A mechanic and maintenance controller report on their involvement with a B737-800 left engine anti-i...

Attributes
ACN	843987
Time
Date	200906
Local Time Of Day	0601-1200
Place
Locale Reference	ZZZ.Airport
State Reference	US
Environment
Light	Daylight
Aircraft 1
Make Model Name	B737-800
Operating Under FAR Part	Part 121
Flight Phase	Parked
Flight Plan	IFR
Component
Aircraft Component	Intake Ice System
Person 1
Function	Technician
Qualification	Maintenance Powerplant Maintenance Airframe
Person 2
Function	Other / Unknown
Events
Anomaly	Aircraft Equipment Problem Critical Deviation - Procedural Maintenance Deviation - Procedural MEL Deviation - Procedural FAR Deviation - Procedural Published Material / Policy

Narrative:

As the B737-800 aircraft was ready for departure; pilot reports left engine cowl anti-ice valve light on. I called maintenance control from jet bridge to placard the valve in the 'open' position per MEL 30-3B. I performed maintenance procedures manual (mpm); but did not disconnect pressure switch connector. Also; did not placard high stage bleed air module and shut-off (second officer) valve; because I was never instructed by maintenance control to do so. Aircraft had an air interrupt later; with cowl anti-ice valve (light) 'on.' after aircraft came back; I disconnected connector from pressure switch and another mechanic placarded inop the high stage bleed air module and shut-off valve per MEL.

Original NASA ASRS Text

Title: A Mechanic and Maintenance Controller report on their involvement with a B737-800 left engine Anti-Ice Valve incomplete MEL deferral; that caused an Air Turnback.

Narrative: As the B737-800 aircraft was ready for departure; pilot reports left engine Cowl Anti-Ice Valve light on. I called Maintenance Control from Jet Bridge to placard the valve in the 'open' position per MEL 30-3B. I performed Maintenance Procedures Manual (MPM); but did not disconnect Pressure Switch connector. Also; did not placard High Stage Bleed Air Module and Shut-off (S/O) valve; because I was never instructed by Maintenance Control to do so. Aircraft had an Air Interrupt later; with Cowl Anti-Ice valve (light) 'on.' After aircraft came back; I disconnected connector from Pressure switch and another Mechanic Placarded inop the High Stage Bleed Air Module and Shut-off valve per MEL.

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.

A mechanic and maintenance controller report on their involvement with a B737-800 left engine anti-ice valve incomplete MEL deferral; that caused an air turnback.