<< >> NASA ASRS Report 1298849, September 2015

B737 flight crew reported observing a master caution 'elec' warning light. They noted that one of the generator drive units indicated an elevated temperature; but without the associated warning light. They landed uneventfully and discovered during post flight troubleshooting that several bulbs were missing from the annunciator panel.

Attributes
ACN	1298849
Time
Date	201509
Local Time Of Day	0601-1200
Place
Locale Reference	ZZZ.ARTCC
State Reference	US
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Make Model Name	B737 Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Flight Phase	Climb
Flight Plan	IFR
Component
Aircraft Component	Generator Drive
Person 1
Function	Captain
Qualification	Flight Crew Air Transport Pilot (ATP)
Experience	Flight Crew Last 90 Days 219 Flight Crew Type 8000
Person 2
Function	First Officer
Qualification	Flight Crew Air Transport Pilot (ATP)
Experience	Flight Crew Last 90 Days 173
Events
Anomaly	Aircraft Equipment Problem Less Severe Deviation - Procedural Published Material / Policy

Narrative:

In-flight; the master caution annunciation along with the 'elec' light on the system annunciator panel flickered. Upon further investigation; we discovered the number two gen drive oil temp was elevated. The 'high oil temp' light was not illuminated; even in the test mode. We checked all the circuit breakers and none were popped. We monitored the constant speed drive temperature for the remainder of the flight and started the APU as a precaution. We landed at our destination uneventfully. Contract maintenance met the aircraft and noted that the light bulbs were missing from the annunciator. The light bulbs were then replaced. We accomplished an 'engine run-up' to check the generator drive oil temp. As the temperature was still elevated; we accomplished the generator drive high oil temperature checklist in the QRH. Maintenance deferred the item and we continued on our trip with the MEL restrictions.

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Original NASA ASRS Text

Title: B737 flight crew reported observing a Master Caution 'ELEC' warning light. They noted that one of the generator drive units indicated an elevated temperature; but without the associated warning light. They landed uneventfully and discovered during post flight troubleshooting that several bulbs were missing from the annunciator panel.

Narrative: In-flight; the Master Caution annunciation along with the 'ELEC' light on the system annunciator panel flickered. Upon further investigation; we discovered the number two Gen Drive oil temp was elevated. The 'High Oil Temp' light was not illuminated; even in the test mode. We checked all the circuit breakers and none were popped. We monitored the Constant Speed Drive temperature for the remainder of the flight and started the APU as a precaution. We landed at our destination uneventfully. Contract Maintenance met the aircraft and noted that the light bulbs were missing from the annunciator. The light bulbs were then replaced. We accomplished an 'engine run-up' to check the Generator Drive oil temp. As the temperature was still elevated; we accomplished the Generator Drive High Oil Temperature Checklist in the QRH. Maintenance deferred the item and we continued on our trip with the MEL restrictions.

Data retrieved from NASA's ASRS site 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.