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Technical Information

Catalogue No: C1518
Category: Flight Control
Object Type: Actuator
Object Name: Servo-Surface
Part No: 15653-2A
Serial No: 7081000
Manufacturer: Bendix
Division: Eclipse-Pioneer [of Bendix]
Platform(s): BAC 1-11
Year of Manufacture: circa 1968
Dimensions: Width (mm): 120
Height (mm): 210
Depth (mm): 260
Weight (g): 7,680
Location: Rack RAA02 [Main Store]

SAE Spec. AS 402 TSO-C9b
Type No. 15653-2A
WT 17 LBS Serial No. 7081000
The Bendix Corporation
Eclipse-Pioneer Division
Teterboro New jersey
Made in USA


This unit is a servo unit driving one of the BAC1-11 control surfaces; it is also called a Pulley Servo Wheel Assembly.

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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