Learjet 45 flight crew reported a MAIN HYD QTY LO Message; followed by a AUX HYD QTY LO Message in cruise. The flight crew requested priority handling and diverted to make a precautionary landing.
Synopsis
Learjet 45 flight crew reported a MAIN HYD QTY LO Message; followed by a AUX HYD QTY LO Message in cruise. The flight crew requested priority handling and diverted to make a precautionary landing.
Narrative
Upon leveling off at FL380 en route from ZZZZ to ZZZ; the EICAS System alerted the crew to a white 'MAIN HYD QTY LO' message. The crew performed the checklist which required no items to be performed and advised that the Fluid Quantity in the Main Hydraulic Side of the Reservoir was Low. Several moments later; the EICAS System alerted the crew with a Master Caution and Amber Crew Alert System (CAS) Message 'AUX HYD QTY LO' Message; in which the crew immediately performed the actions specified in the QRH. While running the QRH for the 'AUX HYD QTY LOW'; pressure in the Main Hydraulic System began to drop rapidly generating a subsequent Master Caution Alert with associated Amber 'MAIN HYD PRESS' Message. Determining that the aircraft was in a state of complete Hydraulic Failure; the crew [requested priority handling] with ZZZZ Center and advised of intentions to divert to ZZZZ1 to perform an immediate landing on their longest runway (Runway X).Being too heavy too land as the aircraft had just departed ZZZZ and lacks capability to jettison fuel; the crew requested holding instructions in order to burn off fuel and complete all of the appropriate QRH Checklist items prior to attempting the urgent landing. ZZZZ Center issued holding instructions north of the ZZZZZ Intersection at 10000 ft. While in holding; the crew was made aware that Runway X was wet from a passing rain shower; in which the crew elected to remain in holding until confirmation of a dry runway prior to attempting the landing in order to solicit the most successful outcome. Additionally; while in holding; the crew was able to successfully lower the landing gear using the alternate free-fall procedure in the QRH but was unsuccessful in lowering the flaps; requiring the landing to be zero flap. Having completed all checklists the crew briefed the landing procedure that would be performed zero flap; with Inoperative Spoilers; Thrust Reversers and Normal Barking as well as use of the Emergency Braking System. The flight crew additionally briefed the medical crew and passengers of the nature of the situation and what commands and instructions to expect upon landing.After confirmation that Runway X was dry; the crew departed holding and performed the ILS X approach to a successful and safe landing on Runway X. Once the aircraft came to a complete stop; the crew notified ATC that the aircraft would be disabled on the runway and will require a tow to the FBO. Moments later; the Fire Department inspected the aircraft on the runway and observed no damage nor any blown tires and that the aircraft was safe to tow off the runway. During this time; the crew determined that there was no need for evacuation and elected to keep everyone onboard the aircraft until it was safely towed to the FBO. Once parked at the FBO; both crew members performed a post flight inspection of the aircraft and determined there was no damage. Additionally; no injuries were incurred during the course of the event. The Dispatch Team; Director of Maintenance and Director of Operations were all immediately notified of the Urgent Landing and debriefed. Finally; the appropriate write up was entered into the aircraft's maintenance log and submitted for review and correction by the Maintenance Team.
Second reporter narrative
After departure from ZZZZ and leveling off at 38000 ft; a White MAIN HYD QTY LO Message appeared on the EICAS. I then looked up the QRH and ran the checklist which required no items to be done; and only advised that the Main Quantity was Low. Two to three minutes later we got a Master Caution and an Amber Crew Alert System (CAS) Message AUX HYD QTY LO. I then used the QRH checklist and performed the actions specified. While running the QRH checklist for the AUX HYD QTY LOW; the Left Main Hydraulic System began to steadily lose pressure giving a Master Caution Alert and Amber MAIN HYD PRESS Message. We verified that we were having a Hydraulic System Failure with both the Main and Aux system. We [requested priority handling] with ZZZZ Center; and advised them we wanted to make an urgent landing at ZZZZ1 using Runway X. We requested holding instructions in order to burn off fuel and to complete all of the QRH Checklist items prior to attempting the urgent landing. ZZZZ Center issued holding instructions at ZZZZZ intersection at 10000 ft. While in holding; ZZZZ notified that Runway X was currently wet from a rain shower. We discussed our options and decided to remain in holding until confirmation of a dry runway prior to attempting to land in order to have the best landing conditions. This also allowed more fuel to be burned which allowed us to have a slower approach speed; and the ability to stop quicker. Using the QRH check list we lowered the gear by the free fall method; but was unsuccessful in lowering the flaps; requiring the landing to be zero flap landing. Having completed all checklists; we briefed the landing procedure that we would be performing; a zero Flap; no Spoilers; no thrust reversers; and would use the emergency braking system. The Medical Crew and passengers were briefed on the situation and urgent landing.After confirmation that Runway X was dry; we departed the hold and asked for vectors for the ILS X approach. A safe landing was performed on Runway X. Once the aircraft came to a complete stop; we notified ATC that the aircraft was disabled on the runway and will require a tow to the FBO. The Fire Department inspected the aircraft on the runway and observed no damage; no blown tires; and that the aircraft was safe to tow off the runway. We determined that there was no need for evacuation on the runway; and decided to keep everyone onboard. Once parked at the FBO; we got the patient off the aircraft safely and as quickly as possible. During the post flight inspection there was no damage to the aircraft; and there were signs of a Hydraulic Leak which confirmed a malfunction of the Hydraulic System. There were no injuries during the course of the event. The PIC contacted all required persons and debriefed them on the situation.
Source: NASA Aviation Safety Reporting System (public domain). Reports are voluntary submissions and are not verified by NASA.