Avionics – expert check

As Jersey is pretty self contained we are not exactly overrun with avionics experts so when Adrain (Norman) pops over for his regular visit he is definitely a man to catch.

Having got the Trig all working I still wanted to get an expert check over and he kindly offered to give it the ‘critical’ eye .. Again .. He does this all day every day .. I put new systems into Trust companies and Banks …

We spent a while reviewing my wiring techniques and the Trig units and general setup. Before he came I spent a while routing and re routing the working harnesses to give what I felt was a more professional setup and appearance. This meant copious but managed use of cable ties but I found this bit to be quite therapeutic .. There’s something about routing and wrapping cables that makes the whole thing suddenly feel closer to THE day of readiness

image

Had riveted the above PTT earthing in but advised that a a screw would give better long term earthing

Cables neatly tied and routed I could ask Adrian ‘dumb’ questions about intercom cone connectivity and how PTT should earth through the body and tie off on Trig connectors. I was genuinely surprised when all those pins and PTT and earths worked first time !

I had riveted the little headset and phone brackets to the down tube in front and rear cockpits and they looked rally neat and unobtrusive but my long term mentor Mike (F) had noted that a single bent flap of alloy with two rivets over time would work loose with people pushing and pulling headsets in and out .. In fact one was showing small signs of flex already .. So these were removed and new ones made with a wrap around design and 2 rivets front and 2 rear … Nothing is going to move these now !

imageimage

image

Adrian did pick up my inability to completely cut the edge off the cable ties .. Indeed my son Benjamin who works for Williams F1 noted that one of his mentors in engineering used to drag the backed his hand over ‘completed’ cable ties to make the point ! I now know how much to cut off !

Adrian finished with a full check of the transponder using his specialist kit .. You could see nice big fat readings of all key bits so happy days !

imageimage

Inspector – pre LAA paper sign off

Bob .. My local inspector .. Did the final full pre check with me a couple of weeks ago

He was very thorough .. Of course … And it did feel like an end of school .. See me later moment ! But just like your IMC renewal .. We treated it as a big exercise in engineering … Explaining the background to why he might pick certain things up and why not.

in general he was very happy with what had been done and very complimentary which was mildly embarrassing ! But a nice feeling when ‘cross professions’ meet and compliment 😃

There were, of course, some items to review.

  • He wasn’t happy with 2 or 3 wing rigging cables .. They were nice and tight but the number of threads showing were a little too many
  • This caused some discussion later with another local engineer which was fascinating and informative .. How many threads is enough !? .. One theory is that the diameter of the thread and the nut it’s going into have a proportionality .. Ie once it starts to bite .. 4 full turns and you have gained maximum connection strength .. After that the shear strength will not be enhanced by further turns …. I guess the difference here is that a turnbuckle has a deeper body than a nut so naturally holds more thread BUT I guess the ‘mechanics’ STILL dictate that the weak point – once threaded in by however much- is still that the bolt / thread will shear irrespective of how far in the body it is ! ?
  • Is t engineering amazing ! why isn’t it mandatory on all school syllabuses !!!!
  • Anyway .. Cos the Boss wasn’t happy they were replaced .. He was quite right as was PHS .. Don’t want to become a statistic in GASCO !
  • He also noted that a couple of the 9 aileron bolts were a bit long and could be shorter .. Not impeding but did look long when you step back and compare .. One also just made it to the nyloc so was just too short – easy fix
  • i had left the split pins out of the rudder as I had intended to remove it again .. But once up at the airport I felt loads of rigging and de rigging was educational but not conducive to letting her ‘settle’ and I had missed putting them back in before he inspected ! Rooky error !

That was pretty much it so not too much to tidy before the letter can go to the LAA

So why the gap …

So close to finishing and yet work has managed to got through the roof along with what I call normal flying !

At work we have what is called a Management Buy Out which basically means that the years of frustration trying to get funding for big or small business change projects and programmes suddenly disappear and you can do all those exciting meaningful add value projects and get the resource to do it .. Means a very busy three years but hey .. Better than being bored …

The other, nicer part is that because I spent over 6 heads working for the government out here I met and now know loads of people in all sorts of roles … From our Chief Minister (equiv of Prime Minister) through all he various ministries and departments.

This means I get asked if I can pop various politicians over to various French locations for political meetings and events. The recent Somme commemorations saw a contingent from Guernsey and Jersey, various Heads of government needing to be picked up and ferried to Abbeville and Caen and Cherbourg and back. All this in a week where we generally had BKN below 100 .. Made for some interesting and challenging flying … Did about 15 hours flying last month, including a business hop to Luxembourg .. Long way in a PA28 ! And around 5 hours IMC .. Which is all good practice for Jersey approaches !

Have managed to secure the ability to work late at night in the hangar which is great for big catch up completions ….. To follow in blog ….

Trig – completion and testing

Well, after many hours of careful preparation and meter continuity testing of the two prime D plugs it came to the time to connect up. Realised I had managed to run out of positive bus connections so a brief pause whilst I change the behind the panel bus bar to give me up to 10 locations.

I also changed from the screw type connector block to a crimped ring connector with a handshake fly lead .. This means I can isolate and fully remove any powered item without affecting any others.

First power up and bingo .. All lights up … Default frequencies were changed to add 134.67 the ATIS for Jersey and then 119.45 (Tower) and

Engine cooling

They say 98% complete only 20% left .. But it does really feel nearer 5% now !!!

Another little but key job to get completed the rubber cooling duct bleed surround on the intake shrouds. Once glued I aim to secure every say 5 cm or so with a rivet and backing washer

image

Trig set up and test

Having setup the Trig Radio and Transponder it was time to final pin check and then setup for power only to realise id run out of main bus power points.

A short delay whilst I extend the bus bar to have a new setup .. Allowing for up to 10 points each with ringed connectors in preference to screw fit and also handshake fly leads meaning I can disconnect any power source in isolation of other elements.

Locate and temporarily connect the headphone mic sockets and crackle and we have life !

image

Then first power up and set the Jersey ATIS 134.67 and loud and clear …

Then press and hold the Function button on the transponder to setup the Config .. Very straightforward .. What fantastic equipment this is … Worked from first connect

image

I now have my imbedded call sign in G-SWAB 😃😃

Spinner – additional security

Added a couple of additional tabs to the spinner backplate with rivnut fitting to allow two opposite support fittings for spinner … These provide additional rigidity to the existing centre bolt fitting

image    imageimage

Trig wiring

Trig Radio and Transponder bits going in … Cut dash to accept both heads and fitted the base behind the pilot seat. Cable routed around body struts and now removing the pre tinned bits I did as Adrian advised me that the crimper will expect to crush onto cables NOT tinned .. Which might prevent proper crimping !

Manual in hand and pins and crimper at the ready .. Adrian also advised to butt the outer cable close to the end of the pin

image   imageimage  image

Many thanks to Paul HS for the kind loan of the superb Crimpers !

Update 6 June – OK – I worked through the night the other night – all excited to get to this part – makes it so much more real …. and, having crimped on the females to the radio thought lets crack on and use the remainder of the pins to do the Transponder … Oops – managed to use the wrong gender (females) so am now short of said item.

Looked on RS and wasn’t sure they looked the same and no one in Jersey will have them I guess so a quick call to Trig. What an amazingly helpful, polite team they are… lady answered just before 1800 (and I thought I might have to leave a message). She kindly passed me on to James who couldn’t do more to help .. sure he would pop some spares in the post – tomorrow OK ? – simply perfect !

We also had a chat about what aircraft they were going in and how it was progressing and the sort of support they offer after sales. Really good solid Company ! Many thanks guys.

LAA last bits

The LAA kindly followed up on my penultimate submission (Jon Viner .. He’s really good and responds by email almost by return) .. The ‘final’ bits they want are some photos of the carb heat fitting and also evidence of how I know it’s working … I plan to put warning lights on the panel for both heater elements …

also photos and description on how I have secured the tail ballast

image

image   image

Taxying

My original taxi checks had proved interesting as what had seems like good brakes turned out to be quite soggy !

Mike and I had a look and tightened up a few parts so they became much more firm and solid affair.

So these were re tested today. Took the checks away and started her up .. She start so sweetly … First turn every time !

Then waited for the relatively busy area outside the Jersey Aero Club to settle …this area is a strip of Tarmac in front other hangers quite short and quite narrow … Should be a good test and if it all goes to pot .. Just shut down .. Jump out and turn her by hand.

i should not have worried  … I temporarily disconnected the steerable Tailwheel to leave her castoring and, with differential brakes, she nipped up and down .. With careful but beautifully tight right hand turns. The Stampe used to react quite positively to blips of throttle but I don’t want to use too much in such a confined space with about 8 aircraft all around.

Spent a very happy 20 minutes going up and down and around to the left then around to the right .. All turning in her own length ! great .. And I feel so much more confident now about popping into the active taxiway at Jersey … Don’t fancy holding up and Easyjet of BA airbus whilst I ground loop ?!

At the end of 20 mins I stopped as I could hear a graunching sound .. Turned out to be hot brakes ! but hey it had been on them the whole time against power … Very pleased with the result !

Blog at WordPress.com.

Up ↑