ASN Wikibase Occurrence # 377794
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| Date: | Saturday 26 January 1985 |
| Time: | 15:29 LT |
| Type: |  Boeing 727-151 |
| Owner/operator: | Northwest Airlines |
| Registration: | N463US |
| MSN: | 18799/102 |
| Engine model: | P&W JT8D-7B |
| Fatalities: | Fatalities: 0 / Occupants: 61 |
| Aircraft damage: | Minor |
| Category: | Serious incident |
| Location: | St. Paul, MN -
 United States of America
|
| Phase: | Approach |
| Nature: | Passenger - Scheduled |
| Departure airport: | (KMSP) |
| Dallas/Fort Worth International Airport, TX (DFW/KDFW) | |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
SHORTLY AFTER TAKEOF, THE AIRCRAFT EXPERIENCED AN UNCONTAINED 7TH TO 8TH STAGE REMOVABLE SLEEVE COMPRESSOR SPACER FAILURE IN THE NUMBER 3 ENGINE. PIECES OF THE SPACER PASSED THROUGH THE NUMBER 2 ENGINES DUCT CAUSING COMPRESSOR STALLS IN THAT ENGINE. THE AIRCRAFT LANDED SUCESSFULLY 9 MINUTES AFTER TAKEOFF USING THE SINGLE GOOD ENGINE. METALLURGICAL ANALYSIS OF THE RECOVERED SPACER PIECES REVEALED THAT CADMIUM EMBRITTLEMENT HAD OCCURRED AROUND AT LEAST ONE TIEROD SLEEVE HOLE ON THE SPACER. THIS EMBRITTLEMENT OCCURRED BECAUSE THE SPACER WAS INCOMPLETELY PLATED WITH NICKLE DURING A SPACER MODIFICATION THAT TOOK PLACE IN 1975. THE INCOMPLETE NICKLE PLATING ALLOWED A SUBSEQUENT CADIUM LAYER TO COME IN CONTACT WITH THE STEEL SPACER, CAUSING THE EMBRITTLEMENT.
Probable Cause:
Accident investigation:
 |
|
Sources:
NTSB CHI85IA097
Location
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 30-Mar-2024 16:31 | ASN Update Bot | Added |
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