A B737-800 was dispatched in non compliance with #2 engine cowl anti-ice valve inoperative in the open position per the MEL, but pressure switch connector not disconnected.

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Attributes
ACN	598647
Time
Date	200311
Day	Mon
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : zzz.airport
State Reference	US
Environment
Light	Daylight
Aircraft 1
Operator	common carrier : air carrier
Make Model Name	B737-800
Operating Under FAR Part	Part 121
Flight Phase	ground : preflight ground : maintenance
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	maintenance : technician
ASRS Report	598647
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Events
Anomaly	aircraft equipment problem : critical maintenance problem : non compliance with mel non adherence : published procedure non adherence : far
Independent Detector	aircraft equipment other aircraft equipment : #2 engine cowl light other flight crewa other flight crewb
Resolutory Action	flight crew : diverted to another airport flight crew : overcame equipment problem
Consequence	other other
Factors
Maintenance	contributing factor : schedule pressure contributing factor : manuals performance deficiency : logbook entry performance deficiency : non compliance with legal requirements
Supplementary
Problem Areas	Maintenance Human Performance Aircraft Chart Or Publication
Primary Problem	Maintenance Human Performance

Narrative:

Aircraft ground interrupted at approximately XA30 hours on nov/mon/03, with #2 engine cowl anti-ice light illuminated. Opened and inspected #2 engine anti-ice components and did not find any physical defects. Valve and switch were not in stock. Course of action was to placard valve in the open position per MEL. Aircraft departed and at approximately XC03 hours, ground interrupted again with same problem. While trying to ascertain what the problem could be, I discovered that I did not disconnect 'C/P' from pressure switch per mpm 30-3B. Disconnected 'C/P.' aircraft departed with no further problems.

Original NASA ASRS Text

Title: A B737-800 WAS DISPATCHED IN NON COMPLIANCE WITH #2 ENG COWL ANTI-ICE VALVE INOP IN THE OPEN POS PER THE MEL, BUT PRESSURE SWITCH CONNECTOR NOT DISCONNECTED.

Narrative: ACFT GND INTERRUPTED AT APPROX XA30 HRS ON NOV/MON/03, WITH #2 ENG COWL ANTI-ICE LIGHT ILLUMINATED. OPENED AND INSPECTED #2 ENG ANTI-ICE COMPONENTS AND DID NOT FIND ANY PHYSICAL DEFECTS. VALVE AND SWITCH WERE NOT IN STOCK. COURSE OF ACTION WAS TO PLACARD VALVE IN THE OPEN POS PER MEL. ACFT DEPARTED AND AT APPROX XC03 HRS, GND INTERRUPTED AGAIN WITH SAME PROB. WHILE TRYING TO ASCERTAIN WHAT THE PROB COULD BE, I DISCOVERED THAT I DID NOT DISCONNECT 'C/P' FROM PRESSURE SWITCH PER MPM 30-3B. DISCONNECTED 'C/P.' ACFT DEPARTED WITH NO FURTHER PROBS.

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.