A-79-105
NTSB Safety Recommendation — Aviation
Recommendation text
THE NTSB RECOMMENDS THAT THE FEDERAL AVIATION ADMINISTRATION: REVISE OPERATIONAL PROCEDURES AND INSTRUMENTATION TO INCREASE STALL MARGIN DURING SECONDARY EMERGENCIES BY: (A) EVALUATING THE TAKEOFF-CLIMB AIRSPEED SCHEDULES PRESCRIBED FOR AN ENGINE FAILURE TO DETERMINE WHETHER A CONTINUED CLIMB AT SPEEDS ATTAINED IN EXCESS OF V2, UP TO V2 + 10 KNOTS, IS AN ACCEPTABLE MEANS OF INCREASING STALL MARGIN WITHOUT SIGNIFICANTLY DEGRADING OBSTACLE CLEARANCE. (B) AMENDING APPLICABLE REGULATIONS AND APPROVED FLIGHT MANUALS TO PRESCRIBE OPTIMUM TAKEOFF-CLIMB AIRSPEED SCHEDULES; AND (C) EVALUATING AND MODIFYING AS NECESSARY THE LOGIC OF FLIGHT DIRECTOR SYSTEMS TO INSURE THAT PITCH COMMANDS IN THE TAKEOFF AND GO-AROUND MODES CORRESPOND TO OPTIMUM AIRSPEED SCHEDULES AS DETERMINED BY (A) AND (B) ABOVE.
In plain language (FlightFinder summary)
The Federal Aviation Administration is asked to revise procedures and instrumentation to increase stall margin during secondary emergencies. This includes evaluating takeoff-climb airspeed schedules for engine failure to see if climbing at speeds between V2 and V2+10 knots improves stall margin without affecting obstacle clearance; amending regulations and flight manuals to specify optimal schedules; and adjusting flight director system logic to match those schedules.
This plain-language summary is written by FlightFinder to explain the recommendation above. It is not the official wording — the verbatim NTSB text is quoted above.
Details
| Status | Closed - Acceptable Action |
|---|---|
| Mode | Aviation |
| Closed | May 17, 1983 |
| NTSB number | DCA79AA017 |
| Addressees | FAA |
External links
NTSB safety recommendations are advisory; addressees are not legally required to adopt them. Source: NTSB CAROL (public domain).