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matt
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xx Re: Sea Vixen FAW.2 XJ494 - Progress
« Reply #210 on: Mar 20th, 2009, 1:31pm »

The port ecu will be dry cycled anyway after the stbd ecu goes in as it's not been spun over for a year or so however we'll have to see with the port providing we can get the ignition working then we'll try a series of tests on both

Dry cycle both in turn
Wet run on stbd to check fuel flow
PAUSE to drain off fuel vapour
then ground idle runs on both as i beleive the rigging needs setting up for both engines correct ground idle RPM any higher will have to wait until other systems are back up and running

plus a main wheel change as well to fix the slow puncture on the port side

If only we had a bigger team which sadly we don't when it take you an hour and a half just to get tools set up it doesn't leave a lot of time to get major things done but we've a whole weekend planned for next weekend so you never know
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xx Re: Sea Vixen FAW.2 XJ494 - Progress
« Reply #211 on: Mar 29th, 2009, 7:06pm »

Another update from Matt.

Well the replacement avon is in on it's engine mounts after a whole day struggling with the elements, getting the right equipment and tools out and not having enough hands but in the end and with some gentle persuation

just got to reconnect the numerous wires, cable ,pipes ,firewire ,jetpipe ,fuel , firewalls x2 not a lot then i'm knackered.

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xx Re: Sea Vixen FAW.2 XJ494 - Progress
« Reply #212 on: Mar 29th, 2009, 9:36pm »

matt, weve had 587 @70% on chocks and parking brake, and had no problems with it moving or compressor issues. Ground idle 40-50-% will cause you no issues at all on the chocks. i would get your parking brake working though for good measure, its only a question of getting the green and red systems sorted.personally I would make sure your steering by pass in the nose gear is serviceable. if she jumps the chocks and a brake snatches, with those low slung pipes, she'll do a 360 on you in a flash, if the bypass isn't engaged !
shocked
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xx Re: Sea Vixen FAW.2 XJ494 - Progress
« Reply #213 on: Mar 29th, 2009, 9:55pm »

by bypass i'm assuming you mean steering engaged so that she doesn't caster round like a shopping trolley, i'm hoping to use the nose wheel steering system to test if the hyd are working rather than go for the DT test stright in at the wings. Lets walk before we run. We had to jack the front of the engine back up again as one of the drain 90 degree bends had no clearance to connect it being too close to the door cross member, then the front mount splayed open when we tried to put the bolt back in sea vixen eh nothing simple
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xx Re: Sea Vixen FAW.2 XJ494 - Progress
« Reply #214 on: Apr 2nd, 2009, 9:10pm »

yes mate, exactly!. Im sure 494 knows all about behaving like a shopping trolley! 587 does! yes Vixens indeed, not as bad as the Lightning to work on by any means, but still a pain in the butt, and yes the hyds are dog shit aren't they, badly designed IMO. We have just pinned down a failure of the yellow system to pressurise at all, because of a tiny tiny little seal in the yellow system accumulator gauge, leaking.. bloody awful design....
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xx Re: Sea Vixen FAW.2 XJ494 - Progress
« Reply #215 on: Apr 3rd, 2009, 08:53am »

just a quick one a remember you saying you had an incident with only one wing going up a while back, as 494 has recently done the same, how did you fix yours

I also intend next time to concentrate on functioning the nose leg steering 1) cause it needs to be working 2) cause it'll help bleed the system as it's far enough away from the reservoir. That is of course if we can get a supply of nitrogen to charge the accumulators, my walkround kit just doesn't have the umph to do it, and only delivers about 600 psi max

As i'm not there for a while DT will hopefully be spending some time reconnecting the engine up, especially as we haven't put the airstart connection and left hand ignitor plug on yet, he'll come out walking on his hands or will get stuck head down with his legs uppermost

If only we had more helpers ehhh we'd get a lot mor progress spect it's the same at gatwick occasaionally
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xx Re: Sea Vixen FAW.2 XJ494 - Progress
« Reply #216 on: Apr 3rd, 2009, 5:55pm »

Yes! with 4 runners and another 2 in the pipeline, resource can be a problem!!

Was it the port wing per chance?!! The vixen hyds are exceptionally prone to air locks if you dont keep all the nitrogen levels to the right pressures. Being that the port wing is the furthest away from the resevoir and accumulators, we think that if the the hyds are aireated and lose their muster by the time the wing fold actuators receive fluid. Basically mate heres what you need to do.

1) get all of your nitrogen levels perfect, including the 50 psi resevoir pressures. fill the green system resevoir up to the line on the sight glass. the wing fold jack bodies hold a lot of fluid, and if your levels and pressures are not adequate, forget it, the wings will not go.

2) open the hand pump panel s/b rear trailing underside.

3) select green system, and pump until the hand pump goes solid. all the while have someone watching the green resevoir level on the sight glass in the wheel bay, the green level should go down if the system is badly aeriated. If 494 has been chucking fluid out of the overboard underside drain recently, then your system is aireated badly. That's what casues the fluid to piss out, which exacerbates the problem by robbing the system of even more fluid, and replacing it with yet more air!!

4) select the pressure relief valve in the hand pump bay. you will hear loads of gurggling as the air in the system is forced into the resevoir, the level will go up as the air forces the fluid up the res. after a while the air will pass the fluid and vent overboard.

repeat step 2,3 then top up the resevoir to the mark again.

repeat step 4. this time air and fluid will come out of the overboard vent under the wing.

keep repeating this process until 5-6 pushes of the hand pump go solid. this is when you know no air is in the system. at this point, you should be able to select the relief and hear no air or gurggling, the level should stay correct, and no fluid vent out.

Repeat the process for the Red system and the yellow system. (all the fluid comes from the same resevoir. i think, will check tommorow.).

you should end up with a completely air free system.

once done put the rig on and select CLOSED circuit, not open. engage the rig and allow the fluid to circulate around the system for 2-3 minutes (no longer or it will start getting too hot, the rig is not as good at cooling as the aircraft heat exchangers), any trapped air will bleed out through the Mk4 rig's resevoir, its self bleeding.

once done, select wing fold, after a few tries it should start to go up with any luck. after a few cycles the air from the stubborn wing should bleed out through the rigs resevoir.

After a week, check all your N02 levels and res level again


phew!! sounds difficult, but it doesnt take too long. got a risbridger hand rig for topping up have youhuh? you will need it.

try see how you get on wink
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xx Re: Sea Vixen FAW.2 XJ494 - Progress
« Reply #217 on: Apr 7th, 2009, 12:00pm »

matt, update on that procedure I gave you. a couple of points to correct. from the hand pump bay, you can only prime and bleed the yellow, blue and green. not red. you dont need red anyway really. All the systems are primed from the green master resevoir in the s/b gear bay, via non return valves. hence as long as the green res level is correct after the priming procedure, you should be ok.

enjoy


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xx Re: Sea Vixen FAW.2 XJ494 - Progress
« Reply #218 on: Apr 19th, 2009, 10:49am »

mat, you dont have any serviceable spare wing fuel caps in your stash do you? our have had it now, beyond saving. If not i'll get on to Pk see if they have any.

ta

how you getting on with the wing fold issue?

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xx Re: Sea Vixen FAW.2 XJ494 - Progress
« Reply #219 on: Apr 19th, 2009, 5:35pm »

I'll ask dave about wing fuel tanks, send us a photo about what your on about as i'm not sure where they are, the ones shown in the book don't appear to be serviceable on ours as i can't get in

the engine is pretty much in just the throttle linkage and the generator to finish wiring up , we dry cycled the port twice for the hell of it, got told off for being late home as for the hyd's didn't get time those pipes that join the engine to the airframe and there respective clamp are a pain and have to be done in a certain order and orientation

I think the word hindsight was mentioned at least 5 times i'll try and get ffrancis to upload some images soon
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xx Re: Sea Vixen FAW.2 XJ494 - Progress
« Reply #220 on: Apr 19th, 2009, 8:10pm »

Some photos from Matt...

All piped up!
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Dave’s last pipe!
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Jet pipe in...
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I also took a short piece of video footage of one of the dry cycle runs which can be seen here:

http://s44.photobucket.com/albums/f39/plazzdaman/Sea%20Vixen/?action=view¤t=030.flv
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xx Re: Sea Vixen FAW.2 XJ494 - Progress
« Reply #221 on: Apr 26th, 2009, 4:37pm »

Just a few things to add after saturday, as recommended my milton at gatwick we attempted to top up all nitrogen levels, however we had a persistant leak from the gauge for the green system in the end i took it out of the system and bridged the gap it hold pressure now anyway after doing this we started with the priming of the system which as suspected is indeed full of lots of air

WE finished the generator wiring and also did a bit of fault finding on a non fuctioning ignitor RED = 28V BLACK = EARTH note to chris

we are pleased to report that all ignitors now fuction correctly, and all we need is an oil change and top up on the 'new' engine and then well we'll see

hopefully this year will see both engines started and run, and then we have to sort the brake issue otherwise we won't be going anywhere

oh and yeah there's still a main wheel to cx/sort out
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xx Re: Sea Vixen FAW.2 XJ494 - Progress
« Reply #222 on: Apr 27th, 2009, 10:02am »

Nice one matt. good progress. common problem that gauge issue. we had that recently with the yellow system. there is a flat seal inside the gauge that goes rock hard.our next job is brakes too, they dont work so well! heres a recent shot of the old heap due a paint job soon too!

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xx Re: Sea Vixen FAW.2 XJ494 - Progress
« Reply #223 on: Apr 27th, 2009, 1:28pm »

Great job on the dry run Matt! Can't wait to see video of her coming to life again!! cheesy
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xx Re: Sea Vixen FAW.2 XJ494 - Progress
« Reply #224 on: May 4th, 2009, 09:24am »

Well eventful day at brunty again

started in the morning to find DT on his back investigating a mysterious fuel leak from a system i've not even looked at yet (it only has fuel in it when the engines have been run) yes indeed dave had roped some people into helping him fire up the undisturbed engine, although mainly a success there is apparently an oil leak to cure somewhere however that will require running with the engine covers off that side (not today then) to identify the source. Let's get back to the other one a proposed to dave....

THe invertor issues have made some progress with one of the looms found to have overheated and arc'd replacement ensued and is still underway lack of a fully charged battery or a "quiet " power set prevented testing

oh yeah the stbd wing went up then down and then she bled again all over the floor , then dave told me the hydraulic lock was stuck on the port wing, at least the proceedure milton gave me sort of works

anyway we struggle on, was slightly diverted by events on the "flight" line at brunty though but that's another story.....
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