ASN Wikibase Occurrence # 295045
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| Date: | Sunday 26 October 2003 |
| Time: | 14:30 LT |
| Type: |  Schweizer 269C |
| Owner/operator: | Bijan Air Inc. |
| Registration: | N191GC |
| MSN: | 0026 |
| Year of manufacture: | 1996 |
| Total airframe hrs: | 2238 hours |
| Engine model: | Lycoming HO-360-C1A |
| Fatalities: | Fatalities: 0 / Occupants: 2 |
| Aircraft damage: | Substantial |
| Category: | Accident |
| Location: | Ann Arbor, Michigan -
 United States of America
|
| Phase: | Unknown |
| Nature: | Training |
| Departure airport: | Ann Arbor Municipal Airport, MI (ARB/KARB) |
| ANN ARBOR, MI | |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
The helicopter was substantially damaged during a hard landing following a loss of engine power and subsequent autorotation. The flight instructor reported that shortly after takeoff, within two miles of the departure airport, the helicopter suddenly yawed to the left and the engine began to uncontrollably increase and decrease speed. He noted that it sounded as if the throttle was being rolled on and off. He added that no warning lights were illuminated. The instructor reported that he took control of the heliopter at that time. He stated that he instructed the dual student to apply carburetor heat. However, the engine continued to rev and was "making a popping sound, like it was backfiring." He noted a drop in rotor speed, so he elected to initiate an autorotation. He estimated their altitude was 500 feet above ground level at that point. "The safest spot I could see was a paved road in a subdivision; we struck the ground hard damaging the helicopter," according to the instructor. A post-accident inspection revealed no anomalies. The engine was subsequently removed and torn down. No abnormalities were found during the disassembly and examination. Weather conditions recorded at the departure airport, approximately 20 minutes after the accident, included a temperature of 9 degrees Celcius and dew point of 1 degree Celcius. Data concerning the probability of carburetor icing was obtained from Transport Canada. The conditions bordered regions of serious icing at any power setting and moderate icing at cruise power.
Probable Cause: The loss of engine power due to carburetor ice. Weather conditions conducive to the formation of carburetor ice and a roadway were contributing factors.
Accident investigation:
 |
|
Sources:
NTSB CHI04LA021
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 12-Oct-2022 17:20 | ASN Update Bot | Added |
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