ASN Wikibase Occurrence # 375451
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| Date: | Sunday 16 March 1986 |
| Time: | 11:02 LT |
| Type: |  Hiller UH-12E |
| Owner/operator: | Mark Shepard |
| Registration: | N90475 |
| MSN: | 2366 |
| Engine model: | LYCOMING VO-540-B1A |
| Fatalities: | Fatalities: 0 / Occupants: 1 |
| Aircraft damage: | Substantial |
| Category: | Accident |
| Location: | Poterville, CA -
 United States of America
|
| Phase: | En route |
| Nature: | Ferry/positioning |
| Departure airport: | |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
A HILLER 12E HELICOPTER LANDED HARD AFTER AN ENG FAILURE. THE ACFT WAS ENROUTE TO ANOTHER FIELD SITE AT APRX 100 FT AGL AND 40 KTS IAS. THE ENG QUIT ABRUPTLY AND THE ROTOR RPM DECAYED 100 RPM. THE ACFT WAS ABOUT 2,000 POUNDS GWT AT THE TIME OF THE ACCIDENT AND THE AUTOROTATIONAL RPM WAS RIGGED FOR THE MAXIMUM GWT OF 3,100 POUNDS. THE ENG MAIN CASE WAS CRACKED IN THE VICINITY OF CYL #6. DURING THE ENG TEARDOWN #6 PISTON, CONNECTING ROD AND ONE RODCAP BOLT CAME OFF WITH THE CYL. ONE ROD BOLT WAS BROKEN AND THE NUT WAS STILL ATTACHED TO THE BROKEN END. THE OTHER ROD BOLT WAS UNBROKEN AND THE NUT WAS MISSING.
Probable Cause:
Accident investigation:
 |
|
Sources:
NTSB LAX86LA142
Location
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 28-Mar-2024 20:03 | ASN Update Bot | Added |
Corrections or additions? ... Edit this accident description
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