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庞巴迪挑战者605公务机机组操作手册 CL605-飞行操纵 FLIGHT_CONTROLS(5)

时间:2011-10-28 11:47来源:蓝天飞行翻译 作者:公务机
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 FLIGHT CONTROLS Description  Vol. 2  10.10.8 
Oct 05/06 

Components and Operation

Horizontal Stabilizer Trim
Pitch trim is accomplished by varying the angle of incidence of the horizontal stabilizer. The horizontal stabilizer trim control unit (HSTCU) commands the actuation of the stabilizer leading edge with a jackscrew, driven by two electric motors through a range of 0° to .9° at specific rates of movement. The HSTCU receives inputs from the pilot’s and copilot’s control wheel pitch trim switches, the autopilot, and the Mach trim system. The HSTCU has two channels that are engaged by the CH 1 and CH 2 switch/lights on the STAB TRIM panel on the center pedestal. Normally, with both channels engaged, CH 1 is in command, with CH 2 in standby.
Operation of the horizontal stabilizer is continuously monitored by the HSTCU. In the event of a single-channel failure, the STAB CH 1 (2) INOP status EICAS message will appear, and the remaining channel will provide control. If both channels fail, the STAB TRIM caution EICAS message appears, and stabilizer trim becomes inoperative.
Horizontal stabilizer trim position is displayed on the EICAS page and the FLIGHT CONTROLS synoptic page. The normal trim setting for takeoff (3 to 8 units) is depicted on the indicator as a green band.
If stabilizer trim is not set in this range with the aircraft in the take-off mode, a CONFIG STAB warning EICAS message will be displayed, and an aural “CONFIG TRIM” will sound.

Horizontal Stabilizer Trim Priority
The stabilizer trim can be operated manually with the pilot’s and copilot’s control wheel pitch trim switches, or automatically with the autopilot or the Mach trim system. The order of priority and rate of movement are as follows:
1.  
Pilot manual trim – The pilot’s control wheel pitch trim switch is highest in the order of priority. The stabilizer rate of movement is 0.5°/sec.

2.  
Copilot manual trim – The copilot’s control wheel pitch trim switch is next highest in the order of priority. The stabilizer rate of movement is 0.5°/sec.

3.  
Autopilot trim – The stabilizer rate of movement is 0.1°/sec. If a flap selection is made with the autopilot engaged, the rate of movement reverts to the higher rate of 0.5°/sec during flap transition.

4.  
Mach trim – The Mach trim is lowest in the order of priority. The stabilizer rate of movement is between 0.03° and 0.06°/sec.

 

Horizontal Stabilizer Trim Clacker
If the horizontal stabilizer is in motion at a rate of more than 0.3°/sec for more than 3 seconds, a clacker (“drumroll” sound) is activated, to alert the pilot of a possible horizontal stabilizer trim runaway condition.
In the event of a runaway stabilizer trim condition, both channels can be quickly disconnected, by pressing the STAB TRIM DISC button on either outboard control wheel horn.
 
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