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A B737-700 was dispatched with #2 engine cowl anti-ice valve inoperative open per the MEL. Returned to gate due to overpressure warning. Maintenance failed to remove connector from pressure switch.
| Attributes | |
| ACN | 722058 |
| Time | |
| Date | 200612 |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | airport : zzz.airport |
| State Reference | US |
| Altitude | agl single value : 0 |
| Aircraft 1 | |
| Operator | common carrier : air carrier |
| Make Model Name | B737-700 |
| Operating Under FAR Part | Part 121 |
| Flight Phase | ground : maintenance |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | maintenance : technician |
| Qualification | technician : powerplant technician : airframe |
| ASRS Report | 722058 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | maintenance : lead technician |
| ASRS Report | 722057 |
| 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 : over pressure warning other flight crewa |
| Resolutory Action | other |
| Consequence | other other |
| Factors | |
| Maintenance | contributing factor : schedule pressure contributing factor : manuals performance deficiency : non compliance with legal requirements performance deficiency : logbook entry |
| Supplementary | |
| Problem Areas | Maintenance Human Performance Chart Or Publication Aircraft |
| Primary Problem | Maintenance Human Performance |
Narrative:
Maintenance was called to aircraft for a #2 engine anti-ice problem. We decided the anti-ice valve was bad and needed to be changed. We changed the part and discovered it was bad out of stock. Not having another anti-ice valve; maintenance control told us to defer it. The procedure was to close the high stage valve; open the anti-ice valve. (They failed to tell us to take the cannon plug off the pressure switch.) when the plane left the gate they (the crew) got an overpressure light and came back to the gate. We found out that we need to pull and stow the cannon plug; which we did and the aircraft left. The lack of good communication; and not looking at the MEL ourselves; caused the problem.
Original NASA ASRS Text
Title: A B737-700 WAS DISPATCHED WITH #2 ENG COWL ANTI-ICE VALVE INOP OPEN PER THE MEL. RETURNED TO GATE DUE TO OVERPRESSURE WARNING. MAINT FAILED TO REMOVE CONNECTOR FROM PRESSURE SWITCH.
Narrative: MAINT WAS CALLED TO ACFT FOR A #2 ENG ANTI-ICE PROB. WE DECIDED THE ANTI-ICE VALVE WAS BAD AND NEEDED TO BE CHANGED. WE CHANGED THE PART AND DISCOVERED IT WAS BAD OUT OF STOCK. NOT HAVING ANOTHER ANTI-ICE VALVE; MAINT CTL TOLD US TO DEFER IT. THE PROC WAS TO CLOSE THE HIGH STAGE VALVE; OPEN THE ANTI-ICE VALVE. (THEY FAILED TO TELL US TO TAKE THE CANNON PLUG OFF THE PRESSURE SWITCH.) WHEN THE PLANE LEFT THE GATE THEY (THE CREW) GOT AN OVERPRESSURE LIGHT AND CAME BACK TO THE GATE. WE FOUND OUT THAT WE NEED TO PULL AND STOW THE CANNON PLUG; WHICH WE DID AND THE ACFT LEFT. THE LACK OF GOOD COM; AND NOT LOOKING AT THE MEL OURSELVES; CAUSED THE PROB.
Data retrieved from NASA's ASRS site as of January 2009 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.