PCU Hydraulic System - Schematic Figure 003 
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 - there is not enough pressure in the related hydraulic system - one of the failures given in (Ref. 27-51-00) occurs. A differential gearbox connects the output shafts of the hydraulic motors and transmits their torque to the power transmission system. If a POB engages and holds its motor, the remaining motor moves the transmission system at half speed but at full torque. B. Power Transmission 
R  **ON A/C 001-049, 051-099, 101-149, 151-199, 201-299, 401-499,
 (Ref. Fig. 001) **ON A/C 301-399,
 (Ref. Fig. 001A) **ON A/C 001-049, 051-061, 101-105, 201-203,
R  (Ref. Fig. 004) **ON A/C 062-099, 106-149, 151-199, 204-299, 301-399, 401-499,
R  (Ref. Fig. 004A) **ON A/C 001-049, 051-099, 101-149, 151-199, 201-299, 401-499,
 (Ref. Fig. 005) **ON A/C 301-399,
 (Ref. Fig. 005A, 006)

 Actuator - Typical Installation
 Figure 004

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 Actuator - Typical Installation
 Figure 004A

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 Flap and Flap Track Fairing - Operation
 Figure 005

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R  Flap and Flap Track Fairing - Operation 
R  Figure 005A 
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 1  1
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R  Flap Tab Hinge Fairings 
R  Figure 006 
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 **ON A/C ALL
 In each wing, the transmission system includes:
 -torque shafts
 -
a right angle gearbox at the wing root. This changes the drive alignment through 90 degrees for input to the track 1 actuator

 -
a line gearbox. This moves the drive path forward onto the rear face of the false rear spar

 -
a 19 degree bevel gearbox. This puts the drive into line with the rear spar

 -four actuators. Each actuator consists of an offset gearbox, a torque limiter and a plug-in rotary actuator
 -a Wing Tip Brake (WTB)
 -An Asymmetry Position Pick-Off Unit (APPU).
 The torque shafts transmit power from the PCU to the gearboxes and actuators. Universal joints connect the torque shafts and steady bearings support them.
 Each input gearbox has a torque limiter which operates in both directions. Each torque limiter has a lock-out torque value set as necessary for its location. The torque limiters protect the wing structure and the actuators from a torque overload which could occur by a flap mechanism failure. A mechanical indicator on each actuator latches if a lock-out occurs. You can set the indicator again when the aircraft is on the ground.
 Drive levers on the actuator output shafts move the flaps through flap link arms. Bolts attach the flap link arms to the flap bottom surface.
 To prevent extension or retraction overtravel each drive lever has mechanical stops. Engagement of the stops does not occur at a time of normal operation.
 Wing Tip Brakes (WTB) give asymmetry and runaway protection (Ref. 27-51-00).

R **ON A/C 001-049, 051-099, 101-149, 151-199, 201-299, 401-499,
 The offset gearbox of the track 4 actuator drives an Asymmetry Position Pick-off Unit (APPU) (Ref. 27-51-00).
 Carriages, which roll freely on staight tracks, hold each flap. Track installation is on beams below the wing. Vertical-load rollers and

 side-load rollers keep the carriages on the tracks. Each carriage has a
 containment device to hold it on the track if a failure occurs.
 The carriages, tracks and beams at tracks 2, 3 and 4 are made almost the
 same. Attached to the fuselage is track 1, which uses a different
 configuration as that at tracks 2, 3 or 4. Attached to the flap bottom
 surface at tracks 2, 3 and 4 are brackets. Connected to the brackets is a
 linkage which operates the hinged part of the track fairing during flap
 extension and retraction.
 At the end of each track are mechanical stops. The stops prevent
 retraction overtravel and makes sure that the flap do not disengage at
 the end of flap extension. Engagement of the stops does not occur at a
　
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