Work Day 25th February 2017

Neil and Pete H. focused their activities around two main tasks yesterday – completing the priming of cable duct covers and their fittings and more importantly a start was made on repairing some damage to the frame of the LCP cabin.

Damage was caused to the cabin frame when the cabin was being lifted without a spreader bar. The damage occurred several years ago but as restoration of the cabin will be completed over the next few months the time had come to carry out the frame repairs. The photo shows the section of the cabin’s frame most severely damaged being straightened before the skin is repaired.

LCP Cabin - Repairing Damage wm.jpg

Here are the LCP cabin awning support frames and below the cable duct covers after priming or part primed, they’ll be as good as new!

lcp-cabin-roof-awning-supports-wm

LCP Cabin Cable Duct Covers - Primed wm.jpg

The simulator was run up and ran for 2.5 hours without any problems. One reason for running the simulator was to test a Serial to Parallel PeriBus card, three of these cards are used in the I/O rack for the Argus 700. The card being tested had been repaired using the developed PeriBus simulator which sends the correct logic and timing to a Serial to Parallel PeriBus card (and other I/O cards) for bench testing. The repairs carried out to the card were the replacement of two TTL devices and re soldering of a dry joint. The repaired card ran in the simulator with no problems so has been declared ‘Serviceable’.

 

 

Work Day 18th February 2017

The main task was to complete the restoration of several budget locks for the LCP cabin’s cable duct covers. Some of the original budget locks were very badly corroded and are being replaced with second hand locks which in turn are corroded but not as bad as the originals! Accompanying photos show the ‘new’ budget locks de rusted, cleaned and primed, note the pitting and wastage cause by corrosion.

Cleaned Budget Locks wm.jpg

Budget Locks Primed wm.jpg

Budget lock fitted to a dust cover:

Duct Cover - Positioning Budget Lock wm.jpg

Tasks are also being carried out on the T86 cabin, the latest being the restoring of the lenses for the main lights on the cabin. Copious amounts of paint stripper were used to remove paint to get them to the condition shown in the accompanying photo.

T86 Light Lenses wm.jpg

Off-site work continues with development of test equipment for the Argus computer peripherals. We have schematic and component placement diagrams but no test specifications.

The main effort at this time is development of a PeriBus simulator, the aim being to create a test set to fault find on the Argus 700’s I/O system. Accompanying photos show the current status of the PeriBus Simulator, built from TTL on prototyping boards and an Analogue I/O chassis under test. The Analogue I/O chassis has just the Serial to Parallel PeriBus Converter card (on an Extender Card) and a Termination card fitted to allow testing of the Serial to Parallel PeriBus Converter which is known to be U/S. Currently the PeriBus Simulator is working in that it provides the correct bus timing and logic, it is now a case of creating a test routine. Logic levels created by the PeriBus Simulator are being ‘scoped’ on the Serial to Parallel PeriBus Converter card. Obviously this is still work in progress.

PeriBus Simulator wm.jpg

Serial to Parallel Peribus Converter wm.jpg

Yet more pop rivets, nuts and bolts have been acquired in preparation for reassembling the fittings to the LCP cabin.

The LCP cabin was heated for the day but the simulator was not run.

Work Day 11th February 2017

Yesterday was definitely a ‘keep the hangar doors closed’ on a wet and miserable day with snow and sleet showers. It felt quite snug in the hangar, at least compared to outside.

The refurbishment of the LCP cabin ‘attachments’ continues. Such tasks always take longer than you think but we are getting there. The objective is to get everything in A1 condition before refitting along with a complete set of ‘bits’, rivets, nuts and bolts washers etc. so refitting will be a straight forward task on the day. This week’s photos shows a few of the tasks carried out on Saturday:

Duct Cover Securing Plate – An example of a metal fitment used within a duct cover. In this case both bolts were so badly corroded they sheared when trying to remove them, the remains being hacksawed off. Attempts to drill out the old bots got nowhere so the plates, there are two of them, will be remade in aluminium.

Duct Cover Securing Plate wm.jpg

Half a Duct Cover – A salvaged cover that is replacing a missing cover. To complete the refurbishing of this item the missing hinges have to be replaced along with the badly corroded and missing rivets.

Half of Duct Cover (Mains) Missing Hinges wm.jpg

Polished LCP Canvas Support – Neil continued with his mission that he should be able to see his face in all metal items before they get repainted!

Polished LCP Roof Canvas Support wm.jpg

Away from the hangar the purchase of ‘bits’ continues including new pop rivets, nuts and bolts, etc. One change being made is that all the original nuts and bolts securing the canvas frames that had castellated nuts secured with split pins will be replaced with nylon lock nuts and washes will also be nylon instead of metal. A decision partly due to our lack of engineering facilities to drill bolts to take split pins.

Also away from Cosford: The development of a PeriBus simulator continues apace and nears completion. The purpose of the simulator is to create a test rig for the testing of the I/O cards for the Argus 700 where addressing and data can be set to exercise functionality in I/O cards. The current status of this project is that the PeriBus simulator is about to be connected to a spare Analogue box to see if it can provide an input that can be seen by the Serial to Parallel Converter card in the Analogue box. Watch this space!

The simulator was not run on Saturday but a fan heater was run in the LCP to warm it through.