Learjet 60 captain reported dual generator failure; left engine computer master caution; and intermi...

Narrative:

We were IMC on initial descent in the high 20s or low 30s; between ZZZ and ZZZ1; going through some rain/ice and light; borderline moderate turbulence. The master caution flashed so I checked the annunciator panel and saw that both generator lights were on. I called my first officer's attention to it and told him it looks like we have a dual generator failure and called for the generator fail checklist. I also called center and [advised them] and requested assistance with weather as we focused on the aircraft. We completed the checklist; which included reducing the electrical load. I only had cabin fans and lights to turn off. With the icing conditions I did not want to risk turning off any anti-ice. The checklist had us press the generator reset buttons; and when we did; both generators came back on line. I confirmed with seeing 28 vdc on the eis. Shortly after; we got an amber stab heat annunciator; showing there was a disagreement and may not be working. We did the stab heat light checklist. At some point around then; I don't remember exact timing; we got a white left engine computer light and an aural alarm of some sort. We did not know what the alarm was and could not find a way to mute it. We completed the checklist for the engine computer light.in the meantime we were descended further by ATC and ended up in the clear with layers above and below. I turned off the anti-ice after a couple of minutes and addressed my passengers. We still could not determine what the alarm was. Prior to entering the layers below us; I turned the anti-ice back on; and the stab heat light did not come on; indicating it was working. With all systems appearing to be working as they should be; I advised ATC that I was expecting a normal landing and [advising them] was more precautionary at this point. We landed without incident and the alarm finally stopped when I turned off the main batteries after engine shutdown. We have since determined the alarm was the selcal going off; however; I don't know what set it off.

Original NASA ASRS Text

Title: Learjet 60 Captain reported dual generator failure; left engine computer master caution; and intermittent stab heat fail in descent through clouds and icing.

Narrative: We were IMC on initial descent in the high 20s or low 30s; between ZZZ and ZZZ1; going through some rain/ice and light; borderline moderate turbulence. The Master Caution flashed so I checked the annunciator panel and saw that both generator lights were on. I called my First Officer's attention to it and told him it looks like we have a dual generator failure and called for the generator fail checklist. I also called Center and [advised them] and requested assistance with weather as we focused on the aircraft. We completed the checklist; which included reducing the electrical load. I only had cabin fans and lights to turn off. With the icing conditions I did not want to risk turning off any anti-ice. The checklist had us press the generator reset buttons; and when we did; both generators came back on line. I confirmed with seeing 28 VDC on the EIS. Shortly after; we got an amber Stab Heat annunciator; showing there was a disagreement and may not be working. We did the Stab Heat light checklist. At some point around then; I don't remember exact timing; we got a white L ENG COMPUTER light and an aural alarm of some sort. We did not know what the alarm was and could not find a way to mute it. We completed the checklist for the engine computer light.In the meantime we were descended further by ATC and ended up in the clear with layers above and below. I turned off the anti-ice after a couple of minutes and addressed my passengers. We still could not determine what the alarm was. Prior to entering the layers below us; I turned the anti-ice back on; and the Stab Heat light did not come on; indicating it was working. With all systems appearing to be working as they should be; I advised ATC that I was expecting a normal landing and [advising them] was more precautionary at this point. We landed without incident and the alarm finally stopped when I turned off the main batteries after engine shutdown. We have since determined the alarm was the SelCal going off; however; I don't know what set it off.

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.

Attributes
ACN	1650460
Time
Date	201905
Local Time Of Day	1201-1800
Place
Locale Reference	ZZZ.Airport
State Reference	US
Environment
Flight Conditions	IMC
Light	Daylight
Aircraft 1
Make Model Name	Learjet 60
Operating Under FAR Part	Part 135
Flight Phase	Descent
Route In Use	Direct
Flight Plan	IFR
Component
Aircraft Component	Generator Drive
Person 1
Function	Captain
Qualification	Flight Crew Flight Instructor Flight Crew Instrument Flight Crew Multiengine Flight Crew Air Transport Pilot (ATP)
Experience	Flight Crew Last 90 Days 35 Flight Crew Total 2800 Flight Crew Type 667
Events
Anomaly	Aircraft Equipment Problem Critical Inflight Event / Encounter Weather / Turbulence

Learjet 60 captain reported dual generator failure; left engine computer master caution; and intermittent stab heat fail in descent through clouds and icing.