Catalogue No: | C1609 |
---|---|
Category: | Navigation/Inertial |
Object Type: | Module/Sub-Assembly/Component |
Object Name: | NCS1 Gyro Constants Circuit Board |
Part No: | CD12118 |
Serial No: | 87FJB196/094/R & 87FJB373/245/R |
Manufacturer: | Marconi-Elliott Avionic Systems Ltd |
Division: | Inertial Navigation [IND] |
Platform(s): | Naval |
Year of Manufacture: | circa 1987 |
Dimensions: |
Width (mm): 100 Height (mm): 165 Depth (mm): 15 Weight (g): 135 |
Location: | NCS Side-Room [Mezzanine Store] |
[front]
CD12118AA/B DL Issue 6
[PCB1] 87FJB373/245/R
[PCB2] 87FJB196/094R
Mod Record -
────────────────
[rear]
CD 12118 AA/A Issue 7
CMC
[PCB1] A8106570
[PCB2] 7742258
NSN 6605-99-529-2336
Qty: 2
One of two Printed Electronic Circuits [PECs] from the NCS1 Digital Computer Unit containing Individual Gyro Data for the Naval Compass Stabilizer - one for vertical gyro constants, the other for horizontal gyro constants.
Initially the PEC was designed to be double-sided, i.e. having identical circuits on each side of the board (the through-hole solder joints from the opposite side being clearly visible in each view). The reason being that if one side failed the other side was available, although this very rarely occured. Eventually, obtaining the PROM components proved difficult, so it was decided to only populate one side, thus reducing the quantity of components used.
These PECs were given their own Serial Nos plus that of its associated gyro. This would remain so for the whole life of the gyro. Any repair to the gyro meant its Constants Board would be updated accordingly.
The bare multi-layer PCB assembly was made by the Canadian Marconi Company (CMC) but was populated at Rochester.