A maintenance supervisor reports about a B757-200 diverting due to a strong burning odor coming from...

Attributes
ACN	920251
Time
Date	201010
Local Time Of Day	0601-1200
Place
Locale Reference	ZZZ.Airport
State Reference	US
Environment
Light	Daylight
Aircraft 1
Make Model Name	B757-200
Operating Under FAR Part	Part 121
Flight Phase	Climb
Component
Aircraft Component	Pax Seat
Person 1
Function	Other / Unknown
Qualification	Maintenance Airframe Maintenance Powerplant
Experience	Maintenance Technician 25
Events
Anomaly	Aircraft Equipment Problem Critical Deviation - Procedural FAR Deviation - Procedural Published Material / Policy Flight Deck / Cabin / Aircraft Event Smoke / Fire / Fumes / Odor

Narrative:

Logbook item: strong odor; B757-200 came back after power had been disconnected. Fire chief confirmed with thermal imaging that wire was disconnected; [but] was still warm. Repair took place in ZZZ.found [passenger seat] vacuum motor lumber bag (cover) burnt. Found that [vacuum motor] wire harness was routed incorrectly causing the harness to short out. Removed and replaced vacuum motor and replaced wire harness. [I] accomplished task using (component maintenance manual) cmm 25-20-77; page 7007.suggest when installing or replacing vacuum motor and harness; make sure wire harness is properly routed so that wire harness will not chafe or short out. Also use proper manual such as the cmm for correct instructions.

Original NASA ASRS Text

Title: A Maintenance Supervisor reports about a B757-200 diverting due to a strong burning odor coming from a First Class seat. The electrical wiring harness for the seat lumbar support inflation bag had been incorrectly routed inside the motor covering.

Narrative: Logbook item: strong odor; B757-200 came back after power had been disconnected. Fire Chief confirmed with thermal imaging that wire was disconnected; [but] was still warm. Repair took place in ZZZ.Found [passenger seat] vacuum motor lumber bag (cover) burnt. Found that [vacuum motor] wire harness was routed incorrectly causing the harness to short out. Removed and replaced vacuum motor and replaced wire harness. [I] accomplished task using (Component Maintenance Manual) CMM 25-20-77; page 7007.Suggest when installing or replacing vacuum motor and harness; make sure wire harness is properly routed so that wire harness will not chafe or short out. Also use proper manual such as the CMM for correct instructions.

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.

A maintenance supervisor reports about a B757-200 diverting due to a strong burning odor coming from a first class seat. The electrical wiring harness for the seat lumbar support inflation bag had been incorrectly routed inside the motor covering.