Work Day 24th October 2020

With the repainting of the internal cabin walls of the LCP complete it was a chance to clear it out and create a photographic record. Four accompanying photos show the internals of the LCP taken yesterday.

LCP Entrance

Prismatic Light Diffusers
Repainted Walls and Full-Level Lighting

Repainted Walls and Full-Level Lighting

The LCP’s computer system and display console have not been run for many months so it was time to start switching it on again. The LCP is in an unheated and, therefore, damp hangar. This, coupled with the age of the equipment, means care is needed with switching on in stages with checks at each stage. The Argus 700 computer was first to be switched on and it wasn’t long before its 5V 120A supply failed due to an X2 filter capacitor literally boiling its dielectric. This is a common problem and can be rectified.

Over the past few years some interesting items turn up. We have now found two screwdrivers that will be instantly recognised by anyone who serviced electronic equipment in the RAF, see accompanying photo. Can anyone help identify where these screwdrivers were used, one is marked ‘MS6’ and both have what is assumed to be an inventory number starting ‘BSYY–’.

RAF Screwdrivers with MS6 – BSYY– markings

Off site news:
This is the culprit for yesterday’s smoke screen. It’s one of the later RIFA
X2’s as identified by it’s mottled appearance. Search YouTube with ‘RIFA X2
capacitors’ and lots of videos showing these capacitors blowing up.

X2’s come in different technologies, e.g. polypropylene (MKP). I’ve already
bought some MKP capacitors to replace the problematic RIFA Metalised Paper
capacitors. It is concerning that having checked our power supply records to find that the RIFA X2’s on the 5V 120A PS were definitely changed during the initial power supply refurb program so that capacitor was not that old; or was it new but old stock?

The culprit!

Pete H

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