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14 CFR 91, Appendix F to Part 91 - Helicopter Flight Recorder Specifications

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Pt. 91, App. F
Appendix F to Part 91—Helicopter Flight Recorder Specifications
Parameters Range Installed system 1 minimum accuracy (to recovered data) Sampling interval (per second) Resolution 3 read out
Relative Time (From Recorded on Prior to Takeoff) 4 hr minimum ±0.125% per hour 1 1 sec.
Indicated Airspeed VM in to VD (KIAS) (minimum airspeed signal attainable with installed pilot-static system) ±5% or ±10 kts., whichever is greater 1 1 kt.
Altitude −1,000 ft. to 20,000 ft. pressure altitude ±100 to ±700 ft. (see Table 1, TSO C51-a) 1 25 to 150 ft.
Magnetic Heading 360° ±5° 1
Vertical Acceleration −3g to 6g ±0.2g in addition to ±0.3g maximum datum 4 (or 1 per second where peaks, ref. to 1g are recorded) 0.05g.
Longitudinal Acceleration ±1.0g ±1.5% max. range excluding datum error of ±5% 2 0.03g.
Pitch Attitude 100% of usable range ±2° 1 0.8°
Roll Attitude ±60 or 100% of usable range, whichever is greater ±2° 1 0.8°
Altitude Rate ±8,000 fpm ±10% Resolution 250 fpm below 12,000 ft. indicated 1 250 fpm below 12,000.
Engine Power, Each Engine
Code of Federal Regulations - Page 831
Main Rotor Speed Maximum Range ±5% 1 1%2.
Free or Power Turbine Maximum Range ±5% 1 1%2.
Engine Torque Maximum Range ±5% 1 1%2.
Flight Control Hydraulic Pressure
Primary (Discrete) High/Low 1
Secondary—if applicable (Discrete) High/Low 1
Radio Transmitter Keying (Discrete) On/Off 1
Autopilot Engaged (Discrete) Engaged or Disengaged 1
SAS Status-Engaged (Discrete) Engaged or Disengaged 1
SAS Fault Status (Discrete) Fault/OK 1
Flight Controls
Collective 4 Full range ±3% 2 1%2.
Pedal Position 4 Full range ±3% 2 1%2.
Lat. Cyclic 4 Full range ±3% 2 1%2.
Long. Cyclic 4 Full range ±3% 2 1%2.
Controllable Stabilator Position 4 Full range ±3% 2 1%2.
1 When data sources are aircraft instruments (except altimeters) of acceptable quality to fly the aircraft the recording system excluding these sensors (but including all other characteristics of the recording system) shall contribute no more than half of the values in this column.
2 Per cent of full range.
3 This column applies to aircraft manufactured after October 11, 1991.
4 For all aircraft manufactured on or after April 6, 2012, the sampling interval per second is 4.
[Doc. No. 18334, 54 FR 34328, Aug. 18, 1989; 54 FR 41211, Oct. 5, 1989; 54 FR 53036, Dec. 26, 1989; Amdt. 91-300, 73 FR 12565, Mar. 7, 2008; 73 FR 15280, Mar. 21, 2008; Amdt. 91-313, 75 FR 17046, Apr. 5, 2010]

Title 14 published on 2012-01-01

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For a complete list of all Rules, Proposed Rules, and Notices view the Rulemaking tab.

  • 2012-12-06; vol. 77 # 235 - Thursday, December 6, 2012
    1. 77 FR 72709 - Prohibition Against Certain Flights Within the Territory and Airspace of Iraq
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      DEPARTMENT OF TRANSPORTATION, Federal Aviation Administration
      Final rule.
      This action is effective January 7, 2013.
      14 CFR Part 91

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Title 14 published on 2012-01-01

The following are ALL rules, proposed rules, and notices (chronologically) published in the Federal Register relating to 14 CFR 91 after this date.

  • 2013-03-28; vol. 78 # 60 - Thursday, March 28, 2013
    1. 78 FR 18932 - Public Meeting: Unmanned Aircraft Systems Test Site Program; Privacy Approach
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      DEPARTMENT OF TRANSPORTATION, Federal Aviation Administration
      Notice of public engagement session.
      The session will be held via teleconference on Wednesday, April 3, 2013, beginning at 12 noon Eastern Daylight Savings Time and ending no later than 2 p.m. Eastern Daylight Savings Time.
      14 CFR Part 91