A-85-133
NTSB Safety Recommendation — Aviation
Recommendation text
THE NTSB RECOMMENDS THAT THE FEDERAL AVIATION ADMINISTRATION: REQUIRE THE MANUFACTURER TO MODIFY THE DESIGN OF THE BOEING 747 EMPENNAGE SO THAT IN THE EVENT THAT A SIGNIFICANT PRESSURE BUILDUP OCCURS IN THE NORMALLY UNPRESSURIZED EMPENNAGE, THE STRUCTURAL INTEGRITY OF THE STABILIZERS AND THEIR RESPECTIVE CONTROL SURFACES WILL BE PROTECTED AGAINST CATASTROPHIC FAILURE, AND TO INCORPORATE ASSOCIATED MODIFICATIONS ON ALL BOEING 747 AIRPLANES.
In plain language (FlightFinder summary)
The FAA is asked to mandate that Boeing redesign the empennage of the 747 so that if significant pressure builds up in the normally unpressurized area, the stabilizers and control surfaces remain structurally safe from catastrophic failure, and to apply the modifications to all 747 aircraft.
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 | Aug 4, 1986 |
| NTSB number | DCA85RA032 |
| Addressees | FAA |
External links
NTSB safety recommendations are advisory; addressees are not legally required to adopt them. Source: NTSB CAROL (public domain).