A-96-022
NTSB Safety Recommendation — Aviation
Recommendation text
THE NTSB RECOMMENDS THAT THE FAA: REQUIRE PERIODIC INSPECTIONS (BY A NONDESTRUCTIVE METHOD SUCH AS FLUORESCENT PENETRANT OR ULTRASONIC) OF TURBINE HUBS ON PRATT & WHITNEY MODEL JT8D ENGINES IF THE HUBS WERE MANUFACTURED FROM INCOLOY 901 ALLOY & MADE FROM ONE OF THE TOP THREE MULTS OF A BILLET IN WHICH CERIMUM &/OR LANTHANUM WAS USED AS A DEOXIDIZING AGENT. THE INTERVAL FOR THE PERIODIC INSPECTION SHOULD BE SUBSTANTIALLY LESS THAN 5,900 FLIGHT CYCLES. (URGENT)
In plain language (FlightFinder summary)
The FAA is asked to require periodic inspections, using nondestructive methods such as fluorescent penetrant or ultrasonic, of turbine hubs on Pratt & Whitney JT8D engines that were manufactured from Incoloy 901 alloy and came from one of the top three mults of a billet where cerium and/or lanthanum was used as a deoxidizing agent. The inspection interval must be substantially less than 5,900 flight cycles. The recommendation is marked as urgent.
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 - Unacceptable Action |
|---|---|
| Mode | Aviation |
| Closed | Jul 23, 1998 |
| NTSB number | NYC96SA057 |
| Addressees | FAA |
External links
NTSB safety recommendations are advisory; addressees are not legally required to adopt them. Source: NTSB CAROL (public domain).