ASN Wikibase Occurrence # 37302
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| Date: | Saturday 3 August 1991 |
| Time: | 23:47 LT |
| Type: |  Beechcraft C23 Sundowner |
| Owner/operator: | Groton Navy Flying Club |
| Registration: | N9375S |
| MSN: | M1673 |
| Total airframe hrs: | 3486 hours |
| Engine model: | Lycoming O-360-A4K |
| Fatalities: | Fatalities: 3 / Occupants: 3 |
| Aircraft damage: | Destroyed |
| Category: | Accident |
| Location: | Pleasantville, NJ -
 United States of America
|
| Phase: | En route |
| Nature: | Private |
| Departure airport: | Atlantic City, NJ (KAIY) |
| Farmingdale, NY (FRG | |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
THE PILOT EXPERIENCED A POWER LOSS SHORTLY AFTER TAKEOFF WHILE OPERATING OVER A RESIDENTIAL AREA AT NIGHT. THE AIRPLANE STRUCK A TELEPHONE POLE, AND CRASHED AND BURNED IN A STREET. RECORDS INDICATE THE ENGINE HAD A PROP STRIKE AT 1828 HRS, WAS OVERHAULED AT 2164 HRS, AND OVERHAULED AGAIN AT 3407 HRS. THE ACCIDENT OCCURRED AT 3486 HRS. NO RECORDS WERE AVAILABLE FOR THE FIRST OVERHAUL, HOWEVER WHEN EXAMINED AT THE 2ND OVERHAUL THE CRANKSHAFT WAS FOUND TO BE UNDERSIZED BY .003 INCH.. THE CRANKSHAFT HAD FAILED AT THE REAR OF THE NUMBER 3 CRANKPIN. METALLURGICAL EXAMINATION FOUND THE FRACTURE ORIGINATED SUBSURFACE IN AN AREA OF STRESS. NITRIDING RESIDUE WAS FOUND IN CRACKS WHICH HAD NOT BEEN DETECTED BY NONDESTRUCTIVE TESTING. THE FAA DOES NOT REQUIRE THE CERTIFICATION OF NONDESTRUCTIVE TESTING OPERATORS.
Probable Cause: A POWER LOSS DUE TO A FAILED CRANKSHAFT, WHILE OPERATING OVER UNSUITABLE TERRAIN. FACTORS RELATED TO THE ACCIDENT WERE, THE NIGHT CONDITIONS, THE FAILURE OF MAINTENANCE PERSONNEL TO DETECT THE CRACKS USING MAGNAFLUX INSPECTIONS, THE LACK OF ADEQUATE PROCEDURES/DIRECTIONS ON DETECTION OF CRACKS, AND THE LACK OF QUALIFICATIONS/CERTIFICATION FOR OPERATORS CONDUCTING NONDESTRUCTIVE TESTING.
Accident investigation:
 |
|
Sources:
NTSB NYC91FA199
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 24-Oct-2008 10:30 | ASN archive | Added |
| 21-Dec-2016 19:23 | ASN Update Bot | Updated [Time, Damage, Category, Investigating agency] |
| 11-Apr-2024 13:11 | ASN Update Bot | Updated [Time, Other fatalities, Departure airport, Destination airport, Source, Narrative, Accident report] |
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