ASN Wikibase Occurrence # 365366
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| Date: | Sunday 5 May 1991 |
| Time: | 17:38 LT |
| Type: |  Robinson R22 BETA |
| Owner/operator: | Private |
| Registration: | N2360K |
| MSN: | 0525 |
| Year of manufacture: | 1986 |
| Engine model: | LYCOMING O-320-B2C |
| Fatalities: | Fatalities: 0 / Occupants: 1 |
| Aircraft damage: | Substantial |
| Category: | Accident |
| Location: | Ann Arbor, MI -
 United States of America
|
| Phase: | Approach |
| Nature: | Private |
| Departure airport: | Ann Arbor, MI (PRIV) |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
THE PLT RPRTD THAT DURING FLT, HE NOTED RPM FLUCTUATIONS & A WARNING BUZZER. HE ADJUSTED THE THROTTLE TO 100% & NOTED THAT ALL GAGES WERE 'IN THE GREEN.' HE CHECKED THE CARBURETOR (CARB) HEAT GAGE & NOTED IT WAS ONE NEEDLE WIDTH ABOVE THE YELLOW SECTION & THAT THE OUTSIDE AIR TEMP WAS 9 DEG C (48 DEG F). WITH THESE INDCNS, HE DISCOUNTED CARB ICE & DID NOT APPLY CARB HEAT. SUBSEQUENTLY, THE ENG LOST ADDITIONAL POWER BEFORE THE PLT COULD REACH THE RWY. DURING AN EMERG LANDING, THE HELICOPTER ROLLED OVER. AN EXAM & SUBSEQUENT ENG RUN REVEALED NO MECHANICAL ANOMALIES, EXCEPT THAT THE CARB AIR TEMP GAGE WAS INDICATING 4 DEG C ABOVE THE ACTUAL TEMP. TEMP & DEW POINT AT ANN ARBOR WERE 51 & 50 DEG F, RESPECTIVELY. ACCORDING TO CARB ICE CHARTS, CONDITIONS WERE CONDUCIVE TO CARB ICE.
Probable Cause: LOSS OF ENGINE POWER DUE TO CARBURETOR ICE, AND THE PILOT'S FAILURE TO USE CARBURETOR HEAT. FACTORS RELATED TO THE ACCIDENT WERE: CARBURETOR ICING CONDITIONS, AND A FALSE INDICATION FROM THE CARBURETOR AIR TEMPERATURE GAGE.
Accident investigation:
 |
|
Sources:
NTSB CHI91LA146
Location
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 20-Mar-2024 09:26 | ASN Update Bot | Added |
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