A-86-062
NTSB Safety Recommendation — Aviation
Recommendation text
THE NTSB RECOMMENDS THAT THE FEDERAL AVIATION ADMINISTRATION: CONDUCT A DIRECTED SAFETY INVESTIGATION OF THE HIGH PRESSURE TURBINE ROTATING AIRSEALS, P/N 5001413-01, IN PRATT & WHITNEY JT9D-7R4 SERIES ENGINES TO DETERMINE THE REQUIREMENTS FOR AN INSPECTION PROGRAM THAT WILL PRECLUDE HIGH FREQUENCY FATIGUE FAILURE OF THE AIRSEALS REGARDLESS OF THE HEAT CODE DESIGNATION OF THE MATERIAL FROM WHICH THE AIRSEALS ARE MADE.
In plain language (FlightFinder summary)
The FAA is asked to conduct a directed safety investigation of the high pressure turbine rotating airseals, part number 5001413-01, in Pratt & Whitney JT9D-7R4 series engines. The goal is to determine the requirements for an inspection program that will prevent high frequency fatigue failure of these airseals, regardless of the heat code designation of the material.
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 | Dec 10, 1987 |
| NTSB number | DCA86RA031 |
| Addressees | FAA |
External links
NTSB safety recommendations are advisory; addressees are not legally required to adopt them. Source: NTSB CAROL (public domain).