C750 captain reported pressurization failure causing a return to departure airport.

Attributes
ACN	1670931
Time
Date	201908
Local Time Of Day	1201-1800
Place
Locale Reference	PBI.Airport
State Reference	FL
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Make Model Name	Citation X (C750)
Operating Under FAR Part	Part 91
Flight Phase	Initial Climb
Flight Plan	IFR
Component
Aircraft Component	Pressurization System
Person 1
Function	Pilot Not Flying Captain
Qualification	Flight Crew Air Transport Pilot (ATP) Flight Crew Instrument Flight Crew Multiengine
Events
Anomaly	Aircraft Equipment Problem Critical Deviation - Procedural Clearance

Narrative:

After departure pbi; SLIDZ1 runway 10L; part 91 trip; aircraft not pressurizing. We leveled off at 7000 feet to work the problem and decided to return as cabin would not pressurize. While holding at SLIDZ1; west of pbi to burn fuel for landing weight; we already had slats/flaps 5; speed brakes deployed and gear down to create max fuel burn. Amber cas (crew alerting system) message 'hydraulic volume a low' appeared. We had 6-11% volume in the a system. We ran the checklist; notified ATC we are now [requesting priority handling]; notified dispatch; briefed each other; briefed passengers and landed runway using emergency braking. Came to complete stop on runway. Crash fire rescue equipment (crash fire rescue equipment) and [FBO] tug met us; placed chalks and tugged us off runway without incident.

Original NASA ASRS Text

Title: C750 Captain reported pressurization failure causing a return to departure airport.

Narrative: After departure PBI; SLIDZ1 Runway 10L; part 91 trip; aircraft not pressurizing. We leveled off at 7000 feet to work the problem and decided to return as cabin would not pressurize. While holding at SLIDZ1; west of PBI to burn fuel for landing weight; we already had slats/flaps 5; speed brakes deployed and gear down to create max fuel burn. Amber CAS (Crew Alerting System) message 'HYD VOLUME A LOW' appeared. We had 6-11% volume in the A system. We ran the checklist; notified ATC we are now [requesting priority handling]; notified Dispatch; briefed each other; briefed passengers and landed Runway using emergency braking. Came to complete stop on Runway. CFR (Crash fire rescue equipment) and [FBO] tug met us; placed chalks and tugged us off runway 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.