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GROUND LOCKING PIN
DOWNLOCK ASSIST SPRING
CFO1501002_005
Volume 2 Flight Crew Operating Manual Sep 13/2004 CSP 100-6 REV 1
15-01-08 LANDING GEAR (CONT)
NORMAL EXTENSION AND RETRACTION
Normal retraction and extension of the landing gear is initiated by selecting the landing gear switch UP or DN. The retrac-tion or extension signal is sent to the PSS which monitors various landing gear proximity sensors and weight on wheels (WOW) inputs. If the correct parameters are met, the proximity system electronic unit (PSEU) energizes the selector valve to retract or extend the landing gear using the left hydraulic system.
GEAR EXTENSION
During gear extension, the NLG extends rearward and the MLG extends outward.
When the landing gear switch is manually selected to the DN position, the PSEU commands and monitors the following events:
-Landing gear selector valve is energized to direct hydraulic fluid to release the MLG uplocks and the nose over-center mechanism, extending the landing gear -NLG and MLG downlocks are hydraulically and mechanically engaged to secure the landing gear in the extended position.
GEAR RETRACTION
During retraction, the nose gear retracts forward and the main gear retracts inward.
During landing gear retraction (no WOW signal), the PSEU commands and monitors the following events:
-Landing gear selector valve is energized to direct hydraulic fluid to release the respective downlocks and retract the NLG and MLG. The brake control unit (BCU) commands a brake pressure of 350 psi for four seconds during gear retraction to ensure the main wheels have stopped spinning as they enter the MLG bay.
-When the gear is fully up, uplocks for the MLG are engaged mechanically. The uplock mechanism consists of a housing bolted to the airframe structure containing a latch lever and hook that engages a roller attached to the steering cuff of the landing gear. The hook holds the NLG in the retracted position.
-A restrictor is located in the aft of the NLG wheel well. This restrictor is installed in the up hydraulic line. When the landing gear selector handle is selected UP, this restrictor will decrease hydraulic fluid flow which decreases the retraction speed and allows the NLG to retract smoothly and with less noise.
Sep 13/2004 Flight Crew Operating Manual Volume 2 REV 1 CSP 100-6
15-01-09 LANDING GEAR (Cont)
MANUAL RELEASE SYSTEM (MRS)
Should a failure occur with the landing gear control circuitry or the left hydraulic system, the manual release system is available to the crew as an alternate means to extend the landing gear. Upon release from the uplock, the nose landing gear will fully extend with the aid of gravity and spring forces, while the auxiliary extend actuators assist in the extension of the main landing gear.
The handle is located near the rear of the center pedestal on the copilot’s side. When the manual release handle is operated by the aircrew, cable movement is transmitted through the main quadrant, by a closed loop cable assembly to the main land-ing gear quadrant, and MLG valve assemblies. The displacement of the spools on the two dump valves blocks the supply of hydraulic pressure and connects the downstream landing gear components via the return lines to the left hydraulic system reservoir and bypasses the landing gear actuators. The MLG quadrant operates the MLG uplock manual release levers via tension cables. Displacement of the uplocks releases the MLGs for gravity extension.
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本文链接地址：庞巴迪挑战者300公务机机组操作手册 Bombardier Challenger-起落架(7)
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