|Object Name:||Total Transducer Assembly|
|Division:||Instrument Systems [ISD]|
|Year of Manufacture:||circa 1980|
|Location:||Archive Object Store|
MARCONI AVIONICS Ltd
S/No 0010 MFR K0656
This is a Total Transducer Assembly from the SCADC family of Air Data Computers. There are two similar Transducers for precision pressure measurement; the Static Transducer Assembly (STA) and the Total Transducer Assembly (TT A). Both use Solartron oscillating cylinder transducers and the inherent vibration immunity of this type of transducer makes it an ideal choice for rigorous aircraft environments.
Many thousands of these transducers have been produced for military aircraft programs over the
past decade. Transducer frequency output measurement is accurately performed on the
Transducer Interface Module (TIM). One of each device is fitted to each of the CPU-140A, CPU-141A and CPU- 142A variants, three Transducers are fitted to the to the CPU-143A and four to the CPU-152A.
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.