(a)  
On some airplanes the exhaust gate actuation mechanism consists of two pushrods and a mechanism assembly. The mechanism assembly is attached to the midflap at the front and rear spars. The forward pushrod that is attached to the foreflap, moves the forward part of the mechanism. When the forward part of the mechanism moves past a certain position, it moves the aft part of the mechanism. As the aft part of the mechanism moves, it moves the aft pushrod which moves the exhaust gate.

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 737-300/400/500MAINTENANCE MANUAL
OUTBOARD
OUTBOARD
MIDFLAP
FOREFLAP INBOARD FLAP
OUTBOARD
OUTBOARD TRACK FAIRINGAFTFLAP
TRACK FAIRING SEE A
FOREFLAPFLAP TRACK SEQUENCINGFORWARD CARRIAGEFAIRING
FOREFLAP
MIDFLAP TRACK MIDFLAP CARRIAGE
MIDFLAP
FLAP TRACK AFTFLAP PUSHROD
FAIRING SUPPORT ARM
BELLCRANK
BELLCRANK AFTFLAP
CAM TRACK
FAIRING CAM TRACK
FLAP TRACK AFT FAIRING
A
Outboard Trailing Edge Aftflap Drive Mechanism Figure 4
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 737-300/400/500MAINTENANCE MANUAL

MIDFLAP FOREFLAP
AFT PUSHROD

Outboard Trailing Edge Flap Exhaust Gate Actuation System
Figure 5

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
 D.
E.
F.
A
737-300/400/500MAINTENANCE MANUAL
 (b)  On other airplanes the exhaust gate actuation mechanism consists of three pushrods, a link, a mechanism housing, a bellcrank, and a cam. The housing assembly is attached to the midflap between the front and rear spars. The forward pushrod that is attached to the foreflap, moves the link that is attached to the cam through the center pushrod. As the cam turns past a certain position, a follower on the bellcrank moves the bellcrank and the aft pushrod moves the exhaust gate.
The foreflap is a monospar structure with a honeycomb trailing edge panel and clad aluminum skins. Three curved support beams extend through the lower surface and connect to three foreflap tracks. The foreflap tracks slide on roller bearings mounted to midflap structure. On the inboard foreflap, a toggle assembly is attached to a torque tube at each end of the foreflap. On the outboard foreflap, two toggle assemblies attach to fittings on the lower surface.The aftflap is a monospar structure with a honeycomb trailing edge panel and clad aluminum skins. Four carriages are installed on the leading edge of the aftflap. Each carriage consists of two roller supports, four eccentric bushings, and eight roller bearings. The carriages roll along curved tracks mounted on the rear spar of the midflap. Four of the roller bearings are supported by the eccentric bushings. Two aftflap drive mechanism pushrods attach to the leading edge of the aftflap.Each trailing edge flap is driven by two transmission assemblies attached to the midflap (Fig. 1). As the flaps extend, the aftflap immediately moves relative to the midflap to form a slot between the two segments. The inboard aft flap is actuated by the drive mechanism contained in the midflap (Fig. 2). Midflap extension rotates the aftflap drive mechanism cable drum. Rotation of the cable drum moves the bellcranks to which the aftflap pushrods are attached, thus positioning the aftflap. The outboard aftflap is actuated by a drive mechanism contained in each of the two flap track fairings (Fig. 4). Each drive mechanism consists of a fairing support arm with cam follower, two fairing cam tracks, a bellcrank cam track, a bellcrank with cam follower, and an aftflap pushrod. The fairing support arm is rigidly attached to the midflap carriage. The bellcrank is mounted on and pivots about the fairing support arm. The bellcrank cam track and the fairing cam tracks are mounted in the flap track aft fairing. Motion of the midflap moves the fairing support arm cam follower in the fairing cam tracks, causing the flap track aft fairing to pivot. As the fairing pivots, the bellcrank cam track repositions the bellcrank. This moves the aftflap pushrod to actuate the aftflap. The foreflap is actuated by foreflap toggle assemblies. The toggle assemblies ride on the corresponding midflap carriages until the midflap reaches a position corresponding to 8 units. At this point, aft movement of the toggle assembly is stopped by a lug protruding from the upper surface of the flap track. The forward roller bearing on the toggle assembly drops in a detent on the flap track locking the foreflap into position. As the midflap continues to extend, a slot forms between the foreflap and midflap. As the midflap approaches full travel, the aft flap again moves relative to the midflap increasing the slot between the two segments.
　
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