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
Division: Unknown
Platform(s): BAC 1-11 
Year of Manufacture: 1964
Width (mm):
Height (mm):
Depth (mm):
Weight (g):
Location: Archive Object 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 2000AFCS. 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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