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F-4 Air Data Computer

Technical Information

Catalogue No: C0211
Category: Air Data
Object Type: Signal/Data Processor
Object Name: F-4 Air Data Computer
Part No: 50-059-02
Serial No: 0007
Manufacturer: GEC Avionics
Division: Unknown
Platform(s): F-4 Phantom
Year of Manufacture: circa 1986
Dimensions: Width (mm): 423
Height (mm): 192
Depth (mm): 301
Weight (g): 10,440
Location: Rack RAA10 [Main Store]

G.E.C. Avionics Ltd
Cmptr. Air Data, CPU-143A
PN 50-059-02
Mfr K0656
DsgnAct K0656
Contr F33657-85-C-0025
SerNo 0007
G.E.C. Avionics Ltd
SerNo 1001
Mfr K0656


The CPU-143A shown is optimised for all variants of the F-4 and was manufactured against P’Card F108772. Although this unit is missing some covers and modules, these omissions reveal some of its internal construction.
This item has a space into which the Static Pressure Compensator unit will fit.

In 1981 Instrument Systems Division began the design of a new generation of Air Data Computers designed for the combined USAF and USN Standard Central Air Data Computer (SCADC) programme. The system was designed to fulfil the retrofit requirements of 38 different aircraft types and to do so with only four configurations. The aircraft types include the following:-


A-4M and TA-4J Skyhawk, A-6E/F, KA-6D and EA-6A Intruder, EA-6B Prowler, TC-4C Gulfstream, A-7D/E/K and TA-7C Corsair II, C-2A Greyhound, E-2C Hawkeye, KC-135 Stratotanker, C-5A/B Galaxy, C-141A/B Starlifter, F-111A/E/D/F, FB-111A, EF-111A, F-4C/D/E/G/J/N/S, and RF-4B/C Phantom and the S-3A/B and US-3A Viking. In 1992 an order for a further 290 units was received, being the eighth option, bringing the total procured to 5552 units. 387 units of the SCADC system were at this time being supplied for the F-14 Tomcat.


The high commonality was achieved with a unique software re-configurable design. Output parameters, ranges and scalings are selected for each aircraft type by the software, which recognises the host from a code wired into the aircraft connector pins. The SCADC core hardware set provides over 80% of the hardware in every application and the remainder is addressed by one or two special-to-type modules. A multiplicity of analogue interfaces can be handled and the Mil-Std 1553 DataBus is also a feature. Production commenced in 1985 with first deliveries the following year and in 1989 these deliveries surpassed 4,000 units. In addition in 1988 ISD received the Queen’s Award for Technological Achievement for SCADC.


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