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A B757-200 during an engine change the engine mounts were found frozen. Two engine shop technicians freed up mounts; but noted 2 cotter pins removed on forward mount. These pins are not normally to be removed. Needed engineering verification.
| Attributes | |
| ACN | 713801 |
| Time | |
| Date | 200610 |
| Place | |
| Locale Reference | airport : zzz.airport |
| State Reference | US |
| Altitude | agl single value : 0 |
| Aircraft 1 | |
| Controlling Facilities | tower : cid.tower |
| Operator | common carrier : air carrier |
| Make Model Name | B757 Undifferentiated or Other Model |
| Operating Under FAR Part | Part 121 |
| Flight Phase | ground : maintenance |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | maintenance : technician |
| ASRS Report | 713801 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | maintenance : technician |
| Events | |
| Anomaly | aircraft equipment problem : critical |
| Independent Detector | other other : 1 |
| Resolutory Action | none taken : detected after the fact |
| Consequence | other other |
| Factors | |
| Maintenance | contributing factor : work cards contributing factor : engineering procedure performance deficiency : repair |
| Supplementary | |
| Problem Areas | Chart Or Publication Aircraft Maintenance Human Performance |
| Primary Problem | Aircraft |
Narrative:
On oct/fri/06; I was sent on a field trip to address frozen (unmovable) engine mounts. Upon arrival the #2 engine scheduled for change was in its shipping stand. The mounts were stiff; but had movement; we noticed that several cotter pins had been removed from the dog bone links. We worked the mounts back and forth until they had full range of motion and installed the missing dog bone cotter pins. There are 2 other cotter pins on the forward mount used in its assembly that would normally not be removed. Engine parts catalog. We do not know if these were removed and request verification. Called maintenance control and had action to be taken placed in flight crew maintenance report for verification of cotter pins.
Original NASA ASRS Text
Title: A B757-200 DURING AN ENG CHANGE THE ENG MOUNTS WERE FOUND FROZEN. TWO ENG SHOP TECHNICIANS FREED UP MOUNTS; BUT NOTED 2 COTTER PINS REMOVED ON FORWARD MOUNT. THESE PINS ARE NOT NORMALLY TO BE REMOVED. NEEDED ENGINEERING VERIFICATION.
Narrative: ON OCT/FRI/06; I WAS SENT ON A FIELD TRIP TO ADDRESS FROZEN (UNMOVABLE) ENG MOUNTS. UPON ARR THE #2 ENG SCHEDULED FOR CHANGE WAS IN ITS SHIPPING STAND. THE MOUNTS WERE STIFF; BUT HAD MOVEMENT; WE NOTICED THAT SEVERAL COTTER PINS HAD BEEN REMOVED FROM THE DOG BONE LINKS. WE WORKED THE MOUNTS BACK AND FORTH UNTIL THEY HAD FULL RANGE OF MOTION AND INSTALLED THE MISSING DOG BONE COTTER PINS. THERE ARE 2 OTHER COTTER PINS ON THE FORWARD MOUNT USED IN ITS ASSEMBLY THAT WOULD NORMALLY NOT BE REMOVED. ENG PARTS CATALOG. WE DO NOT KNOW IF THESE WERE REMOVED AND REQUEST VERIFICATION. CALLED MAINT CTL AND HAD ACTION TO BE TAKEN PLACED IN FLT CREW MAINT RPT FOR VERIFICATION OF COTTER PINS.
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.