Two mechanics and one inspector describe a chain of events that ended with damage to a B737-700 airc...

Attributes
ACN	970997
Time
Date	201109
Local Time Of Day	1801-2400
Place
Locale Reference	ZZZ.Airport
State Reference	US
Environment
Light	Night
Aircraft 1
Make Model Name	B737-700
Operating Under FAR Part	Part 121
Flight Phase	Parked
Component
Aircraft Component	Main Gear
Person 1
Function	Technician
Qualification	Maintenance Airframe Maintenance Powerplant
Person 2
Function	Inspector
Qualification	Maintenance Powerplant Maintenance Airframe
Events
Anomaly	Aircraft Equipment Problem Critical Deviation - Procedural Published Material / Policy

Narrative:

I came in on my regular shift and was given my job assignment to remove an unserviceable left main gear hanger link and lower bushings. This was my first time on project and I came in on the job when all safety bolts; including apex bolt for the upper and lower side strut; hanger link pins upper and lower nuts and their safety hi-locks and collars [were already] removed and laying on the table. I removed hanger link and its lower bushings and installed new bushings and hanger link. Installed new lower hanger link pin and completed the job. I inadvertently installed the upper and lower side strut apex bolt improperly. I misinterpreted maintenance manual (M/M) and engineering authorization (ea).

Original NASA ASRS Text

Title: Two mechanics and one Inspector describe a chain of events that ended with damage to a B737-700 aircraft from an incorrect installation and orientation of an Apex bolt that connected the upper and lower side struts on the right main landing gear.

Narrative: I came in on my regular shift and was given my job assignment to remove an unserviceable left main gear hanger link and lower bushings. This was my first time on project and I came in on the job when all safety bolts; including Apex bolt for the upper and lower side strut; hanger link pins upper and lower nuts and their safety hi-locks and collars [were already] removed and laying on the table. I removed hanger link and its lower bushings and installed new bushings and hanger link. Installed new lower hanger link pin and completed the job. I inadvertently installed the upper and lower side strut Apex bolt improperly. I misinterpreted Maintenance Manual (M/M) and Engineering Authorization (EA).

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.

Two mechanics and one inspector describe a chain of events that ended with damage to a B737-700 aircraft from an incorrect installation and orientation of an apex bolt that connected the upper and lower side struts on the right main landing gear.