-equal hydraulic forces occur at both ends of the valve spool
 -the springs continue to move the valve spool in the direction of the neutral position
 -
a restriction of the fluid flow to the motor occurs

 -
a reduction in the motor speed causes a reduction in the rate of flap travel.

 (f) When the flaps get to the commanded position:
 -
the FPPU sends a signal to the SFCC 1 when the flaps are 0.177 deg. (FPPU) away from the commanded position

 -
the SFCC 1 de-energizes the extend (retract) solenoid valve and the POB solenoid valve

 -
the POB comes on

 -when the LVDT shows that the valve spool is 1.5 mm from the neutral position, the SFCC 1 de-energizes the retract (extend) solenoid valve (all three valves are now de-energized)
 -
the fluid flow to the motor stops

 -
the motor stops

 -
the valve spool gets to and stays at the neutral position.

 (g) The flaps stay locked by the POB until the next movement is commanded.

R **ON A/C 001-049, 051-099, 101-149, 151-199, 201-299, 401-499,
 B. Power Transmission
 The PCU differential gearbox moves the flap transmission system in each wing. The operation of the transmission system is the same for each wing. Only one wing system is specified.
 (1)
 Flap Extension

 (a)
 The differential gearbox turns the torque shafts, which move the four actuators at the same time, and at the same speed.

 (b)
 Attached to the actuator output shafts are the drive levers. They turn rearwards through an arc of 112 degrees to move the flap link arms.

 (c)
 The flap link arms move the flaps, on their carriages, along the tracks. At the same time, the flap link arms turn the flaps around the lateral pivot axis.

 (d)
 As the flaps extend, the hinged section of the track fairing lowers. This is caused by the effect of the arm which operates the fairing.

 (2)
 Flap Retraction

 (a) The torque shaft movement to retract the flaps is the opposite of the movement to extend the flaps.
 **ON A/C 301-399,
 B. Power Transmission
 The PCU differential gearbox moves the flap transmission system in each wing. The operation of the transmission system is the same for each wing. Only one wing system is specified.
 (1) Flap Extension
 (a)
 The differential gearbox turns the torque shafts, which move the four actuators at the same time, and at the same speed as each other.

 (b)
 Attached to the actuator output shafts are the drive levers. They turn rearwards through an arc of 103 degrees to move the flap link arms.

 (c)
 The flap link arms move the flaps along the tracks on their carriages. Control rods connected between the carriages, hinge 1A and the tabs extend the tabs at the same time. The flap link arms turn the flaps around the lateral pivot axis.

 (d)
 As the flaps extend, the hinged section of the track fairing lowers. This is caused by the effect of the arm which operates the fairing.

 1EFF : ALL 1 27-54-00Page 80 1 1 May 01/05R 1 1 1CES 1

 (2) Flap Retraction
 (a) The torque shaft movement to retract the flaps is the opposite of the movement to extend the flaps.
 **ON A/C ALL
 8. BITE
____
 Not Applicable

 1EFF : ALL 1 27-54-00Page 81 1 1 May 01/05R 1 1 1CES 1

 FLAPS HYDRAULIC ACTUATION AND POWER TRANSMISSION - ADJUSTMENT/TEST
__________________________________________________________________
 TASK 27-54-00-710-001
 Operational Test of the Flap System
 WARNING : PUT THE SAFETY DEVICES AND THE WARNING NOTICES IN POSITION BEFORE YOU
_______ START A TASK ON OR NEAR:
 -
THE FLIGHT CONTROLS

 -
THE FLIGHT CONTROL SURFACES

 -
THE LANDING GEAR AND THE RELATED DOORS

 -COMPONENTS THAT MOVE.
 WARNING : MAKE SURE THAT THE GROUND SAFETY-LOCKS ARE IN POSITION ON THE LANDING
_______ GEAR.
 1. Reason for the Job
__________________
 Self Explanatory
 2. Job Set-up Information
______________________
 A. Fixtures, Tools, Test and Support Equipment
 -------------------------------------------------------------------------------REFERENCE QTY DESIGNATION
 -------------------------------------------------------------------------------
No specific circuit breaker(s) safety clip(s)
 No specific safety barriers
 No specific warning notice(s)
　
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