Date: 201505
Local time of day: 0601-1200
Location: ZZZ.Airport, US
Aircraft: Gulfstream G200 (IAI 1126 Galaxy)
Operator: Fractional
Operating under: Part 91
Flight plan: IFR
Mission: Personal
Flight phase: Takeoff / Launch
Airspace: Class D ZZZ
ATC / advisory: Tower ZZZ
Aircraft component: Indicating and Warning - Hydraulics
Component problem: Malfunctioning
Reporter organization: Fractional
Reporter function: Pilot Not Flying; Captain
Reporter qualification: Flight Crew Air Transport Pilot (ATP)
Second reporter function: Pilot Flying; First Officer
Anomaly: Aircraft Equipment Problem Less Severe
Detector: Person Flight Crew
When detected: In-flight
Result: Flight Crew Landed in Emergency Condition; Flight Crew Landed As Precaution

Narrative: After takeoff at ZZZ1; Amber Right hydraulic Pump Press low lite came on followed by the Amber Right hydraulic Level low lite followed by Auxiliary hydraulic Pump on lite. Checking the Right hydraulic quantity level it was showing 25% (normal is above 90%) Right hydraulic pressure was fluctuating between 0 and 2;950psi. Diverted to ZZZ2. It was necessary to dump fuel to get to our max landing weight of 30;000 lbs. Landed without incident.


Second narrative: We took off from ZZZ1 at XA:33Z. After we moved Gear Up; we received 'R HYD PUMP PRESS LOW' followed by 'HYD LEVEL LOW' and 'AUX HYD PUMP ON'. (Preflight check which includes stall check was good; Taxi check which includes check of Flight control; nose wheel steering; brakes; Thrust Reversers; Ground/Flight Airbrakes; and Kruger flaps; was good) I as a flying pilot; decided to leave Kruger flaps down since it's from right hydraulic system and we would need later for landing. While we were pulling out a checklist and were handed over to a couple different ATC frequencies; we climbed out to 15;000 feet. Right hydraulic pressure was reading about 2;500psi (normal is 3;000psi) most of times and 0 psi up and down fluctuated. Fluid level was showing 25%.After running some checklists; we decided to divert to ZZZ2 which has 12;000 feet runway. Along the way; captain asked by Flight Attendant to inform passengers that we have a hydraulic issue and [are] diverting to ZZZ2 airport. We had to reduce the landing weight; so we started dumping the fuel. We talked about which system we were losing from right main hydraulic failure. We still had a fluctuated 0-2;500psi pressure; so we decided to move gear down earlier. As soon as we put gear down; hydraulic pressure came back; and fluid level came back to 35%.At this point; we were long base leg of visual Runway [at] ZZZ2. We did a normal landing checklist; and we also discussed about the possibility of losing hydraulic pressure on landing; which would affect brakes and nose gear steering. We stopped Jettison on the final leg as soon as Max Landing weight met.Landing was uneventful; and hydraulic system was working normal except fluid level was showing low 35%. After shutdown of both engines; no trace of leaking fluid was found.


Synopsis: After takeoff a G-200 crew received 'R HYD PUMP PRESS LOW'; 'HYD LEVEL LOW' and 'AUX HYD PUMP ON' warnings. The crew accomplished the appropriate checklists and as a precaution diverted to an airport with a long runway for an uneventful landing.