvements to TaxiOut, TaxiIn and Taxiing, now only includes before and after Eng Starts and Stop
 - Support for ERJ-170/175 & 190/195 Aircraft Families
 - Support for G-IV Aircraft Families
 - Support for Phemom 300 Aircraft Families
 - Library change - slices_remove_small_gaps now handles slices with None start or stop entries.
 - Library: added new function first_available_parameter()
 - Library: update function first_valid_parameter()
 - Added: AirspeedMinsToTouchdown
 - Added: APU On During Flight Duration
 - Added: DestinationAirport FlightAttributeNode
 - Added: derive parameters and kpvs for aircraft who record torque in percent
 - Added: check to Approach Range to check for valid glideslope data within the regression slice
 - Fix: Compasses initialised either side of North lead to 180deg error
 - Docs: Circular dependency updated
 - Docs: Dependency tree docs update
 - Docs: Autopilot documentation updated


v0.6.5
------
 - Force frequency and offset in GrossWeight to avoid interpolation error

v0.6.4
------
 - Airbus sidestick threshold increased to accommodate aircraft with one bit offsets on the inactive stick.
 - Pilot Flying identification by means of VHF usage removed

v0.6.3
-----
 - Fix to allow takeoff sections to start at the beginning of the data.

v0.6.2
------
 - Fix to flight number determination to ignore zero values.
 - Check for valid glideslope data within regression slice for approach range.

v0.6.1
------
 - Thrust Asymmetry now supports EPR asymmetry as a percentage value.
 - Split Segments splits the average of the normalised engine params (and Groundspeed)
   rather than the minimum of any of the individual params to fix early splits on 
   single engine taxi in.


v0.5.2
------
 - Flap nodes which ignore 'Lever 0' state use string states rather than raw vals
 - TAWS Windshear detects climb as well as approach
 - Alpha floor only detect while Airborne
 - AP Engaged / Disengaged widened phase to Fast rather than Airborne
 - Takeoff and Landing Pilot identification fix for Pilot Flying parameter 
   (currently on Airbus with sidesticks)
 - air_track for fitting lat/long smoothed tracks improved for long distances
 - Approach Range improved for Visual Approaches (no valid Glideslope) for 
   approaches to airports with ILS installed
 - RTO ensures liftoff occurs within 30secs of potential RTO
 - Force Lat/Long to 1Hz for those with lower sample rates


v0.5.1
------

Improvements:
 - Units all use constants defined in FlightDataUtilities repository
 - Headwind improvement to use Airspeed as first dependency to increase hz
 - Pilot Flying (currently for Airbus Sidestick) added for Flight Attributes 
   Takeoff Pilot and Landing Pilot.
 - Split Segments fix for DFC splits where incorrect engine split index was used
 - Gear Extending/Retracting use Gear Selected rather than Red Warnings directly
 - air_track accounts for airspeed calibration errors on really bad aircraft
 - Takeoff and Landing Roll work when no Pitch parameter available (yes, some 
   really bad aircraft!)
 - Groundspeed established from Longitudinal Acceleration within Groundspeed 
   During RTO Max
 - TAWS Alert can_operate method fix
 - Invalidate "Year" parameter before calculate timebase so we use the 
   fallback_dt.year in its place.
 - create_kpvs_within_slices fix to rounding of start and stop edges
 - Improved smoothing of Heading and Altitude for Hercules aircraft
 - bearings_and_distances library routine improved for earth curvature
 - Multiple Go Around KPV improvements
 
Nodes added:
 - "Master Caution" merges multiple signals
 - "Pitch Above 1000 Ft Min" and "Pitch Above 1000 Ft Max"

Nodes removed:
 - Removed "Altitude STD At Lifoff" and "Altitude STD At Touchdown" KPVs
 - Removed "Configuration At Landing" KPV as we rely upon "Flap At Touchdown"
 
 
v0.4.1
------
 - A319, A320, A321 support - Flap Lever (Synthetic), Configuration and Speedbrake
 
Improvements:
 - climb flight phase added to Height Loss KPVs
 - AOA works from just one signal rather than relying on both (A) and (B)
 - Nodes support setting of aliases "hz" and "sample_rate" in place of frequency
 - Overflow correction fix 0.0 now does nothing rather than mask
 - TCAS RA uses recorded TCAS RA parameter (on Airbus) in preference to 
   TCAS Combined Control (on Boeings)
 - Altitude correction for CRJ Alitiude Radio
 - Improve overflow correction for Altitude Radio
 - Split Segments supports GROUND_ONLY when no movement determined on ground
   based upon Heading.
 - FlapAtTouchdown KPVs all use the Flap Angle rather than the Flap Lever
 - process_flight supports stripping of hdf5 derived parameters for reprocessing
 - _value library now returns states (assumes order by that of raw value)
 - Master Warning inhibited when engines not running
 - ILS Established works better with low sample rate data and makes sure the 
   aircraft path converges onto the beam and does not just pass through.
 - Flight Phase "Bottom Of Descent" revised to be more robust
 - Gross Weight at Liftoff and touchdown - catch repair errors where no valid data


v0.3.2
------

 - Fix to thrust_reversers_working indexing (including refactor of 
   clump_multistate)


v0.3.1
------
 - Flap Angle supports more than two signals, including (C) and (MCP) channels
 - Improvements to Top Of Climb (find_toc_tod) and Bottom of Descent (uses just 
   ClimbCruiseDescent) make climbs and descents more robust.
 - ILS Frequency only reports valid frequency if both (1) and (2) channels are 
   recording same frequency.
 - Airspeed with Flap 0 and Slat something.
 - Support for Slat included in Flap Lever (Synthetic) to ensure slat only 
   transitions are included.


v0.2.2
------
 - Fix to nodes to calculate a new offset when aligning to a higher frequency
   to ensure offset does not exceed the time of the first sample


v0.2.1
------
 - Added analyzer profiles
 - Support for CL-600 Aircraft Families
 - Support for A340 Aircraft Families
 - Support for BD-100 Aircraft Families
 - Speedbrake refactoring
 - Added Airbus KPV's
 - Support for ground runs
 - Support for slat stepping
 - Clip replaced with second_window
  - Improves speed
  - Corrects truncation of adjacent peaks

  
v0.1.1
------

 - Numerous improvements


v0.0.6
-----

 - Support for Beechcraft 1900D.
 - Improved liftoff detection algorithm.


v0.0.2
-----

 - Support for B757 / B767.


v0.0.1
------

 - Initial release directed at B737.