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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(6)

时间:2011-10-31 11:40来源:蓝天飞行翻译 作者:公务机
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There are two WOW proximity sensors installed on each landing gear assembly, for a total of six WOW sensors. Various aircraft systems require “ground” or “air” mode information for operation. The PSEU determines “ground” mode and “air” mode as follows:
PSEU Mode Determination Table


 LANDING GEAR/BRAKES Description  Vol. 2  15.10.11 
Oct 05/06 

MAIN WHEEL BINS AND OVERHEAT DETECTION Description Each main gear assembly retracts inward into wheel bins that are recessed in the main landing gear bay. Components and Operation Wheel Bins
The wheel bins isolate the wheels from the main landing gear bays, and prevent tire-thrown debris from damaging the equipment located within the MLG bay. The bins can be removed to allow maintenance personnel access to the MLG bay.

Main Landing Gear Overheat Detection
An overheat detection unit and heat-sensing loop continuously monitor each wheel bin for overheat conditions. If an overheat condition exists, the MLG BAY OVHT warning EICAS message will be displayed, and the “GEAR BAY OVERHEAT” aural will sound.
If a failure is detected (shorted heat-sensing loop), the MLG BAY OVHT FAIL caution EICAS message will be displayed. For additional information, see Chapter 9, Fire Protection.

MLB Bay Overheat Test
The MLG bay overheat detection system can be tested at the LDG GEAR control panel. The MLG BAY OVHT TEST switches simulate an overheat or failed condition, and generate EICAS messages as explained above.

MLG BAY OVHT TEST Switches
Figure 15.10.6

NOSE WHEEL STEERING SYSTEM

Description
The nosewheel steering system is hydraulically actuated through a steering actuator mounted on the nose landing gear assembly. There is no mechanical connection between the flight deck controls and the steering actuator. Nosewheel steering commands are transmitted electronically using “steer-by-wire” technology.


 LANDING GEAR/BRAKES Description  Vol. 2  15.10.12 
Oct 05/06 


Components and Operation
The nosewheel steering system is armed by the NOSE STEER switch, located on the LDG GEAR control panel. The system is activated when hydraulic system 3 is pressurized, the nose landing gear is down and locked, and the PSEU “ground” mode is satisfied.
Steering control is initiated via the steering tiller and/or by the rudder pedals. Nosewheel deflection of up to 55 degrees on either side of center is possible when using the steering tiller. Rudder pedal movement will deflect the nosewheel up to 7 degrees either side of center.
With the NOSE STEER switch selected to ARMED, the 55-degree limit may inadvertently be exceeded, if sufficient differential braking is applied in the direction of the turn. When the 55-degree angle is exceeded, the nosewheel steering system is automatically disabled, and the nosewheel casters freely to a maximum of 99 degrees.
 
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