B737-700 flight crew reported returning to departure airport following loss of number 1 CSD.

Attributes
ACN	1310203
Time
Date	201511
Local Time Of Day	1201-1800
Place
Locale Reference	ZZZ.Airport
State Reference	US
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Make Model Name	B737-700
Operating Under FAR Part	Part 121
Flight Phase	Takeoff
Flight Plan	IFR
Component
Aircraft Component	Generator Drive
Person 1
Function	Pilot Flying Captain
Qualification	Flight Crew Air Transport Pilot (ATP)
Experience	Flight Crew Last 90 Days 177 Flight Crew Type 8000
Person 2
Function	Pilot Not Flying First Officer
Qualification	Flight Crew Air Transport Pilot (ATP)
Experience	Flight Crew Last 90 Days 68
Events
Anomaly	Aircraft Equipment Problem Less Severe

Narrative:

Continued takeoff after a master caution light and an electrical indication at approximately 120 knots. Continued to climb via the SID and cleaned up normally. Once established in the climb; we completed the source off QRH and started the APU and brought it online. Once we were complete and checked the overhead again; I noticed the number 1 drive light was now illuminated. We leveled off and completed the drive light QRH.after completing the non-normal procedures; we assessed our fuel state to continue and decided the safest course of action was to return to [departure airport]. We returned and were met by maintenance. We pushed off the gate at minimum planned fuel and took off with just above minimum takeoff fuel.

Original NASA ASRS Text

Title: B737-700 flight crew reported returning to departure airport following loss of Number 1 CSD.

Narrative: Continued takeoff after a master caution light and an electrical indication at approximately 120 knots. Continued to climb via the SID and cleaned up normally. Once established in the climb; we completed the source off QRH and started the APU and brought it online. Once we were complete and checked the overhead again; I noticed the Number 1 drive light was now illuminated. We leveled off and completed the drive light QRH.After completing the non-normal procedures; we assessed our fuel state to continue and decided the safest course of action was to return to [departure airport]. We returned and were met by Maintenance. We pushed off the gate at minimum planned fuel and took off with just above minimum takeoff fuel.

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.