(2)
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 flap segment is attached to the inboard edge of the midflap. Four tracks mounted on the rear spar protrude through the trailing edge beam to support the aftflap. (See figure 3.)
(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.
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27-51-0 Page 4 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. May 15/69
D. 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.
E. The aftflap is also 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.
F. Each trailing edge flap is driven by two transmission assemblies attached to the midflap. (See figure 1.) As the flaps extend, the aftflap immediately moves relative to the midflap to form a slot between the two segments. The inboard aftflap is actuated by the drive mechanism contained in the midflap. (See figure 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. (See figure 3.) 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
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