View all text of Subpart C [§ 194.301 - § 194.313]
§ 194.312 - Powered-lift in vertical-lift flight mode, flight recorder specifications under part 135 of this chapter.
Table 1 to § 194.312
| Parameters | Range | Installed system
1 minimum
accuracy (to recovered data) | Sampling interval (per second) | Resolution read out | Relative time (from recorded on prior to takeoff) | 25 hr minimum | ±0.125% per hour | 1 | 1 sec. | Indicated airspeed | V | ±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. | 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 | 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 | Primary Controls (I.E. Ascent, descent, acceleration, and deceleration, heading and directional control for all axis) 3 | Full range | ±3% | 2 | 1%. 2 | Controllable Stabilator Position 3 | Full range | ±3% | 2 | 1%. 2 |
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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 Percent of full range.
3 For all aircraft manufactured on or after December 6, 2010, the sampling interval per second is 4.