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

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There are 2 Updates appearing in the Federal Register for 14 CFR 91. View below or at eCFR (GPOAccess)
View PDF at GPO 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
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.
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
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.
[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 2014-01-01

The following are only the Rules published in the Federal Register after the published date of Title 14.

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

  • 2014-02-21; vol. 79 # 35 - Friday, February 21, 2014
    1. 79 FR 9932 - Helicopter Air Ambulance, Commercial Helicopter, and Part 91 Helicopter Operations
      GPO FDSys XML | Text
      DEPARTMENT OF TRANSPORTATION, Federal Aviation Administration
      Final rule.
      This rule is effective April 22, 2014. Affected parties, however, do not have to comply with the information collection requirements in §§ 120.105(i), 120.215(a)(9), 135.615, 135.617, 135.619, and 135.621 until the Office of Management and Budget (OMB) approves the collection and assigns a control number under the Paperwork Reduction Act of 1995. The FAA will publish in the Federal Register a notice of the control number assigned by OMB for these information collection requirements. The incorporation by reference of certain publications listed in §§ 135.168 and 135.605 is approved by the Director of the Federal Register as of April 22, 2014.
      14 CFR Parts 91, 120, and 135

Title 14 published on 2014-01-01

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

  • 2014-02-21; vol. 79 # 35 - Friday, February 21, 2014
    1. 79 FR 9932 - Helicopter Air Ambulance, Commercial Helicopter, and Part 91 Helicopter Operations
      GPO FDSys XML | Text
      DEPARTMENT OF TRANSPORTATION, Federal Aviation Administration
      Final rule.
      This rule is effective April 22, 2014. Affected parties, however, do not have to comply with the information collection requirements in §§ 120.105(i), 120.215(a)(9), 135.615, 135.617, 135.619, and 135.621 until the Office of Management and Budget (OMB) approves the collection and assigns a control number under the Paperwork Reduction Act of 1995. The FAA will publish in the Federal Register a notice of the control number assigned by OMB for these information collection requirements. The incorporation by reference of certain publications listed in §§ 135.168 and 135.605 is approved by the Director of the Federal Register as of April 22, 2014.
      14 CFR Parts 91, 120, and 135