ASN Wikibase Occurrence # 383571
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| Date: | Monday 16 August 1982 |
| Time: | 14:20 LT |
| Type: |  Cessna 421B |
| Owner/operator: | J.d. Abrams, Inc. |
| Registration: | N1969J |
| MSN: | 421B0588 |
| Year of manufacture: | 1974 |
| Total airframe hrs: | 1650 hours |
| Engine model: | Lycoming LTP101-600A1A |
| Fatalities: | Fatalities: 0 / Occupants: 1 |
| Aircraft damage: | Minor |
| Category: | Serious incident |
| Location: | El Paso, TX -
 United States of America
|
| Phase: | Unknown |
| Nature: | Executive |
| Departure airport: | Austin, TX (KAUS) |
| Milwaukee, WI | |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
N1969J IS A 1974 CESSNA 421B MODIFIED BY A RILEY CONVERSION KIT. THE AIRCRAFT WAS DESCENDING THROUGH ABOUT 1900 FT MSL WHEN, WITHOUT PREVIOUS WARNING, IT YAWED LEFT. THE PILOT REPORTED THAT THE ACFT THEN IMMEDIATELY YAWED SEVERELY TO THE RIGHT AND BEGAN TO PRODUCE A HIGH-PITCHED WHINING NOISE. THE RIGHT ENGINE THEN EXPLODED. ENGINE DEBRIS PENETRATED THE CABIN WALL AND WINDOWS AND STRUCK THE PILOT CAUSING MINOR INJURIES. THE PILOT SECURED THE RT ENGINE, FEATHERED THE PROPELLER AND LANDED AT EL PASO WITHOUT FURTHER INCIDENT. EXAMINATION OF THE ENGINE REVEALED THAT THE POWER TURBINE WHEEL HAD DISINTEGRATED INFLIGHT. INTERNAL EXAMINATION REVEALED A BROKEN N2 ACCESSORY IDLER GEAR WHICH EXHIBITED A FATIGUE FRACTURE. A LOOSE NUT SECURING THE N2 ACCESSORY IDLER GEAR AND N2 SPEED DISC ALLOWED RELATIVE MOVEMENT AND WEAR OF THESE PARTS. FATIGUE OF THE IDLER GEAR CAUSED A LOSS OF DRIVE TO THE OVERSPEED GOVERNOR AND ALLOWED THE ENGINE TO OVERSPEED. THE MANUFACTURER IS REDESIGNING THE ASSEMBLY.
Probable Cause:
Accident investigation:
 |
|
Sources:
NTSB FTW82IA331
Location
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 03-Apr-2024 02:03 | ASN Update Bot | Added |
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