ASN Wikibase Occurrence # 375483
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| Date: | Sunday 9 March 1986 |
| Time: | 16:15 LT |
| Type: |  Hughes 500D |
| Owner/operator: | Air Pegasus |
| Registration: | N8352F |
| MSN: | 1260066D |
| Year of manufacture: | 1976 |
| Total airframe hrs: | 1987 hours |
| Engine model: | Allison 250-C20B |
| Fatalities: | Fatalities: 0 / Occupants: 4 |
| Aircraft damage: | Substantial |
| Category: | Accident |
| Location: | Mt. Crawford, VA -
 United States of America
|
| Phase: | En route |
| Nature: | Private |
| Departure airport: | Shendandoah, VA |
| Mt. Jackson, VA | |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
AFTER REFUELING AT SHENANDOAH VALLEY AIRPORT LOCATED NEAR STAUNTON, VIRGINIA, THE HELICOPTER CLIMBED TO ABOUT 1800 FEET MSL ON A NORTH HEADING. APPROXIMATELY 15 MINUTES AFTER DEPARTURE A LOUD RUMBLE WAS HEARD COMING FROM THE REAR OF THE AIRCRAFT AND THE PILOT IMMEDIATELY LOWERED THE COLLECTIVE AND ROLLED OFF THE THROTTLE. THE STUDENT PILOT, SITTING IN THE RIGHT FRONT SEAT, STATED THAT AFTER THE PILOT INITIATED THE FLARE, THE HELICOPTER 'HUNG IN THE AIR FOR A MONENT AT APPROX. 30' AGL THEN DROPPED TO THE GROUND AND ROLLED OVER.' DISASSEMBLY OF THE TAIL ROTOR DRIVE GEAR ASSEMBLY REVEALED THAT THE OUTPUT DRIVE PINION HAD FAILED. LABORATORY EXAMINATION REVEALED THAT THE FRACTURE SURFACES REVEALED MARKINGS TYPICAL OF FATIGUE PROGRESSION. MCDONNELL DOUGLAS HELICOPTER COMPANY HAD ISSUED AN ENGINEERING ORDER #139419 WHICH CONCERNED REWORKING THE DRIVE PINION, HOWEVER, A SERVICE BULLETIN WAS NOT ISSUED REGARDING THE NEED TO REWORK THE PINION AT OVERHAUL.
Probable Cause:
Accident investigation:
 |
|
Sources:
NTSB BFO86FA018
History of this aircraft
Other occurrences involving this aircraft
| 13 May 1984 | N8352F | Rotar Aire | 0 | Rensselaer, IN | |
sub |
| 10 January 2013 | OH-HNP | Heliwest Oy | 0 | Paavolantie, Kämmenniemi, near Tampere |  |
w/o |
Location
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 28-Mar-2024 20:23 | ASN Update Bot | Added |
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