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庞巴迪环球5000公务机机组操作手册 Bombardier Global-飞行操纵(11)

时间:2011-11-10 10:26来源:蓝天飞行翻译 作者:公务机
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Rev 2A, Apr 11, 2005 Flight Crew Operating Manual Volume 2

 

FLIGHT CONTROLS
STABILIZER TRIM (CONT'D)
Pitch Trim Schematic

Volume 2 Flight Crew Operating Manual Rev 2A, Apr 11, 2005
STABILIZER TRIM (CONT'D)
Stabilizer Trim Control Switches
The STAB trim control switches are located on the flight control trim panel (centre pedestal). For normal operations, both switches are normally released (not pushed in) and remain dark. A white “OFF”legend is displayed only when the switch is selected. This action will disconnect the channel from the trim system and will remain disconnected as long as the switch has been selected.
STAB Switches
Used to disconnect each channel
of the trim system or reset certain STAB
latched transient faults. CH1 CH2
Selecting the switch will disengage
the pitch trim channel and the

"OFF" light will illuminate.

OFF OFF PUSH OFF/RESET
GF1010_023
Failure monitoring within the FCU provides automatic failure detection and transfer to the opposite channel, along with disabling of the channel detected as failed.
Manual Pitch Trim
The horizontal stabilizer trim is commanded through trim switches located on the pilot and copilot control columns. The switches command airplane nose up or nose down movement of the actuator with a controlled trim rate dependent on the airplane Mach number.
Stabilizer Trim Lever Switches
Enables pilot to vary stabilizer trim
according to flight requirement.
Both levers must be pushed fully
up or fully down to activate the
pitch trim.

Master Disconnect Switch
Provides a disconnect command to
the AFCS and disconnects the

pitch trim function and stall pusher while the switch is held.
NOTE
The pilot control column is shown: copilot’s is similar.
GF1010_024
Rev 2A, Apr 11, 2005 Flight Crew Operating Manual Volume 2
STABILIZER TRIM (CONT'D)
Manual Pitch Trim (Cont’d)
The manual trim rate is 0.5 degree per second at low Mach number and decreases gradually to
0.25 degree per second as the Mach number increases above 0.5M.

Mach Trim
The Mach trim system provides longitudinal stability using Mach speed information from the ADCs and varies the angle of incidence of the horizontal stabilizer by commanding the horizontal stabilizer actuator. Mach trim provides automatic compensation of airplane pitching with changes of Mach number. The trim rate follows a schedule dependent on Mach number. The Mach number is transmitted to the FCUs from the airplane ADCs which pass command signals to the MDU.
The Mach trim authority ranges from 0.5° nose up at 0.85 Mach to 1.8° nose up @ 0.9 Mach. The trim rate varies between 0.03 and 0.06 degree per second as Mach increases.
Mach trim is disabled when the Automatic Flight Control System(AFCS) is engaged.
 
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