<< >> NASA ASRS Report 677419, November 2005

A B737-300 start switch was replaced and 1 day later after 2 flts and 2 maintenance related engine runs; the #2 engine starter circuit breaker tripped.

Attributes
ACN	677419
Time
Date	200511
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : zzz.airport
State Reference	US
Altitude	agl single value : 0
Environment
Light	Daylight
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
ASRS Report	677419
Person 2
Affiliation	company : air carrier
Function	maintenance : technician
Qualification	technician : powerplant technician : airframe
ASRS Report	677420
Events
Anomaly	aircraft equipment problem : critical
Independent Detector	aircraft equipment other aircraft equipment : circuit breaker tripped other other : 1
Resolutory Action	none taken : detected after the fact
Factors
Maintenance	contributing factor : schedule pressure performance deficiency : repair performance deficiency : testing performance deficiency : fault isolation
Supplementary
Problem Areas	Maintenance Human Performance Environmental Factor Aircraft
Primary Problem	Aircraft

Narrative:

On nov/sat/05; at approximately XA15; I was requested to assist technician Y with a #2 engine start switch replacement on aircraft. We replaced the switch together; removing and installing the wires one at a time; verifying security of the wire attach screws twice and inspecting installation area for loose hardware or other anomalies. After securing the overhead panel; technician Y performed an operations check while I started the logbook entry. Aircraft pushed back; air crew started the engines and departed. On the following day; after 2 flts; a maintenance leak check run and a maintenance repos taxi; the #2 start circuit breaker popped after pushback for flight.

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Original NASA ASRS Text

Title: A B737-300 START SWITCH WAS REPLACED AND 1 DAY LATER AFTER 2 FLTS AND 2 MAINT RELATED ENG RUNS; THE #2 ENG STARTER CIRCUIT BREAKER TRIPPED.

Narrative: ON NOV/SAT/05; AT APPROX XA15; I WAS REQUESTED TO ASSIST TECHNICIAN Y WITH A #2 ENG START SWITCH REPLACEMENT ON ACFT. WE REPLACED THE SWITCH TOGETHER; REMOVING AND INSTALLING THE WIRES ONE AT A TIME; VERIFYING SECURITY OF THE WIRE ATTACH SCREWS TWICE AND INSPECTING INSTALLATION AREA FOR LOOSE HARDWARE OR OTHER ANOMALIES. AFTER SECURING THE OVERHEAD PANEL; TECHNICIAN Y PERFORMED AN OPS CHK WHILE I STARTED THE LOGBOOK ENTRY. ACFT PUSHED BACK; AIR CREW STARTED THE ENGS AND DEPARTED. ON THE FOLLOWING DAY; AFTER 2 FLTS; A MAINT LEAK CHK RUN AND A MAINT REPOS TAXI; THE #2 START CIRCUIT BREAKER POPPED AFTER PUSHBACK FOR FLT.

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.