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 The gear housing is bolted to the actuator housing and contains a bevel gear assembly and a pinion shaft. The bevel gear assembly includes a spur gear which engages with a spur pinion. This has a quill drive that engages with the input shaft of the Assymetry Position Pick-off Unit (APPU). The pinion shaft is splined with a bevel pinion at each end. At one end the bevel pinion engages with the bevel gear assembly in the gear housing. At the other, the pinion engages with a bevel gear in the bevel gearbox. The bevel gearbox is bolted to the gear housing.
 The torque limiter housing contains an input shaft and a torque limiter and is bolted to the bevel gearbox. The input shaft connects to the bevel gear in the bevel gearbox. Drive is transmitted from the input shaft to the bevel gear through six drive-balls.
 The torque limiter housing can be installed in one of two positions. One position is for a LH wing configuration, the other is for a RH wing configuration.
 The actuator assembly (offset gearbox and rotary actuator) is lubricated with semi-fluid grease and is filled through a vent plug in the actuator housing.
 (2) Torque Limiter - Track 4
 The torque limiter prevents a torque-overload if there is a
 malfunction in the flap drive system. The torque limiter has:

 -a ball ramp device
R 1EFF : 062-099, 106-149, 151-199, 204-299, 1 27-54-00Page 71 1301-399, 401-499, 1Aug 01/05 1 1 1CES 1

 -five earthed plates
 -six friction discs
 -two groups of six spring discs
 -
a thrust cup

 -
a lockout indicator.

 The ball ramp device gives axial movement of the hub when the bevel gear turns at a lower speed than the input drive shaft. The device is a coupling made by three balls. These are installed between the hub and the input shaft in machined grooves (ramps).
 The earthed plates and the friction discs are installed on the hub. The spring discs and the thrust cup are installed on the input shaft.
 The lockout indicator gives a visual indication that the torque limiter has operated. It has a lockout indicator arm and a plunger. These are operated by movement of the thrust cup.
 (a) Operation
 Input from the torque shaft is transmitted from the input shaft to turn the bevel gear through the ball ramp device. Output from the bevel gear turns the pinion shaft which operates the bevel gear assembly and the rotary actuator. The spur gear on the bevel gear assembly transmits an input through the spur pinion and the quill drive to the APPU.
 During usual operation, the input shaft, the hub, the bevel gear and the friction discs turn at the same speed. If the torque reaction at the rotary actuator is too high, it causes the bevel gear to turn more slowly than the input shaft. This difference in speed causes the hub to move the balls up the ramps in the input shaft and the hub. When this occurs, the hub moves against the pressure of the spring discs. This compresses the friction discs against the earthed plates and causes the unit to lockout.
 When the torque limiter is compressed, the thrust cup moves against the pressure of the spring discs. The thrust cup touches the plunger which extends the lockout indicator arm. This gives a visual indication that the torque limiter has operated. The indicator arm stays extended until it is pushed in manually to cancel the indication.
 The system can be set again by operation in the opposite
 direction.

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 (3) Rotary Actuator - Track 4
 (Ref. Fig. 023A)
 The description and operation for the track 4 rotary actuator is the same as that for the rotary actuator at track 1.
 **ON A/C ALL
 K. Flap Carriages
 **ON A/C 001-049, 051-061, 101-103, 201-203,
 (Ref. Fig. 029)

R **ON A/C 062-099, 104-149, 151-199, 204-299, 401-499,
 (Ref. Fig. 029A)
 **ON A/C 301-399,
 (Ref. Fig. 029B)
 **ON A/C ALL
 (1)
 Carriage - Track 1

 The carriage at track 1 is machined from aluminium alloy forging. Four vertical-load and two side-load rollers hold the carriage on its track. The rollers are lubricated through grease points on the carriage.

 (2)
 Carriage - Track 2, 3 and 4

 The carriages at tracks 2, 3 and 4 are machined from aluminium alloy forgings. All three carriages are almost the same. Six vertical-load and four side-load rollers hold each carriage on its track. The rollers are lubricated through grease points on the carriage. A fail-safe hook keeps the flap on the track if there is a structural failure of the carriage. Bolts attach the carriages to the flaps. The bolts have eccentrics which let you adjust the flaps.
　
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