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NLG and MLG selector valves are energized, to direct hydraulic fluid to release the respective downlocks, and retract the NLG and MLG. Hydraulic pressure from the nose gear up line is directed to the brake control valves, to stop main wheel rotation (in-flight braking).
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When the gear is fully retracted, uplocks for the NLG and MLG are mechanically engaged to secure the landing gear in the retracted position.
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NLG door selector valve is energized to close the forward NLG doors.
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On completion of the retract sequence, NLG, NLG door and MLG selector valves are de-energized, and hydraulic pressure is removed. The NLG, NLG door and MLG are held by their respective close/uplock mechanisms.
Downlock Release
The LDG GEAR lever is equipped with a solenoid lock, which prevents UP selection of the LDG GEAR lever with the airplane on the ground. After takeoff, if the solenoid lock or a PSEU malfunction occurs, a downlock release button (DN LCK REL) on the LDG GEAR control panel can be used. Pressing the DN LCK REL button mechanically withdraws the solenoid lock, permitting UP selection of the LDG GEAR lever.
Gear Extension
During gear extension, the NLG extends rearward and the MLG extend outward. Maximum extension speed is 197 KIAS (0.6 M).
When the LDG GEAR lever is selected to the DN position, the PSEU commands and monitors the following events:
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NLG door selector valve is energized, to open the forward NLG doors.
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NLG and MLG selector valves are energized, to direct hydraulic fluid to release the respective uplocks and extend the landing gear.
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NLG and MLG downlocks are mechanically engaged, to secure the landing gear in the extended position.
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NLG door selector valve is energized, to close the forward NLG doors.
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The hydraulic selector valves remain energized, to provide full-time hydraulic pressure on the NLG and MLG actuators, and to hold the NLG door closed.
NOTE
The maximum airspeed at which the airplane may be flown with the landing gear extended and locked is 250 KIAS (0.7 M).
LANDING GEAR/BRAKES Description Vol. 2 15.10.7
Oct 05/06
NOTE
If the landing gear position does not match the LDG GEAR lever position within 28 seconds, the amber gear-in-transition indication is replaced by the red gear-not-safe indication, accompanied by the GEAR DISAGREE warning EICAS message and aural warning.
Normal Gear Extension
Figure 15.10.4
LANDING GEAR/BRAKES Description Vol. 2 15.10.8
Oct 05/06
Alternate Landing Gear Extension
Should a failure occur with the landing gear control circuitry or hydraulic system 3, landing gear extension is still possible, by pulling the red LANDING GEAR MANUAL RELEASE handle.
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本文链接地址：庞巴迪挑战者605公务机机组操作手册 CL605-起落架 LANDING GEAR(4)
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