ASN Wikibase Occurrence # 36017
This information is added by users of ASN. Neither ASN nor the Flight Safety Foundation are responsible for the completeness or correctness of this information.
If you feel this information is incomplete or incorrect, you can submit corrected information.
| Date: | Saturday 31 March 1990 |
| Time: | 13:38 |
| Type: |  Hiller UH-12D |
| Owner/operator: | private |
| Registration: | N94496 |
| MSN: | 1341 |
| Total airframe hrs: | 6125 hours |
| Engine model: | LYCOMING O-435-A1C |
| Fatalities: | Fatalities: 1 / Occupants: 3 |
| Aircraft damage: | Substantial |
| Category: | Accident |
| Location: | Soddy-Daisy, TN -
 United States of America
|
| Phase: | Take off |
| Nature: | Private |
| Departure airport: | Hixson, TN |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
SHORTLY AFTER TAKEOFF, THE PILOT OBSERVED DECREASING ENGINE AND ROTOR RPM. HE LOWERED THE COLLECTIVE, BUT THE RPM DID NOT RETURN. THE HELICOPTER COLLIDED WITH TREES AND TERRAIN DURING THE FORCED LANDING ATTEMPT. AN INSPECTION OF THE HELICOPTER REVEALED THAT THE COLLECTIVE PITCH PUSH ROD (ADJUSTABLE) HAD FAILED IN FATIGUE. THE LAST RECORDED MAINTENANCE WAS PERFORMED ON FEBRUARY 22, 1988, MORE THAN TWO YEARS PRIOR TO THE ACCIDENT. THE PILOT/OWNER WAS OPERATING THE HELICOPTER WITH A STUDENT PILOT CERTIFICATE AND WAS CARRYING PASSENGERS. CAUSE: FATIGUE INDUCED FAILURE OF THE COLLECTIVE PITCH PUSH ROD (ADJUSTABLE) DURING FLIGHT, AND THE FAILURE OF THE PILOT TO PROVIDE ROUTINE MAINTENANCE. THE PILOT'S LACK OF EXPEREINCE AND HIS FAILURE TO OBTAIN REQUIRED TRAINING AND CERTIFICATION WERE FACTORS IN THE ACCIDENT.
Sources:
NTSB: https://www.ntsb.gov/ntsb/brief.asp?ev_id=20001212X22659
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 24-Oct-2008 10:30 | ASN archive | Added |
| 21-Dec-2016 19:22 | ASN Update Bot | Updated [Time, Damage, Category, Investigating agency] |
Corrections or additions? ... Edit this accident description
The Aviation Safety Network is an exclusive service provided by:
Quick Links:
| ASN Home | Send Correction / Feedback |
| FSF Home | Disclaimer | Copyright |
| Contact Us | Privacy Policy |
| Press / Media |
CONNECT WITH US:
©2024 Flight Safety Foundation