R **ON A/C 001-049, 051-099, 101-149, 151-199, 201-299, 401-499,
 The electrical connector block is installed on the reduction gear housing. The electrical connector block has two connectors, one for each synchro transmitter. The connectors are identified as A and B. The cover plate is installed on the reduction gear housing. There is a window in the cover plate to monitor adjustment of the FPPU to zero.
 When the input shaft turns through 140 revolutions it gives 360 deg. synchro transmitter output. For full travel of the flaps, the angular output of each syncro transmitter is 251.97 deg.
 To adjust the FPPU electrically to zero, no electrical test equipment is necessary.
 For zero adjustment, there are three moving and three fixed indicators:
 -two fixed pointers on the reduction gear housing
 - one zero mark on the driving gear
 - one orange zero indicator
 - one fixed zero mark on the input shaft locking plate
 - one zero mark on the end of the input shaft.

 **ON A/C 301-399,
 The electrical connector block is installed on the reduction gear housing. The electrical connector block has two connectors, one for each synchro transmitter. The connectors are identified as A and B. The cover plate is installed over an opening in the reduction gear housing. There is a window in the cover plate to monitor adjustment of the FPPU to zero.
 When the input shaft turns through 140 revolutions it gives 360 deg. synchro transmitter output. For full travel of the flaps, the angular output of each syncro transmitter is 242.1 deg.

 To adjust the FPPU electrically to zero, no electrical test equipment is necessary.
 For zero adjustment, there are three moving and three fixed indicators:
 -two fixed pointers on the reduction gear housing
 - one zero mark on the driving gear
 - one orange zero indicator
 - one fixed zero mark on the input shaft locking plate
 - one zero mark on the end of the input shaft.

 **ON A/C ALL
 F. Asymmetry Position Pick-Off Unit (APPU)
 (Ref. Fig. 018)
 The two APPUs are the same as and interchangeable with the FPPU.
 G. Wing Tip Brake
 (Ref. Fig. 019)
 The WTB is an electro-hydraulic, pressure-on disc-brake. The WTB has:
 -
a central housing

 -
a friction disc pack

 -
a through torque shaft

 -
two hydraulic manifolds

 -
two annular pistons

 -
two solenoid valves

 -
two electrical connectors.

 The central housing contains the friction disc pack which has an alternate stator and rotor discs. The central housing holds the stator discs, external splines on the torque shaft drive the rotor discs. The internal splines at each end of the torque shaft engage with the flap transmission system. At each end of the central housing is a hydraulic manifold which contains an annular piston. The torque shaft passes through the center of the two pistons. A solenoid valve and an electrical connector are installed on each manifold.
 A special hydraulic system supplies each hydraulic manifold. The solenoid valves control the supply of fluid pressure to the pistons. When the solenoids are energized, the fluid pressure moves the piston to release the spring force and puts the brake on. When the solenoids are de-energized, the fluid pressure returns through the solenoid valves and lets the brake off.
 1EFF : ALL 1 27-51-00Page 34 1 1 Aug 01/04R 1 1 1CES 1

 Asymmetry Position Pick-Off Unit (APPU) Figure 018
 1EFF : 1 1R 1CES  ALL  1 11 1 27-51-00 Page 35 May 01/04

 Wing Tip Brake Figure 019
 1EFF : 1 1R 1CES  ALL  1 11 1 27-51-00 Page 36 May 01/04

 Leakage of fluid past the piston seals returns through a drilled hole. If hydraulic pressure is not available to one piston, the remaining piston gives sufficient force to act against the spring to let the brake off.
 H. Flap Interconnecting Strut

R **ON A/C 001-049, 051-099, 101-149, 151-199, 201-299, 401-499,
 (Ref. Fig. 020)
 **ON A/C 301-399,
 (Ref. Fig. 020A)
 **ON A/C ALL
 The flap interconnecting strut has these functions:
 -
it lets the inner and the outer flaps move independently by a specified limit

 -
it gives a different load path for the flap drive system if there is an attachment failure

 -
it sends data to the SFCC when the independent movement of the inner and outer flaps is more than the specified limit

 -
it absorbs energy if a flap drive disconnect occurs.

 The flap interconnecting strut has:
　
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