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Technical Information

Catalogue No: C1026
Category: Flight Control
Object Type: Actuator
Object Name: Servo-Surface
Part No: 15653-2-A
Serial No: 102116
Manufacturer: Bendix
Division: Unknown
Platform(s): BAC 1-11
Year of Manufacture: circa 1968
Dimensions: Width (mm): 120
Height (mm): 200
Depth (mm): 250
Weight (g): 7,780
Location: Rack RAA02 [Main Store]

Automatic Pilot System
S.A.E. Spec. AS402 CAA-TSO-C9b
Type No. 15653-2-A
Serial No. 102116
Bendix Aviation Corporation
Eclipse-Pioneer Division
Teterboro, New Jersey
Made in U.S.A.
[repair marks]
MA Service & Repair Division
GAv(R) AS&RD 25


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

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.

Click to enlarge
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