A-76-097
NTSB Safety Recommendation — Aviation
Recommendation text
AMEND 14 CFR 23.149 TO REQUIRE THAT A SAFE ONE-ENGINE INOPERATIVE SPEED (VSSE) BE SPECIFIED. THIS SPEED SHOULD BE SUFFICIENTLY ABOVE THE MINIMUM CONTROL AND SINGLE-ENGINE STALL SPEEDS THAT THERE WILL BE NO UNCONTROLLABLE YAW OR ROLL RATE WHEN THRUST IS SUDDENLY REDUCED TO IDLE ON THE CRITICAL ENGINE WITH TAKEOFF OR MAXIMUM AVAILABLE POWER ON THE OPERABLE ENGINE. THIS SPEED SHOULD BE DEMONSTRATED UNDER THE MOST ADVERSE CONDITIONS -- GROSS WEIGHT, C.G., ALTITUDES, AND TEMPERATURE -- WITHIN THE AIRPLANE'S OPERATING ENVELOPE.
In plain language (FlightFinder summary)
The FAA is asked to establish a specific speed requirement for two-engine aircraft that ensures pilots can maintain control if one engine fails during takeoff. This speed must be high enough to prevent the plane from spinning or rolling uncontrollably when power is lost on one side, even under the heaviest weight and most challenging weather conditions the aircraft is designed to handle.
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 Alternate Action |
|---|---|
| Mode | Aviation |
| Closed | Sep 22, 1987 |
| NTSB number | LAX76AL047 |
| Addressees | FAA |
External links
NTSB safety recommendations are advisory; addressees are not legally required to adopt them. Source: NTSB CAROL (public domain).