Azimuth Amplifier and Computer

Technical Information

Catalogue No: C0550
Category: Flight Control
Object Type: Signal/Data Processor
Object Name: Azimuth Amplifier and Computer
Part No: 10950-A-1
Serial No: 139
Manufacturer: Elliott Bros
Division: Unknown
Platform(s): BAC 1-11 
Year of Manufacture: circa 1965
Width (mm):
Height (mm):
Depth (mm):
Weight (g):
Location: Archive Object Store

Azimuth Ampr & Computer
Type No. 10950-A-1
Ref. No.
Ser. No. 139
[Mod State] 6


The Azimuth Amplifier and Computer is a ¾ ATR containing all the electronics needed to compute command signals associated with the aircraft azimuth control and has a plug-in adapter unit to set the system parameters.

The Collection holds several of this unit's circuit module types, shown as related items.

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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