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ELEVATOR AND TAB CONTROL SYSTEM - ELEVATOR FEEL COMPUTER
27-31-00
Page 36
D633A101-GUN Oct 10/2005
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
General
The elevator feel computer receives pitot pressure, hydraulic
pressure, and mechanical inputs. The elevator feel computer
sends metered hydraulic pressure output to the dual feel
actuator on the elevator feel and centering unit.
Physical Description
The elevator feel computer has these components:
* Stabilizer actuated cam (2)
* Q diaphragm (2)
* Droop spring (2)
* Relief valve (2)
* Force balance valve (2)
* Differential pressure switch.
The elevator feel computer has these ports:
* Pneumatic pitot port (2)
* Pneumatic static port (2)
* Hydraulic pressure port (2)
* Hydraulic return port (2)
* Hydraulic computed pressure port (2).
Functional Description
Feel hydraulic pressure in the elevator feel computer varies
between 180 psi (base feel) and 1400 psi (maximum). The actual
feel pressure to the dual feel actuator is determined by the
hydraulic pressure from system A and system B, pitot pressure,
and stabilizer mechanical inputs.
Hydraulic pressure from the system A and B flight control
modules go to the hydraulic pressure ports.
As the airspeed increases, pitot pressure goes through the pitot
port and pushes on the Q diaphragm. The Q diaphragm pushes
and moves the relief valve. This movement is in proportion to
the airspeed. When the relief valve moves, it pushes the force
balance valve. The force balance valve controls hydraulic
pressure that goes to the dual feel actuator. As the airspeed
increases, the feel force increases.
The stabilizer actuated cam position affects the range that the Q
diaphragm can move due to the pitot pressure. As the stabilizer
moves from 0 to 17 units of trim, the cam turns. This limits the
increase in feel force from increased airspeed. If the stabilizer
input to the elevator feel computer disconnects, the spring
moves the cam to the maximum feel pressure position.
ELEVATOR AND TAB CONTROL SYSTEM - ELEVATOR FEEL COMPUTER - FUNCTIONAL DESCRIPTION
EFFECTIVITY
GUN ALL 27-31-00
Page 37
D633A101-GUN Oct 10/2005
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
27-31-00-011
GUN 001-099, 101-113, 115, 201-999
The elevator feel shift module (EFSM) operates during a stall
and provides 850 psi system A pressure to the elevator feel
computer and dual feel actuator. See the stall warning system
section for more information about the elevator feel shift
module operation. (SECTION 27-32)
GUN ALL
Monitor
The feel differential pressure switch monitors both elevator feel
computer metered pressures. The switch closes when there is a
difference of 25 percent between system A and system B
metered pressure.
GUN 114
The FEEL DIFF PRESS light on the P5 panel comes on when the
differential pressure switch is closed and the trailing edge flaps
are up.
GUN 001-099, 101-113, 115, 201-999
The FEEL DIFF PRESS light on the P5 panel comes on when the
differential pressure switch is closed for more than 30 seconds.
GUN ALL
ELEVATOR AND TAB CONTROL SYSTEM - ELEVATOR FEEL COMPUTER - FUNCTIONAL DESCRIPTION
EFFECTIVITY
GUN ALL 27-31-00
Page 38
D633A101-GUN Jun 10/2006
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
27-31-00-011
ELEVATOR AND TAB CONTROL SYSTEM - ELEVATOR FEEL COMPUTER - FUNCTIONAL DESCRIPTION
ELEVATOR AND TAB CONTROL SYSTEM - ELEVATOR FEEL COMPUTER - FUNCTIONAL DESCRIPTION
EFFECTIVITY
GUN 114 27-31-00
Page 39
D633A101-GUN Jun 10/2006
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
27-31-00-011
ELEVATOR AND TAB CONTROL SYSTEM - ELEVATOR FEEL COMPUTER - FUNCTIONAL DESCRIPTION
ELEVATOR AND TAB CONTROL SYSTEM - ELEVATOR FEEL COMPUTER - FUNCTIONAL DESCRIPTION
EFFECTIVITY
GUN 001-099, 101-113, 115, 201-999 27-31-00
Page 40
D633A101-GUN Jun 10/2006
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
27-31-00-011
Purpose
The elevator feel and centering unit gives variable feel force to
the pilot. It also moves the control column to a neutral position
　
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