14 CFR Part 135, Appendix C to Part 135 - Helicopter Flight Recorder Specifications

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View PDF at GPO Pt. 135, App. C
Appendix C to Part 135—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 December 6, 2010, the sampling interval per second is 4.
Relative time (from recorded on prior to takeoff) 25 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 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/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. 25530, 53 FR 26152, July 11, 1988; 53 FR 30906, Aug. 16, 1988, as amended by Amdt. 135-69, 62 FR 38397, July 17, 1997; Amdt. 135-113, 73 FR 12570, Mar. 7, 2008; 73 FR 15281, Mar. 21, 2008; Amdt. 135-121, 75 FR 17047, 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.

  • 2014-11-03; vol. 79 # 212 - Monday, November 3, 2014
    1. 79 FR 65139 - Departing IFR/VFR When Weather Reporting Is Not Available; Confirmation of Effective Date
      GPO FDSys XML | Text
      DEPARTMENT OF TRANSPORTATION, Federal Aviation Administration
      Direct final rule; confirmation of effective date.
      The direct final rule published July 28, 2014 (79 FR 43619) will become effective on April 22, 2015.
      14 CFR Part 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 135 after this date.

  • 2014-11-03; vol. 79 # 212 - Monday, November 3, 2014
    1. 79 FR 65139 - Departing IFR/VFR When Weather Reporting Is Not Available; Confirmation of Effective Date
      GPO FDSys XML | Text
      DEPARTMENT OF TRANSPORTATION, Federal Aviation Administration
      Direct final rule; confirmation of effective date.
      The direct final rule published July 28, 2014 (79 FR 43619) will become effective on April 22, 2015.
      14 CFR Part 135