Two maintenance base mechanics report how a false indication of applied torque to a seat row locking...

Attributes
ACN	1057306
Time
Date	201212
Local Time Of Day	1201-1800
Place
Locale Reference	ZZZ.Airport
State Reference	US
Environment
Light	Daylight
Aircraft 1
Make Model Name	B777-200
Operating Under FAR Part	Part 121
Flight Phase	Parked
Component
Aircraft Component	Pax Seat
Person 1
Function	Technician
Qualification	Maintenance Airframe Maintenance Powerplant
Person 2
Function	Technician
Qualification	Maintenance Airframe Maintenance Powerplant
Events
Anomaly	Aircraft Equipment Problem Critical Deviation - Procedural Published Material / Policy Flight Deck / Cabin / Aircraft Event Other / Unknown

Narrative:

I was installing coach passenger seats on a B777-200 aircraft aft center rows xx; yy and zz; with a partner (mechanic) on november 2012. I was working on the left side [of the center rows]; partner on the right. The left side installation went okay. But the right side seat track had debris inside and carpet that came close to edge of the seat track. Seat row-zz was the most difficult to install and required two people install. One person to push on seat to align and the other to tighten shear pin. I was pushing seat into position while partner was tightening shear pin. Shear pin contacted edge of seat track and gave a false indication of applied torque. Seat came loose during a trip and was later fixed at a line station. Rows xx and yy were okay and no other problems noted. ETOPS aircraft.

Original NASA ASRS Text

Title: Two Maintenance Base mechanics report how a false indication of applied torque to a seat row locking shear pin contributed to a B777-200 coach passenger seat coming loose from a floor track in flight.

Narrative: I was installing coach passenger seats on a B777-200 aircraft Aft Center Rows XX; YY and ZZ; with a Partner (Mechanic) on November 2012. I was working on the left side [of the Center rows]; Partner on the right. The left side installation went okay. But the right side seat track had debris inside and carpet that came close to edge of the seat track. Seat Row-ZZ was the most difficult to install and required two people install. One person to push on seat to align and the other to tighten shear pin. I was pushing seat into position while partner was tightening shear pin. Shear pin contacted edge of seat track and gave a false indication of applied torque. Seat came loose during a trip and was later fixed at a Line Station. Rows XX and YY were okay and no other problems noted. ETOPS aircraft.

Data retrieved from NASA's ASRS site as of July 2013 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 maintenance base mechanics report how a false indication of applied torque to a seat row locking shear pin contributed to a B777-200 coach passenger seat coming loose from a floor track in flight.