The crew of a G2 loses both generators and diverts to lnk, northeast.

Attributes
ACN	557615
Time
Date	200208
Day	Mon
Local Time Of Day	1201 To 1800
Place
Locale Reference	navaid : lnk.vortac
State Reference	NE
Altitude	msl single value : 41000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zmp.artcc
Operator	general aviation : personal
Make Model Name	Gulfstream II
Operating Under FAR Part	Part 91
Navigation In Use	other
Flight Phase	cruise : level
Flight Plan	IFR
Aircraft 2
Controlling Facilities	artcc : zmp.artcc
Operator	common carrier : air carrier
Make Model Name	Commercial Fixed Wing
Operating Under FAR Part	Part 121
Flight Phase	cruise : level
Person 1
Affiliation	other
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 60 flight time total : 6000 flight time type : 2500
ASRS Report	557615
Person 2
Affiliation	other
Function	flight crew : first officer
Events
Anomaly	aircraft equipment problem : critical other anomaly other
Independent Detector	other flight crewa other flight crewb
Resolutory Action	controller : issued new clearance controller : provided flight assist flight crew : diverted to another airport flight crew : landed in emergency condition
Consequence	other
Supplementary
Problem Areas	Flight Crew Human Performance Aircraft
Primary Problem	Aircraft

Narrative:

We were in cruise flight at FL410 when we lost both dc generators. We lost communication with ZMP because we lost the radio frequency. When power was lost, we went to back up power, which was transformer to ess power and battery to emergency position. We got back our #1 communication radio and tuned it to 121.5 and made contact with airliners, not able to reach a flight service station. Told airliner our situation and asked for help on getting a center frequency, which they did. Got in touch with ZMP and told them we needed to land and asked for the nearest airport. Landed in lnk with no problems, but noticed batteries were down to 22 volts. When we rolled out, they should have been charging from the transformer rectifier, but did not. Could not start our APU because of low batteries. We did not declare an emergency, but center did. Turned out to be a bad left generator which spiked right generator, causing it to kick off.

Original NASA ASRS Text

Title: THE CREW OF A G2 LOSES BOTH GENERATORS AND DIVERTS TO LNK, NE.

Narrative: WE WERE IN CRUISE FLT AT FL410 WHEN WE LOST BOTH DC GENERATORS. WE LOST COM WITH ZMP BECAUSE WE LOST THE RADIO FREQ. WHEN PWR WAS LOST, WE WENT TO BACK UP PWR, WHICH WAS TRANSFORMER TO ESS PWR AND BATTERY TO EMER POS. WE GOT BACK OUR #1 COM RADIO AND TUNED IT TO 121.5 AND MADE CONTACT WITH AIRLINERS, NOT ABLE TO REACH A FLT SVC STATION. TOLD AIRLINER OUR SIT AND ASKED FOR HELP ON GETTING A CTR FREQ, WHICH THEY DID. GOT IN TOUCH WITH ZMP AND TOLD THEM WE NEEDED TO LAND AND ASKED FOR THE NEAREST ARPT. LANDED IN LNK WITH NO PROBS, BUT NOTICED BATTERIES WERE DOWN TO 22 VOLTS. WHEN WE ROLLED OUT, THEY SHOULD HAVE BEEN CHARGING FROM THE TRANSFORMER RECTIFIER, BUT DID NOT. COULD NOT START OUR APU BECAUSE OF LOW BATTERIES. WE DID NOT DECLARE AN EMER, BUT CTR DID. TURNED OUT TO BE A BAD L GENERATOR WHICH SPIKED R GENERATOR, CAUSING IT TO KICK OFF.

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.