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BAC 1-11 Torque Limiter Adapter

Technical Information

Catalogue No: C1090
Category: Flight Control
Object Type: Signal/Data Processor
Object Name: BAC 1-11 Torque Limiter Adapter
Part No: 3034-A-1
Serial No: 008/64
Manufacturer: Elliott Bros (London) Ltd
Division: Unknown
Platform(s): BAC 1-11
Year of Manufacture: 1964
Dimensions: Width (mm): 125
Height (mm): 200
Depth (mm): 540
Weight (g): 5,940
Location: Rack RAA01 [Main Store]

Torque Limiter Adaptor
Type. No. 3034-A-1
Ref. No.
Ser. No. 008/64
Torque Limiter Adapter
[Mods] 0 & 2
Elliott Brothers (London) Ltd.


The Torque Limiter Adaptor limits the effect of autopilot malfunctions or produces an autopilot disconnect following a malfunction thereby allowing the autopilot to be used at low altitudes. The box receives signals from the Glide Slope Receiver, Vertical Gyro, Three Axis Rate Transmitter and the Controller.

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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