A-02-044
NTSB Safety Recommendation — Aviation
Recommendation text
TO THE FEDERAL AVIATION ADMINISTRATION: Pending the incorporation of a fail-safe mechanism in the design of the Douglas DC-9, McDonnell Douglas MD-80/90, and Boeing 717 horizontal stabilizer jackscrew assembly, as recommended in Safety Recommendation A-02-49, establish an end play check interval that (1) accounts for the possibility of higher-than-expected wear rates and measurement error in estimating acme nut thread wear and (2) provides for at least two opportunities to detect excessive wear before a potentially catastrophic wear condition becomes possible.
In plain language (FlightFinder summary)
The Federal Aviation Administration is asked to set an end play check interval for the horizontal stabilizer jackscrew assembly on Douglas DC-9, McDonnell Douglas MD-80/90, and Boeing 717 aircraft. This interval should account for possible higher wear rates and measurement errors in estimating acme nut thread wear, and provide at least two chances to detect excessive wear before a catastrophic condition can develop, pending a fail-safe design change.
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 | Mar 8, 2007 |
| NTSB number | DCA00MA023 |
| Addressees | FAA |
External links
NTSB safety recommendations are advisory; addressees are not legally required to adopt them. Source: NTSB CAROL (public domain).