ASN Wikibase Occurrence # 45630
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| Date: | Tuesday 26 February 2002 |
| Time: | 16:50 |
| Type: |  Grumman American AA-1B |
| Owner/operator: | Private |
| Registration: | N1628R |
| MSN: | AA1B-0628 |
| Total airframe hrs: | 2347 hours |
| Engine model: | Avco Lycoming o-235-c2c |
| Fatalities: | Fatalities: 1 / Occupants: 1 |
| Aircraft damage: | Substantial |
| Category: | Accident |
| Location: | Pomona, CA -
 United States of America
|
| Phase: | Approach |
| Nature: | Private |
| Departure airport: | LA VERNE, CA (POC) |
| Investigating agency: | NTSB |
| Confidence Rating: |  Information verified through data from accident investigation authorities |
The engine lost power in the traffic pattern base to final turn during a post maintenance test flight and the airplane collided with a building short of the airport. The carburetor was overhauled about 11 hours prior to the accident. During post overhaul flights an intermittent carburetor rich fuel/air mixture was noted in the idle circuit, which prevented the engine from idling below about 1100 rpm without fouling and quitting from excessive fuel. The carburetor was removed and sent back to the overhaul shop who removed the installed needle valve assembly and replaced it with another identical new assembly. The carburetor was then installed on the engine. When the main fuel shutoff valve was turned on, fuel began to run out of the carburetor. It was again removed and returned to the overhaul shop. The shop owner suspected that a stuck or hanging up float may have been also been the problem. Since the carburetor was equipped with an Advanced Polymer float, which is larger than either the original brass or older style composite float, the shop owner carefully adjusted the float for lateral clearance between the float and the bowl wall, and, between the float clip and the needle valve. After several attempts on the test bench to achieve a stabilized fuel level, the carburetor finally passed. The pilot (an A
Accident investigation:
 |
|
Sources:
NTSB: https://www.ntsb.gov/_layouts/ntsb.aviation/brief.aspx?ev_id=20020228X00283&key=1
Location
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 28-Oct-2008 00:45 | ASN archive | Added |
| 21-Dec-2016 19:24 | ASN Update Bot | Updated [Time, Damage, Category, Investigating agency] |
| 09-Dec-2017 15:49 | ASN Update Bot | Updated [Source, Narrative] |
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