Work Day 31st July 2021

T86

Many small tasks progressed with, painting the waveguide desiccator clamps black, sections of not easy to access waveguide, also a start made painting the waveguide supports on the aerials.

Stripping old paint off the stainless steel positioning spigots on the aerial beam was carried out.

A problem with repainting the aerial assembly is that it shows up items we would not have considered for refurbishing. An example; the Perspex covers for the aerial elevation position indicators, see below.

The metal covers and the Perspex viewing windows have been removed for refurbishing away from Cosford and the corrosion shown in the photo will be treated before reassembly. Usual problem with refurbishing such items, dirt and old paint.

No apologies for another photograph of the aerials.

LCP

The remaining ‘R’ clips have at long last been fitted to the roof support struts! A spare Harrison X150 amplifier in the LCP has been removed for testing. We have a total of three X150 Boost Blast amplifiers, originally thought to only have two!

The simulator was not run yesterday.

Away from Cosford

LCP:

A few long outstanding tasks remain to be tackled and a start has been made. The LCP roof join canvas securing clamps are being refurbished and painted. This photo shows three of these clamps, stripped of paint.

They are copper bars with brass on one side and besides old paint they are heavily tarnished. The clamps must have been nice and shiny when new! There are 33 of these clamps (I suspect there are a few spares). Also being refurbished are the alloy plates that secure the leather retaining straps for the canvas roof cover. Needless to say the original overall canvas roof was not with the LCP and the canvas roof join covers have completely rotted.

T86:

For the future display and moving of the T86, plus current refurbishing work, it is important to understand aerial movement, braking, aerial removal and pedestal retraction. The aim is to interpret the information contained in T86 APs and create a set of notes on these topics relevant to the operations just described. Currently, -24V supply has been restored (not using the original D Rack and F Rack power supplies) so that indicators, pedestal microswitches and aerial brakes operate. This photo shows the Pedestal Indicator Unit, the lamps indicate aerial positioning and overrides.

A priority task is to document when these lamps come on in relation to the bearing position indicator, dials graduated in mils. One example, the Limit Override lamp stays on irrespective of operating the Limit Override switch on the console (D Rack). Why? The T86 APs have wiring diagrams and testing procedures but we do not have information on the processes and procedures we need – unless we don’t have the right APs!

Pete H

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