Air taxi captain reported main hydraulic system a had a decreasing system quantity; causing a divers...

Attributes
ACN	1742204
Time
Date	202005
Local Time Of Day	1201-1800
Place
Locale Reference	ZZZ.Airport
State Reference	US
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Make Model Name	Citation X (C750)
Operating Under FAR Part	Part 135
Flight Phase	Cruise
Route In Use	Direct
Flight Plan	IFR
Component
Aircraft Component	Hydraulic Main System
Person 1
Function	Captain
Qualification	Flight Crew Air Transport Pilot (ATP) Flight Crew Instrument Flight Crew Multiengine
Experience	Flight Crew Last 90 Days 100 Flight Crew Total 3450 Flight Crew Type 1050
Events
Anomaly	Aircraft Equipment Problem Critical Deviation - Procedural Clearance Deviation - Procedural Published Material / Policy

Narrative:

In cruise; we got a hydraulic a volume low message; it was down to 15%. We monitored and continued per the checklist. We discussed the possibility of losing more fluid on the landing gear deployment and continued flight. We were scheduled to land at ZZZ (7000 ft. Runway); but both agreed that if the volume dropped below 10% we would divert to ZZZ1 in order to use the 11;000 ft. Plus runway. This was just in case we were to lose all the remaining fluid volume upon thrust reverser deployment and use of brakes; which would force us to use our emergency/air brakes; significantly increasing our stopping distance. When we deployed the gear the volume dropped to 8% so per our plan diverted to ZZZ1 where we landed without incident.

Original NASA ASRS Text

Title: Air Taxi Captain reported main hydraulic system A had a decreasing system quantity; causing a diversion.

Narrative: In cruise; we got a HYD A Volume Low message; it was down to 15%. We monitored and continued per the checklist. We discussed the possibility of losing more fluid on the landing gear deployment and continued flight. We were scheduled to land at ZZZ (7000 ft. runway); but both agreed that if the volume dropped below 10% we would divert to ZZZ1 in order to use the 11;000 ft. plus runway. This was just in case we were to lose all the remaining fluid volume upon thrust reverser deployment and use of brakes; which would force us to use our emergency/air brakes; significantly increasing our stopping distance. When we deployed the gear the volume dropped to 8% so per our plan diverted to ZZZ1 where we landed 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.

Air taxi captain reported main hydraulic system a had a decreasing system quantity; causing a diversion.