Diesel, best of luck on that relay. Perhaps my old ears are playing tricks on me, but when you testing the second T/R I definitely heard fan noise. When you tested the first one I did not hear any fan noise. Did you notice the fan spinning on the first one. Just a wild thought that I had to share. Cheers!
Yes, the fan on the second T/R is larger and more audible than the fan on the first one. I could hear the fan on both but is hard to hear them over the noise of the NC8.
Working on parts that you can't see certainly reminds me of my days working on Skyhawks! No fun at all. On relays (and any mechanical switch), the pitting of the contacts generally occurs when opening the switch and having to stop the current. There is usually enough inductance in the system to keep the current flowing, and it can generate high voltages in an effort to keep that current flowing. There are ways to minimize the voltage across the contacts and reduce damage to the contacts, but to properly test and certify a change is beyond your level of maintenance, of course. As a former Skyhawk guy, thanks for the treat of seeing a T-bird! Definitely a rare sighting.
Happy digging to get to that relay. I'm sure the older guys are delighted to have you do it since you're a wee bit more limber and they've done put in their time digging stuff out of tight little holes. As always, thanks for sharing.
Diesel. Great video. Aweosme to see the TR'S are ops checking good. Looks like the engineers put that relay in a typical F-4 spot. Something I learned when working in the hell hole on a AFT canopy actuator. What ever tool your working with. You tie a piece of string around it and the other end around your wrist. That way if drop you just pull it back up to you instead of wasting time looking for a dropped tool. We would always use a combination wrench and tie the string through the box end. Good luck! And thank you for the video.
Not an electrical guy..... Is the 150 watt load a representative test for the TR? I gather this is a functional test, not a load test. Is there another way to check the relay? Can it be isolated from the circuit and remotely checked for function and condition without removal?
Good questions! The taxi light draws around 5 amps of power, so would be a light load (pun intended) on the T/R. These can support 100 amps each. Putting some sort of load on it and observibg the behavior gives good insight to it’s operation. I’ve seen power supplies that can test good in open circuit (unloaded conditions), but fall on it’s face once loaded. So the light helped out in that regard. We’re tracing out the path for the relay so we can test it remotely. I can reach in with the meter leads, so once we figure that out, will only have to remove if it’s bad.
No, it certainly won't be. We may be a able to isolate a connector and feed it power in place to see if it closes, and also the contact resistance on the main leads.
@@DieselThunderAviation Sounds like a plan. I was going to suggest, seeing it's position, it might be easier to access the relay's location through the cockpit, that is if there's no pressure bulkhead between the second seat and the area under panel 119. But I'm not familliar with that area of the Phantom.
I'd have a question: How is the "backwards compatibility" with the F-4? Does the new stuff fit with the Phantom like a glove or extensive modifications are needed for new components?
I guess it depends. There’s been a new navigation system installed in the jet for some years, an Aspen GPS and VHF radio that required the main instrument panel to be modified. There’s still replacement parts to be found. Doesn’t seem like we’ve had to modify much.
Was that Charlie looking around? He needs to hook the ICS back to the Lt WW where it belongs. When is "crewchief" Al going to put the Rt strut back together? It has only been sitting in pieces for 3 months. Waiting for parts is a poor excuse.
Diesel, best of luck on that relay. Perhaps my old ears are playing tricks on me, but when you testing the second T/R I definitely heard fan noise. When you tested the first one I did not hear any fan noise. Did you notice the fan spinning on the first one. Just a wild thought that I had to share. Cheers!
Yes, the fan on the second T/R is larger and more audible than the fan on the first one. I could hear the fan on both but is hard to hear them over the noise of the NC8.
great vid
Thank you!
Working on parts that you can't see certainly reminds me of my days working on Skyhawks! No fun at all. On relays (and any mechanical switch), the pitting of the contacts generally occurs when opening the switch and having to stop the current. There is usually enough inductance in the system to keep the current flowing, and it can generate high voltages in an effort to keep that current flowing. There are ways to minimize the voltage across the contacts and reduce damage to the contacts, but to properly test and certify a change is beyond your level of maintenance, of course. As a former Skyhawk guy, thanks for the treat of seeing a T-bird! Definitely a rare sighting.
Removing the fasteners holding that relay by the braille method, has gonna be fun.
Happy digging to get to that relay. I'm sure the older guys are delighted to have you do it since you're a wee bit more limber and they've done put in their time digging stuff out of tight little holes. As always, thanks for sharing.
Diesel. Great video. Aweosme to see the TR'S are ops checking good. Looks like the engineers put that relay in a typical F-4 spot. Something I learned when working in the hell hole on a AFT canopy actuator. What ever tool your working with. You tie a piece of string around it and the other end around your wrist. That way if drop you just pull it back up to you instead of wasting time looking for a dropped tool. We would always use a combination wrench and tie the string through the box end. Good luck! And thank you for the video.
I have a feeling that Heatblur is waiting for this Phantom to be done before they release the module to DCS 😂
I want win a tshirt !!!! Pick me !!!!😊😊. F4 module would be nice too !!!!!!
That'll be a fun giveaway for sure. Not sure when I'll run that one, but I will be sure to let everyone know like with this one!
Just a good vibes channel.
Thanks for the great videos.
Glad your enjoying them!
Not an electrical guy.....
Is the 150 watt load a representative test for the TR? I gather this is a functional test, not a load test.
Is there another way to check the relay? Can it be isolated from the circuit and remotely checked for function and condition without removal?
Good questions! The taxi light draws around 5 amps of power, so would be a light load (pun intended) on the T/R. These can support 100 amps each. Putting some sort of load on it and observibg the behavior gives good insight to it’s operation. I’ve seen power supplies that can test good in open circuit (unloaded conditions), but fall on it’s face once loaded. So the light helped out in that regard.
We’re tracing out the path for the relay so we can test it remotely. I can reach in with the meter leads, so once we figure that out, will only have to remove if it’s bad.
Getting at that relay is not going to be a quick easy job.
No, it certainly won't be. We may be a able to isolate a connector and feed it power in place to see if it closes, and also the contact resistance on the main leads.
@@DieselThunderAviation Sounds like a plan.
I was going to suggest, seeing it's position, it might be easier to access the relay's location through the cockpit, that is if there's no pressure bulkhead between the second seat and the area under panel 119. But I'm not familliar with that area of the Phantom.
I'd have a question: How is the "backwards compatibility" with the F-4? Does the new stuff fit with the Phantom like a glove or extensive modifications are needed for new components?
I guess it depends. There’s been a new navigation system installed in the jet for some years, an Aspen GPS and VHF radio that required the main instrument panel to be modified. There’s still replacement parts to be found. Doesn’t seem like we’ve had to modify much.
Was that Charlie looking around? He needs to hook the ICS back to the Lt WW where it belongs. When is "crewchief" Al going to put the Rt strut back together? It has only been sitting in pieces for 3 months. Waiting for parts is a poor excuse.
How can you reassemble something if you don’t have parts or are waiting for custom stuff to arrive?
If you don't have the parts you think you're going to need don't take it apart until you do.@@MomedicsChannel