DA62 pilot reported a design deficiency in the aircraft lighting dimmer system resulted in an errone...

Attributes
ACN	1605535
Time
Date	201812
Local Time Of Day	0601-1200
Place
Locale Reference	ZZZ.Airport
State Reference	US
Environment
Flight Conditions	VMC
Light	Night
Aircraft 1
Make Model Name	DA62
Operating Under FAR Part	Part 91
Flight Phase	Final Approach
Flight Plan	IFR
Component
Aircraft Component	Landing Gear Indicating System
Person 1
Function	Single Pilot Pilot Flying
Qualification	Flight Crew Commercial Flight Crew Instrument Flight Crew Multiengine
Experience	Flight Crew Last 90 Days 71 Flight Crew Total 1374 Flight Crew Type 77
Events
Anomaly	Aircraft Equipment Problem Less Severe Flight Deck / Cabin / Aircraft Event Other / Unknown

Narrative:

I was on the ILS xx into ZZZ during a night flight on an IFR flight plan in VMC conditions. When I put the gear handle down; I heard the gear lower but I did not get 3 green light indication. I quickly referenced and executed the failed gear check list and [notified ATC] on tower frequency when the gear lights still failed to illuminate. I asked to do a low pass by the tower for a visual check on the gear; and was granted permission. Tower said that it appeared my gear was down. I asked tower to send a truck to the approach end of xx to tell me if they could see my gear when I got to short final; and they agreed to do that. I was handed back to approach and was vectored back around to the ILS xx. While on short final the truck said they could see my gear down. I made a normal landing and taxied back to my hangar without incident.I later learned that there is a bug in the DA62 that is not described in the afm. If you dim the G1000 screens at all then the 3 green landing lights do not illuminate when the gear is lowered. I had the screens dimmed slightly; which apparently prevented the landing [gear] lights from illuminating. I was unaware of this glitch; now I know.

Original NASA ASRS Text

Title: DA62 pilot reported a design deficiency in the aircraft lighting dimmer system resulted in an erroneous gear indication.

Narrative: I was on the ILS XX into ZZZ during a night flight on an IFR flight plan in VMC conditions. When I put the gear handle down; I heard the gear lower but I did not get 3 green light indication. I quickly referenced and executed the failed gear check list and [notified ATC] on tower frequency when the gear lights still failed to illuminate. I asked to do a low pass by the tower for a visual check on the gear; and was granted permission. Tower said that it appeared my gear was down. I asked tower to send a truck to the approach end of XX to tell me if they could see my gear when I got to short final; and they agreed to do that. I was handed back to Approach and was vectored back around to the ILS XX. While on short final the truck said they could see my gear down. I made a normal landing and taxied back to my hangar without incident.I later learned that there is a bug in the DA62 that is not described in the AFM. If you dim the G1000 screens at all then the 3 green landing lights do not illuminate when the gear is lowered. I had the screens dimmed slightly; which apparently prevented the landing [gear] lights from illuminating. I was unaware of this glitch; now I know.

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.