CL65 crew was operating a company assigned flight test which called for the air driven generator to be deployed. Crew discovered their navigation lights were unpwred.

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Attributes
ACN	535433
Time
Date	200201
Day	Mon
Local Time Of Day	1201 To 1800
Place
Locale Reference	atc facility : zlc.artcc
State Reference	UT
Altitude	msl single value : 31000
Environment
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zlc.artcc tower : zzz.tower
Operator	common carrier : air carrier
Make Model Name	B737-300
Operating Under FAR Part	Part 121
Flight Phase	cruise : level
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
ASRS Report	535333
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Events
Anomaly	aircraft equipment problem : critical other anomaly other anomaly
Independent Detector	other other : 3
Resolutory Action	controller : issued new clearance controller : provided flight assist flight crew : landed in emergency condition flight crew : declared emergency none taken : detected after the fact
Consequence	other other
Supplementary
Problem Areas	Aircraft
Primary Problem	Aircraft

Narrative:

On maintenance flight for air carrier, while doing an air driven generator deployment flight, I realized that while the air driven generator was the sole source of power, our navigation lights were not on. When main generators came back on, navigation lights came back on. Have told the company of the problem with no navs during air driven generator deployment. Don't know what corrective action will be taken.

Original NASA ASRS Text

Title: CL65 CREW WAS OPERATING A COMPANY ASSIGNED FLT TEST WHICH CALLED FOR THE AIR DRIVEN GENERATOR TO BE DEPLOYED. CREW DISCOVERED THEIR NAV LIGHTS WERE UNPWRED.

Narrative: ON MAINT FLT FOR ACR, WHILE DOING AN AIR DRIVEN GENERATOR DEPLOYMENT FLT, I REALIZED THAT WHILE THE AIR DRIVEN GENERATOR WAS THE SOLE SOURCE OF PWR, OUR NAV LIGHTS WERE NOT ON. WHEN MAIN GENERATORS CAME BACK ON, NAV LIGHTS CAME BACK ON. HAVE TOLD THE COMPANY OF THE PROB WITH NO NAVS DURING AIR DRIVEN GENERATOR DEPLOYMENT. DON'T KNOW WHAT CORRECTIVE ACTION WILL BE TAKEN.

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.