A-98-031
NTSB Safety Recommendation — Aviation
Recommendation text
THE NTSB RECOMMENDS THAT THE FAA: CONDUCT A CRITICAL DESIGN REVIEW OF CF6-50-80 SERIES HIGH-PRESSURE COMPRESSOR STAGE 3-9 SPOOLS TO ASSESS THE OVERALL SAFETY & SOUNDNESS OF THE PART. THE REVIEW SHOULD, AT A MINIMUM, EVALUATE THE FOLLOWING. THE PROPRIETY OF USING TI-6242 TITANIUM ALLOY, INCLUDING THE POSSIBLE SUSCEPTIBILITY OF THIS ALLOY TO THE DEVELOPMENT OF ABERRANT OR UNDESIRABLE CRYSTALLOGRAPHIC ARRANGEMENTS OF ALPHA PHASE & A RESULTING VULNERABILITY TO RAPID CRACKING.
In plain language (FlightFinder summary)
The FAA is asked to perform a critical design review of CF6-50-80 series high-pressure compressor stage 3-9 spools to evaluate their overall safety and soundness. The review must assess the appropriateness of using Ti-6242 titanium alloy, including its potential for developing undesirable crystallographic arrangements of alpha phase that could lead to rapid cracking.
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 | Oct 5, 2000 |
| NTSB number | DCA97WA064 |
| Addressees | FAA |
External links
NTSB safety recommendations are advisory; addressees are not legally required to adopt them. Source: NTSB CAROL (public domain).