A-92-119
NTSB Safety Recommendation — Aviation
Recommendation text
THE NTSB RECOMMENDS THAT THE FEDERAL AVIATION ADMINISTRATION: REQUIRE THAT BOEING DEVELOP AN APPROVED PREFLIGHT CHECK OF THE RUDDER SYSTEM TO BE USED BY OPERATORS TO VERIFY, TO THE EXTENT POSSIBLE, THE PROPER OPERATION OF THE MAIN RUDDER POWER CONTROL UNIT SERVO VALVE UNTIL A DESIGN CHANGE IS IMPLEMENTED THAT WOULD PRECLUDE THE POSSIBILITY OF RUDDER REVERSALS ATTRIBUTED TO THE OVERTRAVEL OF THE SECONDARY SLIDE.
In plain language (FlightFinder summary)
The FAA is asked to require Boeing to create an approved preflight check of the rudder system for operators to use. This check should verify, to the extent possible, the proper operation of the main rudder power control unit servo valve until a design change prevents rudder reversals caused by overtravel of the secondary slide.
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 | Aug 11, 1994 |
| NTSB number | DCA91MA023 |
| Addressees | FAA |
External links
NTSB safety recommendations are advisory; addressees are not legally required to adopt them. Source: NTSB CAROL (public domain).