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 |
Destination airport: | Hemet, CA (17L) |
Investigating agency: | NTSB |
Confidence Rating: | Accident investigation report completed and information captured |
Narrative: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:
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| |
Investigating agency: | NTSB |
Report number: | LAX87FA173 |
Status: | Investigation completed |
Duration: | 2 years 1 month |
Download report: | Final report |
|
Sources:
NTSB LAX87FA173
Location
Revision history:
Date/time | Contributor | Updates |
27-Mar-2024 11:15 |
ASN Update Bot |
Added |
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