Learjet 35 flight crew reported loss of hydraulic pressure during departure climb. The flight crew performed a diversion and landed successfully using the emergency braking system.
Synopsis
Learjet 35 flight crew reported loss of hydraulic pressure during departure climb. The flight crew performed a diversion and landed successfully using the emergency braking system.
Narrative
After takeoff from ZZZ; I ran the after takeoff checklist. I checked the hydraulic pressure; and it was normal. Upon reaching 10;000 ft.; the crew noticed the 'Low Hyd' light came on and there was no hydraulic pressure. After running three amber 'abnormal' checklists; we knew we would have no hydraulics to run the spoilers; brakes; and gear. After further discussion we [requested priority handling] with Center; jettisoned fuel; and head for the longest runway at ZZZ1. The checklist called for around 6200 ft. of runway distance to land; and knew at ZZZ1 [Runway] XXR had 9000 ft. of pavement. Upon landing; the thrust reversers didn't deploy as stated with the DH4000s. We used emergency braking and came to a stop around the 8400 ft. mark at ZZZ1 on Runway XXR. I tried to inform Tower of the evacuation five times with no answer. We ran the after landing checklist and shutdown checklist on the runway; and chose not to run the emergency evacuation due to no suspected fire or damage to any aircraft parts (minus the landing gear and tires). There ended up being no noticeable damage to the aircraft; minus the hydraulic leak that happened some time after climbing. I requested the fire department chock us until a tug was hooked up to the aircraft. Due to weather delays; we were on the runway for around an hour or so after landing waiting for a tug.
Second reporter narrative
Our Learjet 35A was tasked on a Company mission out of ZZZ to ZZZZ.After Departure from ZZZ; we ran the After Takeoff Checklist. Whilst on vectors to assigned altitude a (Low Hydraulic Light) came on. At that point the Hydraulic Pressure Gauge indicated Zero. The Quick Reference Handbook (QRH) Amber Checklist was followed; indicating that we would need to perform an Alternate Gear Extension; and lost several of the Hydraulic Systems (Flaps; Spoilers; Thrust Reversers (One Shot); and Brakes).We informed ATC that we had an issue; and stopped climb and possible diversion to (ZZZ1). The decision was made to [advise ATC] and reduce our Fuel Load. We received Clearance to Jettison; ran further Checklist and Prepared the Cabin for Landing. The Calculated Landing Distance was around 6;200 ft.; and informed ATC that we required Runway XXR given its 9000 Length Available.Once the Checklists was completed and we Briefed the Approach Chart; ATC vectored us for the ILS XXR into ZZZ1. We informed ATC that we will be disabled on the Runway after Landing and will need a Tug to pull us. The ILS XXR was flown. On Landing the Normal Brakes did not function and Spoilers Failed to Deploy (As Anticipated); Limited or no Reversers. The Emergency Braking system was activated and the aircraft came to a stop in around 8;400 ft. The services approached the aircraft; and helped secure the aircraft. No Emergency Evacuation took place; given no suspected fire or aircraft damage sustained. The After Landing and Shutdown Check was performed. The aircraft was subsequently towed off the Runway. Operations and Chief Pilot was notified and subsequent reports filed.
Source: NASA Aviation Safety Reporting System (public domain). Reports are voluntary submissions and are not verified by NASA.