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The elevator neutral shift rods are pogo type control rods with a
spring inside. When the stabilizer moves, it moves the two
elevator neutral shift rods. The neutral shift rods move a torque
tube and crank assembly which moves the mach trim actuator.
When the mach trim actuator moves because of the neutral shift
rod input, it acts as a link and turns the elevator feel and
centering unit housing. This creates a new neutral position for
the elevators.
Each rod also provides protection, in both directions (push or
pull) if there is jam between the stabilizer and the elevator feel
and centering unit. The pilot must supply approximately 180
pounds of additional force to extend or compress the springs
inside the rods. The breakout force of each rod is 90 pounds.
See the elevator and tab control system section for more
information on the elevator operation. (SECTION 27-31)
HORIZONTAL STABILIZER TRIM CONTROL SYSTEM - FUNCTIONAL DESCRIPTION
EFFECTIVITY
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HORIZONTAL STABILIZER TRIM CONTROL SYSTEM - FUNCTIONAL DESCRIPTION
HORIZONTAL STABILIZER TRIM CONTROL SYSTEM - FUNCTIONAL DESCRIPTION
EFFECTIVITY
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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
Purpose
The trailing edge (TE) flaps increase the wing area and the wing
camber. This increases lift to help improve the takeoff and
landing performance of the airplane.
General
Two double-slotted flaps on each wing extend during takeoff to
increase lift. This permits slower speeds for airplane rotation
during takeoff. During cruise, the TE flaps fully retract. During
landing, the TE flaps fully extend to increase lift and increase
drag to permit slower speeds at touchdown.
During the normal operation of the TE flaps, the TE flaps are
mechanically controlled and hydraulically operated. During the
alternate operation, the TE flaps are electrically controlled and
electrically operated.
The flap load relief function retracts the TE flaps at high
airspeeds to prevent structural damage to the TE flaps and wing
structures.
The TE flap skew and asymmetry detection functions stop the
TE flap hydraulic operation if the TE flaps are not aligned. The
TE flap uncommanded motion (UCM) detection function stops
the TE flap hydraulic operation if the TE flaps move away from
their commanded position.
You can do tests of the TE flaps with built-in test equipment
(BITE) in the flap/slat electronics unit (FSEU). The FSEU BITE
also lets you see other maintenance data.
Abbreviations and Acronyms
* alt - alternate
* BITE - built-in test equipment
* FCC - flight control computer
* FSEU - flap/slat electronics unit
* gnd - ground
* GPM - gallons per minute
* LE - leading edge
* lvr - lever
* MLG - main landing gear
* NWW - nose wheel well
* NVM - non-volatile memory
* PCU - power control unit
* PDU - power drive unit
* PSEU - proximity switch electronics unit
* rly - relay
* sect - section
* SMYD - stall management yaw damper
* snsr - sensor
* sw - switch
* TE - trailing edge
* UCM - uncommanded motion
* vlv - valve
* xmtr - transmitter
* WW - wheel well
TE FLAP SYSTEM - INTRODUCTION
EFFECTIVITY
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TE FLAP SYSTEM - INTRODUCTION
TE FLAP SYSTEM - INTRODUCTION
EFFECTIVITY
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TE FLAP SYSTEM - INTRODUCTION
EFFECTIVITY
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