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Circuit Module

Technical Information

Catalogue No: C0461
Category: Unknown
Object Type: Module/Sub-Assembly/Component
Object Name: Circuit Module
Part No: SA-537-EA2
Serial No: 005/68
Manufacturer: Unknown
Division: Unknown
Platform(s): BAC 1-11
Year of Manufacture: 1968
Dimensions: Width (mm): 76
Height (mm): 118
Depth (mm): 23
Weight (g): 154
Location: 6-Drawer Unit 01 on Rack RAA03 [Main Store]

Ser No 005/68
Connector Keyway:


The function of this module is ‘Amplifier, Filter’ and it is used in the Autothrottle Computer of the BAC1-11 Autopilot.

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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