Flight Crew Air Transport Pilot (ATP); Flight Crew Multiengine; Flight Crew Instrument; Flight Crew Flight Instructor
Flight Crew Last 90 Days 75; Flight Crew Total 4400; Flight Crew Type 1500
Aircraft Equipment Problem Less Severe
Air Traffic Control Issued New Clearance; Air Traffic Control Provided Assistance; Flight Crew Executed Go Around / Missed Approach; Flight Crew Landed in Emergency Condition; Flight Crew Overcame Equipment Problem
Aircraft
We were flying the ILS Runaway 06 into ZZZ. The approach was uneventful until landing gear extension. Upon selecting landing gear down; we received an amber HYD PTU failure CAS message. Then we received a RED GEAR CAS message along with a GEAR Voice message. We then noticed that only the nose gear was indicating down and locked with both main landing gear indicator cross-hatched (Indicating Gear unsafe). At this point; a go-around was started at approximately a 2-mile final. We were instructed to execute the published missed approach procedure. The landing gear and flaps retracted normally and the warning horn and previous CAS messages went away. After getting handed off to Approach Control; I requested delay vectors and an altitude assignment as opposed to doing the published hold. Once level; the only remaining CAS message was a cyan 'L ENG HYD PUMP FAIL'. We then elected to do the emergency gear extension checklist. What prompted us to that checklist was the previous RED GEAR CAS message. That checklist calls for the landing gear handle switch to be selected down. All three landing gear extended normally; with three green indicator lights. We elected to keep the gear down for the remainder of the flight. Since we were having a problem with the left side hydraulic system; which controls the gear extension and nose wheel steering; we were concerned about taxiing off the runway after landing rollout. I then contacted Tower and told them we were eventually going to be coming back in for another landing attempt; but there was a possibility we would not have full nose-wheel steering and may have to be towed off the runway. We set up the approach and ran the checklist for Approach and Before Landing. The fight concluded with a normal landing along with full nose wheel steering ability. Once we were parked; I pulled up the Hydraulic-system schematic on the MFD. The left side hydraulic system reservoir showed 0 percent quantity remaining.
CL30 First Officer reported that an emergency gear extension procedure was used due to a hydraulic pump failure. Landing and taxi were uneventful.