14 CFR Appendix E to Part 135, Helicopter Flight Recorder Specifications

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Appendix E to Part 135 - Helicopter Flight Recorder Specifications
Parameters Range Accuracy sensor input to DFDR readout Sampling interval (per second) Resolution 2 read out
Time (GMT) 24 Hrs ±0.125% Per Hour 0.25 (1 per 4 seconds) 1 sec
Altitude −1,000 ft to max certificated altitude of aircraft ±100 to ±700 ft (See Table 1, TSO-C51a) 1 5′ to 30′.
Airspeed As the installed measuring system ±3% 1 1 kt
Heading 360° ±2° 1 0.5°.
Normal Acceleration (Vertical) −3g to 6g ±1% of max range excluding datum error of ±5% 8 0.01g
Pitch Attitude ±75° ±2° 2 0.5°
Roll Attitude ±180° ±2° 2 0.5°.
Radio Transmitter Keying On-Off (Discrete) 1 0.25 sec
Power in Each Engine: Free Power Turbine Speed and Engine Torque 0-130% (power Turbine Speed) Full range (Torque) ±2% 1 speed 1 torque (per engine) 0.2% 1 to 0.4% 1
Main Rotor Speed 0-130% ±2% 2 0.3% 1
Altitude Rate ±6,000 ft/min As installed 2 0.2% 1
Pilot Input - Primary Controls (Collective, Longitudinal Cyclic, Lateral Cyclic, Pedal) 3 Full range ±3% 2 0.5% 1
Flight Control Hydraulic Pressure Low Discrete, each circuit 1
Flight Control Hydraulic Pressure Selector Switch Position, 1st and 2nd stage Discrete 1
AFCS Mode and Engagement Status Discrete (5 bits necessary) 1
Stability Augmentation System Engage Discrete 1
SAS Fault Status Discrete 0.25
Main Gearbox Temperature Low As installed As installed 0.25 0.5% 1
Main Gearbox Temperature High As installed As installed 0.5 0.5% 1
Controllable Stabilator Position Full Range ±3% 2 0.4% 1.
Longitudinal Acceleration ±1g ±1.5% max range excluding datum error of ±5% 4 0.01g.
Lateral Acceleration ±1g ±1.5% max range excluding datum of ±5% 4 0.01g.
Master Warning Discrete 1
Nav 1 and 2 Frequency Selection Full range As installed 0.25
Outside Air Temperature −50 °C to 90 °C ±2° c 0.5 0.3° c

1 Per cent of full range.

2 This column applies to aircraft manufactured after October 11, 1991.

3 For all aircraft manufactured on or after December 6, 2010, the sampling interval per second is 4.

[Doc. No. 25530, 53 FR 26154, July 11, 1988; 53 FR 30906, Aug. 16, 1988; Amdt. 135-113, 73 FR 12571, Mar. 7, 2008; 73 FR 15281, Mar. 21, 2008; Amdt. 135-121, 75 FR 17047, Apr. 5, 2010]

Title 14 published on 2015-11-17

The following are ALL rules, proposed rules, and notices (chronologically) published in the Federal Register relating to 14 CFR Part 135 after this date.

  • 2017-02-08; vol. 82 # 25 - Wednesday, February 8, 2017
    1. 82 FR 9677 - Revisions to Operational Requirements for the Use of Enhanced Flight Vision Systems (EFVS) and to Pilot Compartment View Requirements for Vision Systems
      GPO FDSys XML | Text
      DEPARTMENT OF TRANSPORTATION, Federal Aviation Administration
      Final rule; delay of effective date.
      The effective date of the rule amending 14 CFR parts 1, 23, 25, 27, 29, 61, 91, 121, 125, and 135 published at 81 FR 90126, December 13, 2016, is delayed until March 21, 2017, except for the amendments to §§ 61.66 (amendatory instruction no. 15), 91.175 (amendatory instruction no. 18), 91.1039 (amendatory instruction no. 23), 121.651 (amendatory instruction no. 27), 125.325 (amendatory instruction no. 33), 125.381 (amendatory instruction no. 35), and 135.225 (amendatory instruction no. 38), which are effective March 13, 2018.
      14 CFR Parts 1, 23, 25, 27, 29, 61, 91, 121, 125, and 135

Title 14 published on 2015-11-17.

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.

  • 2017-02-08; vol. 82 # 25 - Wednesday, February 8, 2017
    1. 82 FR 9677 - Revisions to Operational Requirements for the Use of Enhanced Flight Vision Systems (EFVS) and to Pilot Compartment View Requirements for Vision Systems
      GPO FDSys: XML | Text
      DEPARTMENT OF TRANSPORTATION, Federal Aviation Administration
      Final rule; delay of effective date.
      The effective date of the rule amending 14 CFR parts 1, 23, 25, 27, 29, 61, 91, 121, 125, and 135 published at 81 FR 90126, December 13, 2016, is delayed until March 21, 2017, except for the amendments to §§ 61.66 (amendatory instruction no. 15), 91.175 (amendatory instruction no. 18), 91.1039 (amendatory instruction no. 23), 121.651 (amendatory instruction no. 27), 125.325 (amendatory instruction no. 33), 125.381 (amendatory instruction no. 35), and 135.225 (amendatory instruction no. 38), which are effective March 13, 2018.
      14 CFR Parts 1, 23, 25, 27, 29, 61, 91, 121, 125, and 135