A-81-063
NTSB Safety Recommendation — Aviation
Recommendation text
THE NTSB RECOMMENDS THAT THE FEDERAL AVIATION ADMINISTRATION: ISSUE AN AIRWORTHINESS DIRECTIVE WHICH REQUIRES A VISUAL INSPECTON FOR ARC BURNS BEFORE AND AFTER EACH REWORK OPERATION ON TITANIUM ALLOY FAN BLADES FROM PRATT AND WHITNEY AIRCRAFT JT9D TURBOFAN ENGINES AND REQUIRES REPLACEMENT OF ARC BURN-AFFECTED BLADES. WE FURTHER RECOMMEND THAT A DESCRIPTION OF ARC BURN IN TITANIUM BE INCLUDED IN THE AIRWORTHINESS DIRECTIVE.
In plain language (FlightFinder summary)
The FAA is asked to issue an airworthiness directive requiring visual inspections for arc burns before and after each rework operation on titanium alloy fan blades from Pratt and Whitney JT9D turbofan engines, and to mandate replacement of any blades with arc burns. The directive should also include a description of arc burn in titanium.
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 | Apr 5, 1982 |
| NTSB number | DCA81AA008 |
| Addressees | FAA |
External links
NTSB safety recommendations are advisory; addressees are not legally required to adopt them. Source: NTSB CAROL (public domain).