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 time of normal operation. 
R  **ON A/C 301-399, 
R  The offset gearbox of the track 4 actuator drives an Asymmetry Position 
R  Pick-off Unit (APPU) (Ref. 27-51-00). 
R 
R  Carriages, which roll freely on staight tracks, hold each flap. Track 
R  installation is on beams below the wing. Vertical-load rollers and 
R  side-load rollers keep the carriages on the tracks. Each carriage has a 
R  containment device to hold it on the track if a failure occurs. 
R 
R  The carriages, tracks and beams at tracks 2, 3 and 4 are made almost the 
R  same. Attached to the fuselage is track 1, which uses a different 
R  configuration to that at tracks 2, 3 or 4. Attached to the flap bottom 
R  surface at tracks 2, 3 and 4 are brackets. Connected to the brackets is a 
R  linkage which operates the hinged part of the track fairing during flap 
R  extension and retraction. 
R 
R  At the end of each track are mechanical stops. The stops prevent 
R  retraction overtravel and makes sure that the flap does not disengage at 
R  the end of flap extension. Engagement of the stops does not occur at a 
R  time of normal operation. 
R 
R  Hinge mechanisms connect the trailing edge of the tab surface to the 
R  primary surface of the flap. Five hinge mechanisms hold the outboard flap 
R  tab to the outboard flap and three hinge mechanisms hold the inboard flap 
R  tab to the inboard flap. The tabs and flaps move in relation to each 
R  other during extension and retraction.

 

R **ON A/C ALL
 4. Power Supply
____________
 Not Applicable
 5. Interface
_________
 Not Applicable
 6. Component Description
_____________________
R (Ref. Fig. 007, 008)
 A. Power Control Unit
 (1) Description
 The flap PCU is a hydro-mechanical unit. The main body, which is a case, contains a differential gearbox.
 The Line Replaceable Units (LRUs) of the PCU are as follows:
 -
two hydraulic motors

 -
two Pressure-Off Brakes (POB)

 -
two valve blocks

 

 -six solenoid valves

 -two inlet filters
 - one Feedback Position Pick-off Unit (FPPU)
 - one Instrumentation Position Pick-off Unit (IPPU).

 (a) Hydraulic Motor

R (Ref. Fig. 009)
 Each multi-piston hydraulic motor receives hydraulic pressure from a valve block. The output shaft of the motor is connected to a POB. Hydraulic fluid lubricates the motor. The cylinders of the motor are connected to two ports, referred to as the extend and retract ports. When the valve block supplies hydraulic fluid to the extend port, the motor moves in the direction necessary to extend the flaps. When hydraulic pressure is supplied to the retract port, the motor moves in the opposite direction and the flaps retract.

R  Power Control Unit Figure 007
 1EFF : 1 1 1CES  ALL  1 111 27-54-00 Page 18 May 01/04

 

R  Power Control Unit - Schematic Figure 008
 1EFF : 1 1 1CES  ALL  1 111 27-54-00 Page 19 May 01/04

 

R  Hydraulic Motor Figure 009
 1EFF : 1 1 1CES  ALL  1 111 27-54-00 Page 20 May 01/04

 

 (b) Pressure-Off Brake (POB)
R (Ref. Fig. 010)
 A POB is attached to each hydraulic motor. It holds the output shaft of the hydraulic motor when:
 -
the hydraulic motors do not operate

 -
the related hydraulic system does not supply sufficient hydraulic power

 -
the WTB stops the flap transmission system because of some system failures.

 The POB has a multiple friction-disk pack. Splines connect the stators to the POB casing and the rotors to the shaft in the center of the POB. Springs hold the friction disks together. When hydraulic pressure is applied to the POB, the friction disks are disengaged (against the pressure of the springs). To remove the POB, you must remove the related hydraulic motor first.
 (c) Valve Block
R (Ref. Fig. 011)
 The flap PCU has two valve blocks which are electrically controlled. Each valve block controls the flow of hydraulic fluid to its related hydraulic motor and POB.
 The Linear Variable Differential Transducer (LVDT) is installed on one end of the valve block. The LVDT supplies a signal to the SFCC so that the SFCC can monitor the position of the control valve spool. Installed on the valve block opposite the LVDT are two directional solenoid valves and one POB solenoid valve. The directional solenoid valves operate as the extend or the retract solenoid valves. The POB solenoid valve operates as the brake solenoid valve.
　
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