ASN Wikibase Occurrence # 356004
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| Date: | Wednesday 16 April 1997 |
| Time: | 20:50 LT |
| Type: |  Boeing 737-3Y0 |
| Owner/operator: | Western Pacific |
| Registration: | N962WP |
| MSN: | 23748/1381 |
| Year of manufacture: | 1987 |
| Total airframe hrs: | 25952 hours |
| Engine model: | GE CFM56-3-B2 |
| Fatalities: | Fatalities: 0 / Occupants: 125 |
| Aircraft damage: | None |
| Category: | Serious incident |
| Location: | Colorado Spgs, CO -
 United States of America
|
| Phase: | Approach |
| Nature: | Unknown |
| Departure airport: | Houston, TX (KIAH) |
| (KCOS) | |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
While on short final to land, at approximately 200 feet above ground level, the APU fire warning light illuminated. The crew performed the appropriate procedures and the fire warning light extinguished. After landing, the crew had the fire department visually inspect the aircraft and follow the aircraft to the gate where the passengers were off loaded in normal fashion. Examination and testing of the APU revealed that a fire had occurred in the APU exhaust as a result of oil entering the hot exhaust gas stream due to leakage around the aft turbine bearing seal. The seal evidenced scoring around its circumference and the seal surface was treated, in accordance with the maintenance manual, by Metco spray. Due to previous history of oil leakage around the seals treated with Metco Spray, in 1988, Allied Signal changed the treatment to Tungsten carbide which eliminated the leakage problem. However, due to some operators having difficulty in obtaining the Tungsten carbide coating, the Metco spray coating procedure was left in the overhaul manual.
Probable Cause: An oil leak around the APU aft bearing seal which resulted in a fire in the APU exhaust.
Accident investigation:
 |
|
Sources:
NTSB FTW97IA160
Location
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 12-Mar-2024 18:03 | ASN Update Bot | Added |
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