Cl-300 flight crew reported loss of fluid for the number 2 hydraulic system; causing a diversion pri...

Attributes
ACN	1741733
Time
Date	202005
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Make Model Name	Challenger 300
Operating Under FAR Part	Part 135
Flight Phase	Cruise
Flight Plan	IFR
Component
Aircraft Component	Indicating and Warning - Hydraulics
Person 1
Function	Captain Pilot Flying
Qualification	Flight Crew Instrument Flight Crew Multiengine Flight Crew Air Transport Pilot (ATP)
Person 2
Function	First Officer Pilot Not Flying
Qualification	Flight Crew Multiengine Flight Crew Air Transport Pilot (ATP) Flight Crew Instrument
Events
Anomaly	Aircraft Equipment Problem Critical Deviation - Procedural Published Material / Policy

Narrative:

During cruise and about one hour from our destination we noticed the right hydraulic reservoir quantity indication turned white; the value indicated it was on the low side but pressure remained normal. Then; we noticed it was decreasing in 2 percent increments approximately every 5 minutes with a normal pressure (3;000psi) throughout the remaining of the flight. We advised the company; the client and ATC. We looked in the fcom vol. 2 for some guidance and decided to get ourselves familiarize with the hydraulic press low procedure listed in the QRH just in case. After assesing the situation and expecting a hyd press low cas message to come next; we decided and coordinated with the company to divert to ZZZ. We briefed the approach into ZZZ and concluded to configure the aircraft early in case we had to run any checklist. We declared an emergency upon checking in with ZZZ approach. During the configuration of the airplane; the reservoir quantity indication continued to decreased but the pressure remained normal. After fully configured the quantity was reading four percent. We landed on runway xxr and taxiied to the FBO without incident.

Original NASA ASRS Text

Title: CL-300 flight crew reported loss of fluid for the number 2 hydraulic system; causing a diversion priority landing.

Narrative: During cruise and about one hour from our destination we noticed the right hydraulic reservoir quantity indication turned white; the value indicated it was on the low side but pressure remained normal. Then; we noticed it was decreasing in 2 percent increments approximately every 5 minutes with a normal pressure (3;000psi) throughout the remaining of the flight. We advised the company; the client and ATC. We looked in the FCOM Vol. 2 for some guidance and decided to get ourselves familiarize with the HYD PRESS LOW procedure listed in the QRH just in case. After assesing the situation and expecting a Hyd Press Low CAS message to come next; we decided and coordinated with the company to divert to ZZZ. We briefed the approach into ZZZ and concluded to configure the aircraft early in case we had to run any checklist. We declared an emergency upon checking in with ZZZ approach. During the configuration of the airplane; the reservoir quantity indication continued to decreased but the pressure remained normal. After fully configured the quantity was reading four percent. We landed on Runway xxR and taxiied to the FBO without incident.

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.

Cl-300 flight crew reported loss of fluid for the number 2 hydraulic system; causing a diversion priority landing.