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ASN Wikibase Occurrence # 36423
 
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Date:18-DEC-1999
Time:09:17
Type:Silhouette image of generic VELO model; specific model in this crash may look slightly different
Velocity 173 RG Elite
Owner/operator:Private
Registration: N627KB
MSN: DMO 375
Fatalities:Fatalities: 1 / Occupants: 1
Other fatalities:0
Aircraft damage: Substantial
Category:Accident
Location:Murfreesboro, TN -   United States of America
Phase: Unknown
Nature:Private
Departure airport:Decatur, AL (DCU)
Destination airport:
Investigating agency: NTSB
Narrative:
The pilot was on approach for landing when the airplane experienced a total loss of engine power, and crashed during a forced landing. Examination of the airframe and engine assembly revealed no evidence of a precrash mechanical failure or malfunction. Visual inspection of the spark plugs revealed very black and sooty. Fuel was present in the flow divider but was not present in the line between the fuel servo and flow divider. The servo fuel injector was removed and examined. The fuel diaphragm had not been replaced. The servo fuel injector was placed in a test bench and a functional test performed. Fuel was pouring out of the venturi causing erratic air flow through the regulator and erratic air flow. The air cover and diaphragm was removed to determine the source of the fuel leak. The fuel diaphragm stem was bent. The center body was removed with the fuel diaphragm attached to the center body bellows. The bottom calibration nut was removed from the fuel diaphragm stem. The fuel diaphragm was removed from the bellows and a leakage check was performed. The bellows was split and air was leaking through the bellows. Appropriate AD's and SB's had not been complied with resulting in an in-flight power loss due to an over rich condition.

Probable Cause: The failure of an unknown maintenance person to comply with an Airworthiness Directive (replace center body bellows seal assembly and tube bushings) and Service Bulletin (replace fuel diaphragm) resulting in an in-flight power loss due to an over rich condition caused by the failure of the center body bellows seal assembly, and subsequent forced landing and in-flight collision with terrain.

Sources:

NTSB: https://www.ntsb.gov/_layouts/ntsb.aviation/brief.aspx?ev_id=20001212X20292&key=1


Revision history:

Date/timeContributorUpdates
24-Oct-2008 10:30 ASN archive Added
15-May-2010 11:01 JINX Updated [Aircraft type, Source]
21-Dec-2016 19:23 ASN Update Bot Updated [Time, Damage, Category, Investigating agency]
14-Dec-2017 10:00 ASN Update Bot Updated [Cn, Operator, Destination airport, Source, Narrative]

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