Mdt aircraft has air driven generator deploy in-flight when shutting down the APU. On inspection it was noted that both engine generator switches were in the off position.

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Attributes
ACN	343806
Time
Date	199608
Day	Fri
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : hpn
State Reference	NY
Altitude	agl bound lower : 1500 agl bound upper : 1500
Environment
Flight Conditions	VMC
Light	Dawn
Aircraft 1
Controlling Facilities	tracon : n90 tower : hou
Operator	common carrier : air carrier
Make Model Name	Commercial Fixed Wing
Operating Under FAR Part	Part 121
Navigation In Use	Other Other
Flight Phase	climbout : initial climbout : takeoff
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : instrument pilot : flight engineer pilot : atp pilot : commercial
Experience	flight time last 90 days : 60 flight time total : 10000 flight time type : 60
ASRS Report	343806
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Events
Anomaly	aircraft equipment problem : less severe other anomaly other
Independent Detector	aircraft equipment other aircraft equipment : unspecified other flight crewa
Resolutory Action	flight crew : overcame equipment problem other
Consequence	Other
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

Air driven generator deployed in-flight when APU was shut down in the climb checklist. Requested to return to hpn airport. No emergency involved. As air driven generator deployed the first officer (PNF) saw that both engine generator switches were in the (back) off position. They were immediately moved (forward) to on. Essential power transferred to main AC bus and an uneventful approach and landing followed.

Original NASA ASRS Text

Title: MDT ACFT HAS AIR DRIVEN GENERATOR DEPLOY INFLT WHEN SHUTTING DOWN THE APU. ON INSPECTION IT WAS NOTED THAT BOTH ENG GENERATOR SWITCHES WERE IN THE OFF POS.

Narrative: AIR DRIVEN GENERATOR DEPLOYED INFLT WHEN APU WAS SHUT DOWN IN THE CLB CHKLIST. REQUESTED TO RETURN TO HPN ARPT. NO EMER INVOLVED. AS AIR DRIVEN GENERATOR DEPLOYED THE FO (PNF) SAW THAT BOTH ENG GENERATOR SWITCHES WERE IN THE (BACK) OFF POS. THEY WERE IMMEDIATELY MOVED (FORWARD) TO ON. ESSENTIAL PWR TRANSFERRED TO MAIN AC BUS AND AN UNEVENTFUL APCH AND LNDG FOLLOWED.

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.