tinyclark

On 6/21/2021 at 2:10 AM, Bigfoot said:

I well remember my days up in the nose wheel well of C-130s on the frozen, wind blown flight line at Elmendorf replacing APN-59 RTs and antennae alone, freezing to death and breaking my back without any help. That system was at least half our workload there which included ALL avionics systems, as we were severely undermanned and expected to fix it ALL right after we transitioned from AAC to MAC. As they told me right after I got there from Moody AFB in December 1979, “You’re no longer a comm/nav troop. You’re an avionics troop”.

Been there, done that way too many times. 

On 3/31/2009 at 2:29 PM, GaryRobinson said:

Tiny,

Did you ever get the s*** knocked out of you trying to adjust the centering on one of the IP-268 scopes. I did, three times in a row setting at Cam Rahn Bay. I was cpvered with sweat and told the shop chief I quit for the day my hands were shaking so bad.

 

Gary Robinson

I know this is old and you may not see it, but yes. I started wrapping F4 tape around my scribe, should have worn a leather glove to hold the scope.

Anderson pretty much covered everything. Therer are still ARN6 ADF systems on some H models as far as I know, but I've been retired for 10 years.

I probably repaired close to a thousand RT-289s in my career. Early on after training on them, I started replacing the TR and ATR tubes on every one, as well as the PFN if it looked the slightest bit swelled. Our MTBF went up quite a bit.

Is there a two way bubble level indicator on the antenna? Our APS-133 had one. Insure that the antenna is level on the ground with stab on and off.

Is the antenna following the tilt knob? What system is it?

What system are you referring to?

Do I count down from 45?

You can't TDR antenna lines for this system because of the reciever sensitivity of the RT unit. It is over -140db if memory serves correctly. You can rebuild the connectors,  build new cables or swap with another aircraft to see if it fixes the problem. A majority of these kinds of problems are the cables/connectors. Not sure where your R/T is located, or how long the cables are. I built a set of cables just for troubleshooting for several of the different platforms I worked. Also, are there any in line connectors in your aircraft? 

Do you guys still have NATEC civilians?

Tiny

I have no idea without a callout in the IPB.

There are way too many LAC processes to remember that much. Also, some wiring was replaced by newer designs. The 1-!A-14 has the story on aircraft wiring.

You will have to contact Lockheed. I used to have access to those LAC processes when I was working.

Not a pneumatics guy, but it looks like an expansion joint like the type used in plumbing. Doesn't the parts index indentify it?

Try swapping the TCAS processor with another aircraft. It is always goo to know you have a working unit, same with the antenna, swap with a good aircraft.

I would think anyenna or one of the cables. Are you sure all cables are connected properly?

Munir, since it makes no difference which phase is monitored, any phase could be used. I have no idea why they chose phase C. Maybe the relay was closer to a phase C connection. The only person that probably knows is the engineer who designed it back in the 1950's.

Sometimes, I think you think too much about these details. 😅

Sorry, I have no idea.

Again, I have never heard of a DCU. What system is it?

I have never heard of anything called that, Munir.

There are 9 of them. all #3 in the pic. Location: OW sta 185 and 293, and Ail Sta 103.5 on the wings, FUS STA 671, 701, 731.

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Munir,

For valve #40P107? Cage code is 82829

Contact Allen Aircraft Products, phone # 330-296-9621

Don't know why the #1 system pressure would affect #2. The worst thing the USAF did was put two 99.9% error free systems on the same bird. Woud have been so much better without the second system. The RF interlock system is ridiculously designed. I don't see that causing your problem. Wish I could be of more help.

Make sure the antenna cables are connected correctly. There is a possibility that two are swapped.

Not familiar with that RADAR. Given all you have changed, try changing the waveguide between the R/T and the antenna.Corrosion may cause false targets.

I couldn't find an old TCTO that made the system inoperational. This note was in the old 130B-2-4. There is also no mention of C-130B or E having it in TO 1C-130H-2-70GS-00-1.