- Date
- September 4, 1969
- Place
- Mammoth Lks, CA · MAMMOTH LKS, CA
- Injuries
- 2 minor
- Damage
- Substantial damage
- Phase of flight
- Enroute
- Aircraft
- N9730CHiller Acft UH-12L
- Status
- Completed · report May 18, 1970
- Report
- Brief approved by the director
- Case key
- 152517
From the NTSB’s public API. By law, NTSB reports can’t be used as evidence in lawsuits over the accident.
On this page
NTSB brief
NTSB’s brief of the accident, as it was printed: the coded facts, with the probable cause and factors.
---------------------------------------------------------------------------------------------------------------------------- FILE DATE LOCATION AIRCRAFT DATA INJURIES FLIGHT PILOT DATA F S M/N PURPOSE ---------------------------------------------------------------------------------------------------------------------------- 3-4192 69/9/4 MAMMOTH LKS,CALIF HILLER ACFT UH-12L CR- 0 0 1 MISCELLANEOUS COMMERCIAL, AGE 34, 3200 TIME - 1450 N9730C PX- 0 0 1 SEARCH AND RESCUE TOTAL HOURS, 100 IN TYPE, DAMAGE-SUBSTANTIAL OT- 0 0 0 NOT INSTRUMENT RATED. DEPARTURE POINT INTENDED DESTINATION MAMMOTH LKS,CALIF LAKE EDIZA,CALIF TYPE OF ACCIDENT PHASE OF OPERATION ENGINE FAILURE OR MALFUNCTION IN FLIGHT: NORMAL CRUISE ROLL OVER LANDING: POWER-ON LANDING PROBABLE CAUSE(S) POWERPLANT - EXHAUST SYSTEM: EXTERNAL SUPERCHARGER MISCELLANEOUS ACTS,CONDITIONS - STUCK TERRAIN - ROUGH/UNEVEN PARTIAL POWER LOSS - PARTIAL LOSS OF POWER - 1 ENGINE EMERGENCY CIRCUMSTANCES - FORCED LANDING OFF AIRPORT ON LAND REMARKS- BELLOWS STUCK IN DENSITY CONTROLLER.
Aircraft
- Registration
- N9730C
- Reported as
- Hiller Acft UH-12L
- Category
- Helicopter
- Engine
- reciprocating
- Damage
- Substantial damage
Matched to the registry by N-number and the event date; the registry’s history has gaps, so older matches can be wrong. Compare the reported make and model.