(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 between 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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A 737-300/400/500MAINTENANCE MANUAL

SLAVE BELLCRANK

EXHAUST GATE
Inboard Trailing Edge Aftflap Drive Mechanism
Figure 2 (Sheet 1)

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A 737-300/400/500MAINTENANCE MANUAL
FWD

INBD

AFTFLAP
PUSHROD

MECHANISM BOOM
Inboard Trailing Edge Aftflap Drive Mechanism
Figure 2 (Sheet 2)

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A 737-300/400/500MAINTENANCE MANUAL

Inboard Trailing Edge Flap Exhaust Gate Actuation
Figure 3

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A
737-300/400/500MAINTENANCE MANUAL
 (b)  
On other airplanes the exhaust gate actuation menchanism 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.

 (4)  
The midflap is supported by two flap carriages which ride on the main flap tracks. A tubular support at each end of the flap attaches the flap to the carriages. The carriages are steel forgings to which roller bearings are attached. Four rollers on each carriage support the flap on the flap track. Two side load rollers provide lateral alignment of the carriage on the flap track. A cam track in which the foreflap toggle assembly rides is attached to the carriage.

 C.
Outboard Midflap

 (1)  
The outboard midflap consists of ribs, two spars, a trailing edge beam, two honeycomb trailing edge panels, and clad aluminum skins. A hinged exhaust gate segment is attached to the inboard aft edge of the midflap. Four tracks mounted on the rear spar protrude through the trailing edge beam to support the aftflap (Fig. 4).

 (2)  
Carriage support fittings located between the two flap spars connect the midflap to two flap carriages. The carriages are steel forgings to which roller bearings are attached. Four rollers on each carriage assembly support the flap on the flap track. Two side load rollers provide lateral alignment of the carriage on the flap track. A detent on each side of the carriage retains the foreflap toggle during the first segment of flap extension. A flap track fairing support fitting is mounted on the lower surface of the carriage. Roller bearings on the support fitting engage a track on the flap track fairing.

 (3)  
There is an exhaust gate actuation mechanism installed on the inboard end of the outboard midflap (Fig. 5). As the midflap and the foreflap separate between the 25- and 40-unit position, the actuation mechanism opens the exhaust gate.
　
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