ASN Wikibase Occurrence # 373265
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| Date: | Saturday 11 April 1987 |
| Time: | 07:35 LT |
| Type: |  Hughes 369E |
| Owner/operator: | Kensrue Development Corp. |
| Registration: | N5200W |
| MSN: | 0025E |
| Total airframe hrs: | 333 hours |
| Engine model: | Allison 250-C20B |
| Fatalities: | Fatalities: 0 / Occupants: 2 |
| Aircraft damage: | Substantial |
| Category: | Accident |
| Location: | Palm Desert, CA -
 United States of America
|
| Phase: | Manoeuvring (airshow, firefighting, ag.ops.) |
| Nature: | Private |
| Departure airport: | Bermuda Dunes, CA |
| Hemet, CA (17L) | |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
THE HELICOPTER DSCNDD UNCONTROLLED & CRASHED IN A RESIDENTIAL AREA. AFTER THE ACDNT, THE PLT SAID HE AGREED TO ORBIT THE RESIDENCE OF HIS PAX. AT THE APRX 135 DEG POINT OF A LEFT ORBIT, HE FELT 'A BANG & SEVERE VIBRATION IN THE TAIL.' THE PLT LOST DRCTNL CTL & THE HELICOPTER BEGAN SPINNING TO THE RIGHT. AN EXAM OF THE TAIL ROTOR GEAR BOX (T/R GB) ASSY REVEALED 3 OF 4 T/R GB MOUNTING STUDS HAD FAILED FROM CYCLIC FATIGUE DUE TO BENDING WHICH HAD RESULTED FROM A LOSS OF CLAMP-UP TORQUE. SUBSEQUENTLY, THE LOWER RIGHT EAR OF THE T/R GB (AT THE LCTN OF THE 4TH STUD) FAILED FROM OVERLOAD & THE T/R GB SEPD. FURTHER INVESTIGATION REVEALED THAT 3 WASHERS HAD BEEN INSTALLED ON EACH OF THE MOUNTING STUDS, BUT ONLY ONE WAS PERMITTED. THE WASHERS WERE INSTALLED DURING COMPLIANCE WITH AD 86-20-07, 78 FLT HRS BEFORE THE ACDNT.
Probable Cause:
Accident investigation:
 |
|
Sources:
NTSB LAX87FA173
Location
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 27-Mar-2024 11:15 | ASN Update Bot | Added |
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