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ASN Wikibase Occurrence # 197370
Last updated: 18 September 2019
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Date:11-AUG-2017
Time:12:00
Type:Silhouette image of generic NAVI model; specific model in this crash may look slightly different
Navion Navion G Rangemaster
Owner/operator:Sky Walker Flying
Registration: N249KC
C/n / msn: NAV-4-2499
Fatalities:Fatalities: 0 / Occupants: 2
Other fatalities:0
Aircraft damage: Substantial
Category:Accident
Location:South of Lenawee County Airport (KADG), Adrian, MI -   United States of America
Phase: Unknown
Nature:Training
Departure airport:Adrian, MI (ADG)
Destination airport:Adrian, MI (ADG)
Investigating agency: NTSB
Narrative:
The flight instructor and private pilot had completed training maneuvers and were returning to the airport when the engine experienced a partial loss of power about 1,000 to 1,500 ft above ground level. They were unable to glide the airplane to an open field and descended into a wooded area. The airplane impacted trees and became wedged between trees, suspended above the ground. The engine and empennage separated from the rest of the airplane and came to rest on the ground nearby. The fuel tanks were damaged and most of the remaining fuel spilled onto the ground.
A postaccident examination of the engine revealed no pre-impact anomalies that would have precluded normal operation or production of rated horsepower; however, an examination of the gascolator showed that it had been leaking fuel from three locations and contained a significant amount of debris. In a postaccident examination, the gascolator was subjected to the relevant service bulletin testing and did not pass the test due to the leaking seals and drain valve. Since the gascolator was unable to seal properly, it would have allowed air into the fuel system, which would have resulted in a loss of engine power. A review of the airplane maintenance records revealed no record of compliance with the service bulletin, nor was compliance mandatory.


Probable Cause: A leak in the gascolator, which allowed air to enter the fuel system and resulted in a partial loss of engine power.

Sources:

NTSB: https://www.ntsb.gov/_layouts/ntsb.aviation/brief.aspx?ev_id=20170814X13131&key=1
https://www.google.com/maps/@?dg=dbrw&newdg=1/6000+Lyons+Hwy,+Adrian,+MI+49221/@41.8423983,-84.0781914,15z/data=!4m2!3m1!1s0x883cf74085b826b1:0xd6c2234a444892b?hl=en-us

FAA register: http://registry.faa.gov/aircraftinquiry/NNum_Results.aspx?NNumbertxt=N249KC

Accident investigation:
cover
  
Investigating agency: NTSB
Status: Investigation completed
Duration: 1 year and 7 months
Download report: Final report


Revision history:

Date/timeContributorUpdates
11-Aug-2017 21:26 Geno Added
12-Aug-2017 12:10 Iceman 29 Updated [Time, Source, Embed code]
14-Aug-2017 15:13 Geno Updated [Aircraft type, Registration, Cn, Operator, Nature, Source, Damage]
22-Mar-2019 19:11 ASN Update Bot Updated [Time, Operator, Departure airport, Destination airport, Source, Damage, Narrative, Accident report, ]

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