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A B737-300 right engine aft mount had the mount bolt washer installed incorrectly. Engine lowered and washer reinstalled correctly.
| Attributes | |
| ACN | 674550 |
| Time | |
| Date | 200510 |
| 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 | B737-300 |
| Operating Under FAR Part | Part 121 |
| Flight Phase | ground : maintenance |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | maintenance : technician |
| Qualification | technician : airframe technician : powerplant |
| Experience | maintenance technician : 14 |
| ASRS Report | 674550 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | maintenance : lead technician |
| Events | |
| Anomaly | aircraft equipment problem : critical maintenance problem : improper documentation maintenance problem : improper maintenance non adherence : published procedure non adherence : far |
| Independent Detector | other other : 1 |
| Resolutory Action | none taken : detected after the fact |
| Consequence | other |
| Factors | |
| Maintenance | contributing factor : schedule pressure performance deficiency : installation performance deficiency : inspection performance deficiency : logbook entry performance deficiency : non compliance with legal requirements performance deficiency : scheduled maintenance |
| Supplementary | |
| Problem Areas | Aircraft Chart Or Publication Maintenance Human Performance |
| Primary Problem | Maintenance Human Performance |
Narrative:
On oct/sat/05; I was participating in an engine change on aircraft X. I incorrectly installed the aft mount washer on the #2 engine. There is a big side and a small side to the washer. The small side should face downward and mate with the locknut. I had the small side facing upward. On oct/wed/05; I ws installing a #1 engine on aircraft Y. It was at this time that I realized the mistake. I immediately notified my duty manager of the problem. The aircraft was located on the ground in ZZZ1. ZZZ1 maintenance was notified; an inspection performed which verified the incorrect installation. It was my understanding that ZZZ maintenance was going to lower the #2 engine and correct this condition immediately.
Original NASA ASRS Text
Title: A B737-300 R ENG AFT MOUNT HAD THE MOUNT BOLT WASHER INSTALLED INCORRECTLY. ENG LOWERED AND WASHER REINSTALLED CORRECTLY.
Narrative: ON OCT/SAT/05; I WAS PARTICIPATING IN AN ENG CHANGE ON ACFT X. I INCORRECTLY INSTALLED THE AFT MOUNT WASHER ON THE #2 ENG. THERE IS A BIG SIDE AND A SMALL SIDE TO THE WASHER. THE SMALL SIDE SHOULD FACE DOWNWARD AND MATE WITH THE LOCKNUT. I HAD THE SMALL SIDE FACING UPWARD. ON OCT/WED/05; I WS INSTALLING A #1 ENG ON ACFT Y. IT WAS AT THIS TIME THAT I REALIZED THE MISTAKE. I IMMEDIATELY NOTIFIED MY DUTY MGR OF THE PROB. THE ACFT WAS LOCATED ON THE GND IN ZZZ1. ZZZ1 MAINT WAS NOTIFIED; AN INSPECTION PERFORMED WHICH VERIFIED THE INCORRECT INSTALLATION. IT WAS MY UNDERSTANDING THAT ZZZ MAINT WAS GOING TO LOWER THE #2 ENG AND CORRECT THIS CONDITION IMMEDIATELY.
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.