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庞巴迪挑战者605公务机机组操作手册 CL605-起落架 LANDING GEAR(3)

时间:2011-10-31 11:40来源:蓝天飞行翻译 作者:公务机
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Nose Doors
With the NLG up and locked, the nose gear compartment is fully enclosed by nose doors. When the gear is up, the aft nose door, mechanically attached to the landing gear assembly, provides partial enclosure of the gear. Left and right forward nose doors are electrically controlled by the PSEU, and hydraulically actuated by hydraulic system 3.


 LANDING GEAR/BRAKES Description  Vol. 2  15.10.4 
Oct 05/06 

When the landing gear is selected down, the forward doors open to allow passage of the gear assembly. When the gear is down and locked, the forward doors close to minimize drag.
When the landing gear is selected up, the forward doors open to allow passage of the gear assembly, and then close after the gear is mechanically locked in the up position.
The nose landing gear forward doors’ actuation, sequencing, and position sensing are controlled and continuously monitored by the PSEU. Any nose door faults or detection of a door position deviation is annunciated by the NOSE DOOR OPEN warning EICAS message and “NOSE DOOR” aural warning.
A maintenance access switch is installed on the external service panel to open and close the nose doors for ground servicing, if hydraulic system 3 pressure is available.

PRIOR TO ACTIVATING HYDRAULIC SYSTEM 3, ENSURE THAT THE NOSE GEAR COMPARTMENT IS CLEAR OF PERSONNEL AND/OR SERVICING EQUIPMENT.
NLG WOW Sensors
Two WOW proximity sensors are incorporated in the nose gear assembly. They prevent landing gear retraction when the aircraft is on the ground, and they provide “ground” or “air” status for other aircraft systems via the PSEU.


 LANDING GEAR/BRAKES Description  Vol. 2  15.10.5 
Oct 05/06 


Nose Gear
Figure 15.10.3


Operation
Normal retraction or extension of the landing gear is initiated by selecting the LDG GEAR lever UP or DN. The retraction or extension signal is sent to the PSEU, which monitors landing gear proximity sensor and weight-on-wheel (WOW) inputs. If the correct proximity sensor and WOW parameters are met, the PSEU sequentially energizes the appropriate selector valves to retract or extend the landing gear, using hydraulic system 3 pressure.


 LANDING GEAR/BRAKES Description  Vol. 2  15.10.6 
Oct 05/06 


Gear Retraction
During gear retraction, the nose landing gear (NLG) retracts forward against the airflow, and the main landing gear (MLG) retract inward. Maximum retraction speed is 197 KIAS (0.6 M).
During landing gear retraction (aircraft in “air” mode/no WOW signal), the PSEU commands and monitors the following events:
.  
Landing gear lever solenoid lock is released, to allow the LDG GEAR lever to be selected up.

.  
NLG door selector valve is energized, to open the forward nose landing gear doors.
 
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