A mechanic may have installed a generator control box improperly.

Attributes
ACN	266743
Time
Date	199403
Day	Tue
Local Time Of Day	0001 To 0600
Place
Locale Reference	airport : den
State Reference	CO
Altitude	agl bound lower : 0 agl bound upper : 0
Environment
Light	Night
Aircraft 1
Operator	common carrier : air carrier
Make Model Name	Commercial Fixed Wing
Operating Under FAR Part	Part 121
Navigation In Use	Other Other
Flight Phase	ground : preflight
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	other personnel other
Qualification	other other : other
ASRS Report	266743
Person 2
Affiliation	company : air carrier
Function	other personnel other
Qualification	other other : other
Events
Anomaly	aircraft equipment problem : critical
Independent Detector	other flight crewa
Resolutory Action	other
Consequence	Other
Supplementary
Primary Problem	Aircraft
Air Traffic Incident	other

Narrative:

On mar/tue/94 an overnight aircraft had a gripe. The frequency on #2 generator was out of limits. I replaced and secured #2 generator control unit. An operations check was done. Started both engines. The frequency on engine #2 was still out of limits. Then turned over to the airframe and pwrplant mechanic. Changed out the generator and the CSD. An operations check was done and the job signed off as ok. When I replaced the generator control box, I racked it in by hand to align the pins and socket and secure the box by locking the latch. Nothing out of the ordinary was noticed by me. Confident of a job done, I left the aircraft and signed off my work.

Original NASA ASRS Text

Title: A MECH MAY HAVE INSTALLED A GENERATOR CTL BOX IMPROPERLY.

Narrative: ON MAR/TUE/94 AN OVERNIGHT ACFT HAD A GRIPE. THE FREQ ON #2 GENERATOR WAS OUT OF LIMITS. I REPLACED AND SECURED #2 GENERATOR CTL UNIT. AN OPS CHK WAS DONE. STARTED BOTH ENGS. THE FREQ ON ENG #2 WAS STILL OUT OF LIMITS. THEN TURNED OVER TO THE AIRFRAME AND PWRPLANT MECH. CHANGED OUT THE GENERATOR AND THE CSD. AN OPS CHK WAS DONE AND THE JOB SIGNED OFF AS OK. WHEN I REPLACED THE GENERATOR CTL BOX, I RACKED IT IN BY HAND TO ALIGN THE PINS AND SOCKET AND SECURE THE BOX BY LOCKING THE LATCH. NOTHING OUT OF THE ORDINARY WAS NOTICED BY ME. CONFIDENT OF A JOB DONE, I LEFT THE ACFT AND SIGNED OFF MY WORK.

Data retrieved from NASA's ASRS site as of July 2007 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.