ASN Wikibase Occurrence # 363375
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| Date: | Wednesday 1 July 1992 |
| Time: | 21:40 LT |
| Type: | Bernard W. Resnik ACRO-SPECIAL |
| Owner/operator: | Private |
| Registration: | N79WA |
| MSN: | 3 |
| Total airframe hrs: | 101 hours |
| Engine model: | LYCOMING O-320-E2D |
| Fatalities: | Fatalities: 0 / Occupants: 2 |
| Aircraft damage: | Substantial |
| Category: | Accident |
| Location: | Earlham, IA -
 United States of America
|
| Phase: | Initial climb |
| Nature: | Private |
| Departure airport: | |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
THE HOMEBUILT ACCIDENT AIRPLANE LOST ENGINE POWER DURING INITIAL CLIMB FROM TAKEOFF. IT COLLIDED WITH TREES AND TERRAIN DURING A FORCED LANDING. THE PILOT DESCRIBED HOW HE HAD BEEN FLYING ABOUT 45 MINUTES AND HAD DONE TWO LANDINGS AND TAKEOFFS. DURING THE THIRD TAKEOFF THE AIRPLANE HAD CLIMBED ABOUT 75 TO 100 FEET WHEN THE ENGINE LOST POWER. EXAMINATION OF THE CARBURETOR AIR BOX REVEALED A FLAPPER VALVE IN THE AIR BOX HAD BROKEN. THE VALVE PLATE WAS FREE TO MOVE ABOUT IN THE SPACE BETWEEN THE SHAFT AND THE CARBURETOR AIR INTAKE. THE PLATE HAD BEEN SECURED TO THE SHAFT WITH TWO SPOT WELDS. THE SURFACE OF THE BROKEN WELDS APPEARED DULL EXCEPT FOR A SMALL PORTION ON ONE WELD WHERE THE BREAK APPEARED SHINY. THE CARBURETOR AIR BOX HAD BEEN PURCHASED FROM AN AIRCRAFT SALVAGE OPERATOR FOR INSTALLATION ON THE AIRPLANE.
Probable Cause: A LOSS OF TOTAL ENGINE POWER WHEN A FAILED FLAPPER VALVE IN THE AIR BOX BLOCKED THE FLOW OF AIR THROUGH THE CARBURETOR THROAT.
Accident investigation:
 |
|
Sources:
NTSB CHI92DCD07
Location
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 18-Mar-2024 16:32 | ASN Update Bot | Added |
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