NTS Board Recommended Improved Black Boxes on Wednesday

From:         Stephen L Nicoud <stephen.nicoud@boeing.com>
Date:         03 Mar 95 13:48:52 
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I found in Monday's (February 27, 1995) Aviation Daily the following
article which identifies the proposed parameters to be recorded by FDRs:

NTSB Urges Flight Data Recorder Upgrades For Newly Manufactured Aircraft

Along with recommendations for upgrading flight data recorders on aircraft
in service, the National Transportation Safety Board issued a list of
proposed parameters for FDRs on newly manufactured (DAILY, Feb. 23).  The
proposed FDR enhancements are recommended for aircraft operated under
Parts 121, 125 and 135 (10 seats or larger) and certificated after Dec. 31,
1996. The board also urged that the FDRs have a 25-hour recording
capacity.

        Proposed FDR Enhancements For Newly Manufactured Airplanes

 Acceleration Parameters:
     Vertical
     Lateral
     Longitudinal
 Airplane Performance/Position Parameters:
     Altitude
     Airspeed
     Air/Ground sensor (primary airplane systems reference, nose or main
        gear) 
     Brake pressure and pedal position
     Drift angle (when an information source is installed)
     Ground speed (when an information source is installed)
     Wind speed and direction (when an information source is installed)
     Outside air temperature or total air temperature
     Radio altitude (when an information source is installed)
     Latitude and longitude (when an information source is installed)
 Airplane Attitude Parameters:
     Angle of attack left and right (when an information source is
        installed) 
     Pitch
     Roll
     Magnetic heading
     True heading (when an information source is installed, sampled 1
        per 4 seconds) 
     Yaw or sideslip angle (when an information source is installed)*
   Flight Controls Position and Input Parameters:
     All control surface positions - primary controls (pitch, roll, and yaw)
     All cockpit flight control input positions (control wheel, control
        column, rudder pedal) (sidestick controllers on fly-by-wire systems)
     All trim surface positions - primary controls** (pitch, roll, and yaw)
     All cockpit trim control input positions - primary controls**
        (pitch, roll, and yaw) 
     Thrust/power - primary flightcrew reference (may require multiple
        parameters for all phases of flight) 
     Throttle/power lever position
     Thrust reverser status (i.e., stow, transit, deployed, reverse pitch)
     Thrust command (when an information source is installed)
     Thrust target (when an information source is installed)
     Engine bleed valve position (when an information source is installed)
 Airplane Configuration Parameters:
     Flap position (trailing and leading edge)
     Spoiler position (ground and speed brake)
     Spoiler/speed brake cockpit selection/status (armed-ground spoiler)
     Flap cockpit control selection
     Landing gear position
     Landing gear cockpit control selection
     De-icing and anti-icing system selection (when an information source
        is installed, sampled 1 per 4 seconds)
     Fuel quantity in CG trim tank (when an information source is
        installed) 
     Computed center of gravity (when an information source is installed)
     AC electrical bus status
     DC electrical bus status
     APU bleed valve position
     Hydraulic pressure (all systems)
 Navigation Aids:
     Localizer deviation
     Glideslope deviation
     DME 1 and 2 distances
     NAV 1 and 2 selected frequency
     GPS position data (when an information source is installed)
     Marker beacon passage
 Autopilot Parameters:
     Engagement status (all systems)
     AFCS modes and engagement status
 Timing:
     Radio transmitter keying
     UCT (when an information source is installed)
     Recorder elapsed time (frame counter, 0 to 4,095)
     CVR/DFDR synchronization reference (when an information source is
        installed) 
     Event marker
 Warning Parameters:
     GPWS
     Hydraulic pressure low (each system)
     Master warning
     Loss of cabin pressure
     TCAS - TA, RA, and sensitivity (as selected by crew)
     Icing (when an information source is installed)
     Engine warnings each engine -
          Vibration (when an information source is installed)
          Over temp. (when an information source is installed)
          Oil pressure low (when an information source is installed)
          Over speed (when an information source is installed)
     Windshear (when an information source is installed)
     Computer failure
     Stick shaker/pusher (when an information source is installed)
 Manual/Automatic Selected Parameters:
     Selected barometric setting
     Selected speed
     Selected vertical speed
     Selected heading
     Selected flight path
     Selected decision height
     EFIS display format
     Head-up display (when an information source is installed)
     Para-visual display (when an information source is installed)
     Multi-function/engine/alerts display format

  * Range, as installed; accuracy, as installed; resolution, 0.3% of
       full range; sampling, 1 per second.
 ** Range, full travel, accuracy, 1 3% unless higher accuracy uniquely
       required; resolution, 0.3% of full range; sampling, 1 per second.

 Notes:
 1.  Data shall be recorded within the range, resolution, accuracy and
     sampling intervals specified in EUROCAE Document ED-55, Chapter 3 and
     Annex 1, unless otherwise noted.
 2.  Each airplane type will need to be assessed to identify any novel or
     unique design or operational characteristics.  It will then be
     necessary to ensure that sufficient dedicated parameters, appropriate
     to these characteristics, are recorded in addition to or in place of
     other parameters.
 3.  The flight recorder shall use a digital method of recording and
     storing the data and a method of readily retrieving those data from
     the storage medium.  The data shall be obtained from sources within
     the aircraft that enable accurate correlation with data displayed to
     the flightcrew, except when the flight deck displays are filtered or
     manipulated so as to produce values that do not meet the resolution
     and accuracy requirements for all phases of flight (for example,
     some EICAS flight control position display data).
   Source:  NTSB


--
Stephen L Nicoud  <Stephen.Nicoud@Boeing.Com>
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