FAA Test Hazard Analysis

FAR No.:

23.904

FAR Title:

Automatic Power Reserve (APR) System

Risk Level:

High

Maneuver Title:

V1 cut Takeoff

Maneuver Description:

See FAR Part 23 Appendix H for details:

Critical Time Interval. When conducting an APR takeoff, the critical time interval is that period starting at V1 minus one second and ending at the intersection of the engine and APR failure flight path line with the minimum performance all engine flight path line. The engine and APR failure flight path line intersects the one-engine-inoperative flight path line at 400 feet above the takeoff surface. The engine and APR failure flight path is based on the airplane'

Hazard:

Loss of directional control on runway

Cause(s):

1. 1. Insufficient control power to maintain directional control on runway
2. APR fails to operate

Mitigation(s):

1.1 1. Power reduction speeds to be always greater than Vmcg
2. Perform tests in order of decreasing performance capability
3. Check APR status just prior to Brake Release.


Warning: It is imperative that this information be applied by a knowledgeable flight test professional given the inherently hazardous nature of these activities. This data is general and all items may not apply. Application may require additional research to understanding the safe approach and mitigation sequence for a specific flight test situation.

* FAA Note: The maneuver information described in this database is for reference only. Consult Title 14 CFR for actual FAR requirements.