A-90-182
NTSB Safety Recommendation — Aviation
Recommendation text
TO THE FEDERAL AVIATION ADMINISTRATION: Conduct a directed safety investigation of all Garrett tpe-331 engine powered turbopropeller airplanes. This investigation should evaluate the potential for in flight use of the beta mode, and the effects of incorrectly adjusting the blade pitch angle of the propeller during maintenance activities and, following the directed safety investigation, take appropriate action to preclude in-flight beta operation on airplanes not approved for such operation. (Superseded by A-94-61, A-94-62, and A-94-63)
In plain language (FlightFinder summary)
The Federal Aviation Administration is asked to conduct a directed safety investigation of all Garrett TPE-331 engine powered turbopropeller airplanes. The investigation must assess the potential for in-flight beta mode use and the effects of incorrect propeller blade pitch adjustment during maintenance, then take action to prevent in-flight beta operation on airplanes not approved for it. (This recommendation has been superseded by A-94-61, A-94-62, and A-94-63.)
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| Status | Closed - Acceptable Action/Superseded |
|---|---|
| Mode | Aviation |
| Closed | Mar 2, 1994 |
| NTSB number | 79620 |
| Addressees | FAA |
External links
NTSB safety recommendations are advisory; addressees are not legally required to adopt them. Source: NTSB CAROL (public domain).