Date: 201909
Local time of day: 0601-1200
Location: ZZZ.Airport, US
Flight conditions: Marginal
Light: Daylight
Aircraft: Citationjet (C525/C526) - CJ I / II / III / IV
Operator: Corporate
Operating under: Part 91
Flight plan: IFR
Flight phase: Landing
Airspace: Class D ZZZ
ATC / advisory: Tower ZZZ
Aircraft component: Landing Gear
Component problem: Failed
Reporter organization: Corporate
Reporter function: Captain; Pilot Flying
Reporter qualification: Flight Crew Instrument; Flight Crew Multiengine; Flight Crew Air Transport Pilot (ATP)
Human factors: Situational Awareness
Second reporter function: Pilot Not Flying; First Officer
Anomaly: Aircraft Equipment Problem Critical; Deviation / Discrepancy - Procedural Published Material / Policy
Detector: Person Flight Crew
When detected: In-flight
Result: Flight Crew Landed in Emergency Condition; Flight Crew Executed Go Around / Missed Approach; General Maintenance Action
Contributing factors: Aircraft
Primary problem: Aircraft

Narrative: We were on approach to ZZZ. Just outside the final approach fix we selected the gear down and we got no response from the gear system or the power brake system. We broke the approach off and asked for vectors to run a checklist. We ran the emergency gear extension checklist and got a 3 green and no red indication. After that we also had a low brake press light on so we ran that checklist. After all checklists were completed we advised ATC of our situation. They gave us vectors for the RNAV and we landed with no gear issues. We did have to use the emergency brake system after landing; we cleared the runway; advised ATC we were shutting down the engines on the taxiway so we could talk to the emergency responders. The SIC (Second in Command) got out and chocked both main gears while I held the emergency brakes. One of the fire trucks remained with us on the taxiway until the FBO came to tow us to the ramp.


Second narrative: While on approach to ZZZ; just outside of [the FAF] PIC selected and moved the gear handle to the down position. There was no response from the gear system or power brake system; the only annunciator illuminated was the HYD PRESS light. We then broke off the approach and asked for vectors to work the problem and run the checklists. PIC called for the emergency gear checklist which we completed and got a 3 green no red indication. After the emergency gear ext checklist was complete we then noticed that we had a low power brake pressure annunciator that had illuminated. PIC called for that checklist which was completed. After we had completed all checklists and double checked we had not missed anything we then advised ATC. ATC then proceeded to give us vectors for a 10 mile final for RNAV. We then landed with no physical gear issues. The PIC did have to exercise the emergency brake system after landing due to the loss of the power brakes. We cleared the runway advised ATC that we were shutting down the engines on the taxi way in order to talk to first responders. After talking to the first responders I then grabbed our spare set of chocks from the nose and chocked both mains while the PIC held the emergency brakes. One of the fire trucks remained with us on the taxi way until the FBO came and towed us back to the ramp. The passengers were taken to the FBO in one of the first responders SUV.


Synopsis: C525A flight crew reported hydraulic pressure failure resulted emergency gear extension and loss of power brakes.