Daily Archives: 18/06/2019

ADAHRS & GMU, Autopilot, Electrics, Oil System, Oil Tank, Sensors, Sensors, System, Wiring

Tuesday 18th June 2019

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Music: The Pretenders – They were the support to Fleetwood Mac on Sunday at Wembley. I’d forgotten how good their music was!

Time for a short break from wiring but not for long before continuing the battle of the wires!

The Rotax engine comes with 4 litres of Aeroshell oil which I thought I’d add to the oil tank as a short break from wiring!
I managed to get 3 litres in the tank but I will need to add more when the engine has been turned over a bit as there are a lot of empty oil pipes at the moment!
After that very short break it’s back to wiring. This is the transponder loom which is a bit overkill for my needs.
As you can see by the coil of wire there is a lot of unused wires but and a lot more has been trimmed from the length of the wires that are used! Once I had checked that it worked as expected I cut the unused wire off and covered the unterminated ends with heat shrink.
Before adding a GPS receiver the SkyViews have no idea where they are in the UK, in fact they think they are in the USA! So I’ve taken the power and serial data leads from both SkyViews, spliced them and will connect them to the GPS.
There’s a lot of cutting of wires and terminating them, mostly with fully insulated spade connectors using a special crimping tool.
Once the GPS is connected a check is made on the connection to make sure it’s not reporting any errors and picking up satellite receivers ok..
…and if by magic the SkyView now knows it’s in the UK! The system is reporting height and position correctly from my checks. If you look at the slip indicator you can see that its not in the middle and that’s because the ADAHRS isn’t quite level. There isn’t an adjustment that can be made to correct this so I’ll shim the unit.
I’ve positioned the aircraft on a piece of level ground and I’ve shimmed the unit to make sure that it’s level and reporting correctly which it now is.