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Technical Information

Catalogue No: C1356
Category: Flight Control
Object Type: Actuator
Object Name: Servo-Surface
Part No: 15653-2A
Serial No: 3091050
Manufacturer: Bendix
Division: Eclipse-Pioneer [of Bendix]
Platform(s): BAC 1-11
Year of Manufacture: circa 1968
Dimensions: Width (mm): 200
Height (mm): 330
Depth (mm): 130
Weight (g): 0
Location: R&S Display Cabinet

S.A.E. Spec. AS402. TSO-C9b
Type No. 15653-2A
Wt. Lbs. 17
Serial No. 3091050
The Bendix Corporation
Eclipse -Pioneer Division
Teterboro, New Jersey
Made in U.S.A.


This unit is a servo unit driving one of the VC10 control surfaces; it is also called a Pulley Servo Wheel Assembly. It was certainly used on the VC10 and possibly also on the BAC 1-11.
This unit has a calibrated disc on the output shaft which presumably gave a reading of the control surface angle in 0 to 360°.

The BAC 1-11 AFCS, like that in the VC10, was based on the well proven Bendix PB-20 Autopilot and was designated the Series 2000 AFCS. New features over the PB-20 system include separate pitch and azimuth control computers, a modular Air Data Sensor and a range of units specifically designed for autoflare and autolanding.

Each unit in the BAC 1-11 AFCS is built to a common configuration with circuit modules arranged in stacks either side of the chassis. The stacks are connected by plugs to a mother board and are physically separated into ‘command’ and ‘monitor’ functions to preclude common failures. The computers are entirely solid state and there is a high degree of built-in-test. Self-monitoring techniques and multiple channel redundancy are used to give automatic failure survival in approach and cruise flight.

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