A turbo commander 690B fuel cap came off in flight while the cap chain became wedged in the fill flapper valve which allowed fuel to siphon out; draining the tanks and causing both engines to flame out at 16;000 ft. A successful on airport landing was completed.

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Attributes
ACN	990779
Time
Date	201201
Local Time Of Day	1801-2400
Place
Locale Reference	ZZZ.ARTCC
State Reference	US
Environment
Flight Conditions	VMC
Light	Dusk
Aircraft 1
Make Model Name	Turbo Commander 690 Series
Operating Under FAR Part	Part 91
Flight Phase	Cruise
Flight Plan	IFR
Component
Aircraft Component	Fuel Tank Cap
Person 1
Function	Captain
Qualification	Flight Crew Instrument Flight Crew Commercial
Experience	Flight Crew Last 90 Days 80 Flight Crew Total 2000 Flight Crew Type 30
Events
Anomaly	Aircraft Equipment Problem Critical Deviation - Procedural Published Material / Policy Inflight Event / Encounter Fuel Issue

Narrative:

Fuel gauge read inaccurate; low fuel light came on and within 2 minutes both engines flame out. Got vectors to nearest airfield and landed safely on the runway. One fuel cap was missing upon landing.

Original NASA ASRS Text

Title: A Turbo Commander 690B fuel cap came off in flight while the cap chain became wedged in the fill flapper valve which allowed fuel to siphon out; draining the tanks and causing both engines to flame out at 16;000 FT. A successful on airport landing was completed.

Narrative: Fuel gauge read inaccurate; low fuel light came on and within 2 minutes both engines flame out. Got vectors to nearest airfield and landed safely on the runway. One fuel cap was missing upon landing.

Data retrieved from NASA's ASRS site as of July 2013 and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.