PC-12
Aircraft Equipment Problem Critical
Flight Crew Diverted; Flight Crew Executed Go Around / Missed Approach; General Maintenance Action
Aircraft
We were flying a repositioning leg and the first officer was on his 2nd day of IOE. The first officer was acting as pilot flying. Upon selecting landing gear down; the landing gear failed to extend; and three red gear unsafe lights illuminated. I did not hear the hydraulic pump running as usual. After a period of approximately 35-40 seconds; the two main gear indicators changed to green; the nose gear indicator remained red; and a HYDR CAWS illuminated. I directed the first officer to perform a go-around / missed approach; climb to 4;500; engage the autopilot; and continue flying the aircraft in VMC. After reaching a safe altitude; I performed the HYDR CAWS QRH procedure. The HYDR CNTL circuit breaker was pulled as per the checklist. As directed by the QRH; we referred to the 'Emergency Landing Gear Extension' checklist in the QRH. The nose gear locked into place within 30 seconds of reducing airspeed to 110 KIAS. No use of the hand pump was required. The gear was left extended. With adequate fuel; VMC conditions; and no checklist requirement to land as soon as practical or possible; we chose to divert to where there is a Pilatus service center. This was approximately 100nm away; and we flew there IFR in VMC with the gear extended. Airspeed was maintained below 177 KIAS as required by the HYDR CAWS checklist. Landing was without incident.
PC-12 Captain reports failure of the landing gear to extend when selected down during approach. QRH procedures are applied and three green lights are observed; but the crew elects to divert to an airport where maintenance is available.