G11446G11464 G11471
Inboard Trailing Edge Aftflap Drive Mechanism  506 
27-51-0  Figure 2 (Sheet 1)  May 15/69 
Page 6 
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 

506  Inboard Trailing Edge Aftflap Drive Mechanism 
May 15/69  Figure 2 (Sheet 2)  27-51-0 
Page 7 
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 

Outboard Trailing Edge Aftflap Drive Mechanism  500 
27-51-0  Figure 3  Nov 15/67 
Page 8 
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 

fairing pivots, the bell crank cam track repositions the bell crank. 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 the 8 unit position. 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 aftflap again moves relative to the midflap increasing the slot between the two segments.
G.  The angle of flap extension is measured relative to the wing chord plane. When the flaps are fully retracted, the trailing edge of the aftflap is aligned with the wing chord plane. When the flaps are extended to 40 units, the angle between the wing chord plane and the midflap is approximately 43 degrees. Since the aftflap moves relative to the midflap, the aftflap rotates to an angle of approximately 69 degrees from the wing chord plane.
3.  Flap Tracks and Fairings
A.  The flap tracks are curved forged steel beams which are mounted on the lower surface of the wing. A flap transmission assembly is mounted on each flap track (Fig. 7). The tracks and the transmission assemblies are housed in aerodynamic fairings.
B.  Each outboard flap track is contained in a two piece fairing made from aluminum frames covered with fiberglass or graphite reinforced kevlar skins. The forward section of the fairing is rigidly attached to the wing. The aft fairing section rotates about a hinge support mounted on the main flap track. Two fairing actuator tracks and an aftflap sequencing track are mounted in the aft fairing section. Rollers on a support arm on the midflap carriage engage in the two fairing actuator tracks. The tracks act as cams which rotate the aft fairing downward as the outboard flap extends. A retractable landing light mounted in the aft outboard fairing extends as the fairing rotates downward. The aftflap sequencing track is used as a cam for the aftflap actuating mechanism. The rear portion of the aft fairing is detachable.
C.  The tracks for the inboard flap are contained in fixed fairings. The inboard flap outboard track is contained in the engine nacelle fairing. The inboard flap inboard track is contained in the wing to body fairing. Tubular supports between the midflap carriages and the midflap pass through openings in the fairings. The openings are curved slots which allow fore and aft motion of the midflap.
532 
Oct 20/83  BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.  27-51-0 Page 9 

4.  Flap Control Lever
A.  A flap control lever located on the upper right side of the control stand regulates the position of the trailing edge flaps. (Fig. 4) The lever assembly consists of a spring-loaded telescoping handle and a cable drum. The cable drum rotates around a shaft in the control stand. A flap control cable attaches to the cable drum. The lever rotates around a quadrant, which has detents at the flap positions. The lever is spring loaded to lock in each detent. Lifting the lever about 1/4 inch releases the lock and allows rotation. The quadrant contains gates at the 1- and 15-unit detents, which prevent inadvertent lever movement past the detent position. The lever must be lowered into the detent and passed under the gate before further rotation can occur. The flap control lever actuates the cable system to drive a cable drum and flap control quadrant in the right wheel well. 
5.  Flap Control Unit
A.  The flap control unit contains the mechanical linkage that operates the flap control valves. The control unit consists basically of an input linkage, two cams connected by a shaft and a cable drum. (Fig. 5)

G11496
Flap Control Lever  521 
　
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