Lj-36 captain reported hydraulic system failure at gear extension. The flight declared an emergency ...

Narrative:

Complete hydraulic system failure during landing gear extension. After breaking off the approach the emergency gear extension checklist was completed; with successful gear locked down. After determining the landing distance required; we diverted to [another airport]. Fire trucks were requested; vref 150 KTS. At touch down; I applied full brake pedal and both engine reversers were selected to deploy; the right side deployed; the left took 10-15 seconds to lock deployed. Due to the asymmetrical deployment only idle reverse thrust was available. After reversers selected I reached for the emergency brake handle to engage wheel brakes. The handle would not come out of the detent. After a few seconds of trying the pilot not flying took over trying to engage it to no avail.at this time I turned on the electric hydraulic pump. With no noticeable deceleration it was quickly determined we would be departing the end of the runway at a substantial rate of speed. With no options left aircraft system wise; I decided to weave the aircraft in an attempt to create side load friction with the runway. As we approached the end of the runway our speed was still quite fast but it appeared we might be able to make the last taxi way turn off. With pedal brakes still to the floor; we took the exit and during the turn the brakes lightly engaged. The aircraft came to a stop about 75 ft from runway center line at a 45 degree angle from the runway direction.

Original NASA ASRS Text

Title: LJ-36 Captain reported hydraulic system failure at gear extension. The flight declared an emergency and diverted to a suitable airport. Captain reported considerable difficulty stopping the aircraft but no damage was done.

Narrative: Complete hydraulic system failure during landing gear extension. After breaking off the approach the emergency gear extension checklist was completed; with successful gear locked down. After determining the landing distance required; we diverted to [another airport]. Fire trucks were requested; VREF 150 KTS. At touch down; I applied full brake pedal and both engine reversers were selected to deploy; the right side deployed; the left took 10-15 seconds to lock deployed. Due to the asymmetrical deployment only idle reverse thrust was available. After reversers selected I reached for the emergency brake handle to engage wheel brakes. The handle would NOT come out of the detent. After a few seconds of trying the pilot not flying took over trying to engage it to no avail.At this time I turned on the electric hydraulic pump. With no noticeable deceleration it was quickly determined we would be departing the end of the runway at a substantial rate of speed. With no options left aircraft system wise; I decided to weave the aircraft in an attempt to create side load friction with the runway. As we approached the end of the runway our speed was still quite fast but it appeared we might be able to make the last taxi way turn off. With pedal brakes still to the floor; we took the exit and during the turn the brakes lightly engaged. The aircraft came to a stop about 75 FT from runway center line at a 45 degree angle from the runway direction.

Data retrieved from NASA's ASRS site as of July 2013 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.

Attributes
ACN	1023030
Time
Date	201207
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	Learjet 36
Operating Under FAR Part	Part 135
Flight Phase	Landing
Route In Use	Visual Approach
Flight Plan	IFR
Component
Aircraft Component	Hydraulic Main System
Person 1
Function	Captain Pilot Flying
Qualification	Flight Crew Multiengine Flight Crew Air Transport Pilot (ATP)
Experience	Flight Crew Last 90 Days 150 Flight Crew Total 3500 Flight Crew Type 600
Events
Anomaly	Aircraft Equipment Problem Critical

Lj-36 captain reported hydraulic system failure at gear extension. The flight declared an emergency and diverted to a suitable airport. Captain reported considerable difficulty stopping the aircraft but no damage was done.