A-99-052
NTSB Safety Recommendation — Aviation
Recommendation text
NTSB RECOMMENDS THAT THE FAA: REQUIRE, AS AN INTERIM ACTION, PRATT & WHITNEY TO IDENTIFY ALL JT8D-1 THROUGH -17AR AND JT8D-200 ENGINE COMBUSTION CHAMBER OUTER CASES (CCOC) THAT HAD BOSS WELDS REWORKED DURING MANUFACTURE; REQUIRE REPETITIVE ON-WING INSPECTIONS OF THOSE CCOC'S FOR BOSS WELD CRACKS AT INTERVALS APPROPRIATELY LESS THAN 1,340 CYCLES IN SERVICE; AND, IF CRACKS ARE FOUND, REQUIRE THE REMOVAL OF THOSE ENGINES FROM SERVICE FOR REPLACEMENT OF THE CCOC. PERIODIC INSPECTIONS SHOULD CONTINUE UNTIL A ONE-PIECE, INTEGRAL BOSS CCOC IS INSTALLED.
In plain language (FlightFinder summary)
The FAA is asked by the NTSB to direct Pratt & Whitney to locate all JT8D-1 through -17AR and JT8D-200 engine combustion chamber outer cases (CCOC) that had boss welds reworked during manufacturing. The FAA must also mandate on-wing inspections for cracks in those CCOC at intervals shorter than 1,340 cycles, and if cracks are found, require engine removal for CCOC replacement. Inspections should continue until a one-piece, integral boss CCOC is installed.
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 | Sep 19, 2001 |
| NTSB number | NYC99SA010 |
| Addressees | FAA |
External links
NTSB safety recommendations are advisory; addressees are not legally required to adopt them. Source: NTSB CAROL (public domain).