<< >> NASA ASRS Report 970961, September 2011

An airport's 100LL underground fuel storage tank was erroneously loaded with jet-a fuel which was then uploaded to reporter's be-55 so after takeoff very high cylinder head and exhaust temperatures alerted the pilot who switched to his uncontaminated aux tanks. Engine damage resulted.

Attributes
ACN	970961
Time
Date	201109
Local Time Of Day	1201-1800
Place
Locale Reference	ZZZ.Airport
State Reference	US
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Make Model Name	Baron 55/Cochise
Operating Under FAR Part	Part 91
Flight Phase	Parked
Route In Use	Direct
Flight Plan	None
Component
Aircraft Component	Fuel
Person 1
Function	Single Pilot
Qualification	Flight Crew Instrument Flight Crew Commercial Flight Crew Multiengine
Experience	Flight Crew Last 90 Days 25 Flight Crew Total 4000 Flight Crew Type 1800
Events
Anomaly	Aircraft Equipment Problem Critical Deviation - Procedural Published Material / Policy

Narrative:

The delivery tanker operator put jet-a in the 100LL underground tank. My aircraft was fueled from the 100LL tank. The result was my tanks contained approximately 30% jet-a. On takeoff I noticed very high cylinder head temps; reduced power and climb rate to cool the engines. I also switched to my aux tanks which were not refueled at that facility and the engine temps returned to normal. The flight was completed to the destination airport. I did not realize the problem was contamination until the next morning when the airport called to report the problem. Engines were damaged due to detonation. Exhaust manifolds started to melt.

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Original NASA ASRS Text

Title: An airport's 100LL underground fuel storage tank was erroneously loaded with JET-A fuel which was then uploaded to reporter's BE-55 so after takeoff very high cylinder head and exhaust temperatures alerted the pilot who switched to his uncontaminated aux tanks. Engine damage resulted.

Narrative: The delivery tanker operator put JET-A in the 100LL underground tank. My aircraft was fueled from the 100LL tank. The result was my tanks contained approximately 30% JET-A. On takeoff I noticed very high cylinder head temps; reduced power and climb rate to cool the engines. I also switched to my aux tanks which were not refueled at that facility and the engine temps returned to normal. The flight was completed to the destination airport. I did not realize the problem was contamination until the next morning when the airport called to report the problem. Engines were damaged due to detonation. Exhaust manifolds started to melt.

Data retrieved from NASA's ASRS site as of April 2012 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.