Narrative:

The flight crew of aircraft xyz reported all #1 engine anti-ice valves inoperative. The overhead panel was replaced with no help. Upon further inspection, a circuit breaker was found popped. After resetting the breaker, all valves worked normal except #1 engine right anti-ice valve. The MEL was consulted for dispatch with the valve wired open. By my mistake the #1 engine fuel heat valve was wired open. This valve is identical to the anti-ice valve and in very close proximity to the engine anti-ice valve. As a result of this error, the engine experienced high oil temperature resulting in an engine shutdown in flight and return to base. Opening #1 engine cowling and identing the purpose of each valve revealed my mistake. The MEL provides information to identify the proper valve, however, this information is not revealed in good chronological order. The MEL reference for an inoperative valve is on page xxa for the 200 series aircraft. Page xxb discusses the -300 series aircraft, page xxc discusses the -800 series aircraft and page xxd finally discusses additional procedures for deferring the valve open. There is nothing on page xxa to reference the mechanic to the information on page xxd. I feel this contributed to the incident. I also referenced another maintenance manual. To prevent such an incident in the future, I recommend 1) closer adherence to the aircraft maintenance manual for necessary and important information. 2) rewriting the MEL to combine all pertinent information for a particular series aircraft in some form of order.

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Original NASA ASRS Text

Title: A B737-200 IMMEDIATELY AFTER TKOF DECLARED AN EMER AND DIVERTED DUE TO #1 ENG HIGH OIL TEMP CAUSED BY THE WRONG ANTI-ICE VALVE WIRED OPEN PER THE MEL.

Narrative: THE FLC OF ACFT XYZ RPTED ALL #1 ENG ANTI-ICE VALVES INOP. THE OVERHEAD PANEL WAS REPLACED WITH NO HELP. UPON FURTHER INSPECTION, A CIRCUIT BREAKER WAS FOUND POPPED. AFTER RESETTING THE BREAKER, ALL VALVES WORKED NORMAL EXCEPT #1 ENG R ANTI-ICE VALVE. THE MEL WAS CONSULTED FOR DISPATCH WITH THE VALVE WIRED OPEN. BY MY MISTAKE THE #1 ENG FUEL HEAT VALVE WAS WIRED OPEN. THIS VALVE IS IDENTICAL TO THE ANTI-ICE VALVE AND IN VERY CLOSE PROX TO THE ENG ANTI-ICE VALVE. AS A RESULT OF THIS ERROR, THE ENG EXPERIENCED HIGH OIL TEMP RESULTING IN AN ENG SHUTDOWN IN FLT AND RETURN TO BASE. OPENING #1 ENG COWLING AND IDENTING THE PURPOSE OF EACH VALVE REVEALED MY MISTAKE. THE MEL PROVIDES INFO TO IDENT THE PROPER VALVE, HOWEVER, THIS INFO IS NOT REVEALED IN GOOD CHRONOLOGICAL ORDER. THE MEL REF FOR AN INOP VALVE IS ON PAGE XXA FOR THE 200 SERIES ACFT. PAGE XXB DISCUSSES THE -300 SERIES ACFT, PAGE XXC DISCUSSES THE -800 SERIES ACFT AND PAGE XXD FINALLY DISCUSSES ADDITIONAL PROCS FOR DEFERRING THE VALVE OPEN. THERE IS NOTHING ON PAGE XXA TO REF THE MECH TO THE INFO ON PAGE XXD. I FEEL THIS CONTRIBUTED TO THE INCIDENT. I ALSO REFED ANOTHER MAINT MANUAL. TO PREVENT SUCH AN INCIDENT IN THE FUTURE, I RECOMMEND 1) CLOSER ADHERENCE TO THE ACFT MAINT MANUAL FOR NECESSARY AND IMPORTANT INFO. 2) REWRITING THE MEL TO COMBINE ALL PERTINENT INFO FOR A PARTICULAR SERIES ACFT IN SOME FORM OF ORDER.

Data retrieved from NASA's ASRS site as of July 2007 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.