RA-390 (premier) captain reported landing gear would not extend with normal system; but was successf...

Narrative:

As the pilot not flying; on approximately a 7 mile final (visual approach) for runway 23R at tys; on command from the pilot flying; I moved the gear handle to the extend position. Nothing happened. We cycled the gear handle several times to no avail. We leveled off at pattern altitude (2;500 feet MSL) and with permission from knoxville tower; we overflew the runway and entered right traffic for runway 23R. We then worked through the alternate gear extension checklist and successfully extended the gear with a '3 green' down and locked indication. The tower visually verified the gear appeared down. A byproduct of the alternate gear extension procedure is that the inboard gear doors do not retract (that is; when there is not a normal electrical circuit to the gear system; which appeared to be the problem). We landed uneventfully but damaged the inboard gear doors as they dragged on the pavement. I am told both inboard gear doors will have to be replaced. With permission from the tower after clearing the runway; I exited the airplane to manually close the inboard gear doors so that we could taxi the airplane to the ramp without further damage to the gear doors.there seems to be a problem with the electrical signal to the gear system. Maintenance will have to troubleshoot the gear system to isolate the actual problem. We followed procedures as trained.

Original NASA ASRS Text

Title: RA-390 (Premier) Captain reported landing gear would not extend with normal system; but was successfully deployed with the alternate system. Some damage to gear doors resulted; since they do not retract when alternate is used.

Narrative: As the pilot not flying; on approximately a 7 mile final (visual approach) for runway 23R at TYS; on command from the pilot flying; I moved the gear handle to the extend position. Nothing happened. We cycled the gear handle several times to no avail. We leveled off at pattern altitude (2;500 feet MSL) and with permission from Knoxville tower; we overflew the runway and entered right traffic for runway 23R. We then worked through the Alternate Gear Extension checklist and successfully extended the gear with a '3 green' down and locked indication. The tower visually verified the gear appeared down. A byproduct of the alternate gear extension procedure is that the inboard gear doors do not retract (that is; when there is not a normal electrical circuit to the gear system; which appeared to be the problem). We landed uneventfully but damaged the inboard gear doors as they dragged on the pavement. I am told both inboard gear doors will have to be replaced. With permission from the tower after clearing the runway; I exited the airplane to manually close the inboard gear doors so that we could taxi the airplane to the ramp without further damage to the gear doors.There seems to be a problem with the electrical signal to the gear system. Maintenance will have to troubleshoot the gear system to isolate the actual problem. We followed procedures as trained.

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	1224311
Time
Date	201412
Local Time Of Day	0601-1200
Place
Locale Reference	TYS.Airport
State Reference	TN
Aircraft 1
Make Model Name	Premier 1
Operating Under FAR Part	Part 91
Flight Phase	Final Approach
Route In Use	Visual Approach
Flight Plan	IFR
Component
Aircraft Component	Gear Extend/Retract Mechanism
Person 1
Function	Captain Pilot Not Flying
Qualification	Flight Crew Flight Instructor Flight Crew Air Transport Pilot (ATP) Flight Crew Instrument Flight Crew Multiengine
Experience	Flight Crew Last 90 Days 100 Flight Crew Total 10000 Flight Crew Type 2570
Events
Anomaly	Aircraft Equipment Problem Less Severe Ground Event / Encounter Other / Unknown

RA-390 (premier) captain reported landing gear would not extend with normal system; but was successfully deployed with the alternate system. Some damage to gear doors resulted; since they do not retract when alternate is used.