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Lkuest last won the day on January 16 2020

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  • core_pfield_11
    Went to LRAFB in November 2002 working as an engine specialist on the flightline at the 314 AMXS/Blue AMU. In May 2011, started working as an FTD instructor at Yokota AFB, Japan. Arrived back at 314 AMXS/Blue in 2014.
  • core_pfield_12
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    C-130H Propulsion

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  1. NATOPS essentially already answered this question above. The analog indicator is allowed to be 2% low and still be considered safe for flight. There is a different RPM limitation for a digital indicator. If the RPM actually dropped below 94%, the bigger problem would be high TIT, low torque, and likely flameout. If you are reading 92.5 but the temperature and torque nearly match the other engines, the RPM is above the Speed Sensitive Valve transition of 94%.
  2. I seem to remember going over 100 deg C just resulted in pulling the mag plugs, and going over 150 is an oil change. Pulling the mag plugs is to check for damage, then put them back in. My guess is 100 deg C is the limit because that's the point when damage becomes much more likely. If I had to guess why this causes an engine shutdown event, I'd say only a malfunction could allow the oil temp to go above 100 while flying due to the robust amount of cooling air available. If the engine is shut down for oil temps, it is a good idea to get the engine restarted for landing for maximum controllability and go-around margin. As for a reference, my guess is whatever tech data the owner provides. For the US military, that would be the 1C-130H-2-70FI-00-1-2.
  3. Gimme the BPO work cards and 1 hour, and I'll throw down three "red-x's" and 20 "/'s"
  4. Only thing I would add to pjvr99's response is consider resealing the low pitch stop too. I'd almost bet money the squeal check would fail.
  5. Here's the source website for service news bulletins. https://www.lockheedmartin.com/en-us/who-we-are/business-areas/aeronautics/sustainment/customer-support-center/service-news-magazine-archive.html
  6. If the orifice cups are clogged, you will never be able to accurately check servicing, as the pressurized sump may always show good, but at the expense of the atmospheric sump. The atmospheric sump is allegedly the most accurate location, so if it's inaccurate, it will always lie to you. You should check your tech data for how to clean the orifice cups. The only other option is to replace the pitchlock regulator, preferably with one that was recently overhauled to guarantee the cups are clean. One indication the orifice cups are clogged is that, when you check the pressurized sump after 2 minutes, the fluid fills up and overflows. This is due to the pitchlock regulator keeping the fluid pressurized in the system instead of draining the fluid into the barrel like it's supposed to. Be careful of those who tell you only the pressurized sump is required for an accurate fluid check. This comes from the idea that the pressurized sump dipstick actually gives you a quantity, and the atmospheric sump is only a go/no-go. The only thing the pressurized sump dipstick tells you is how much fluid is in the pressurized sump, who's job is to force-feed the pumps sending the fluid out to the valvehousing. The atmospheric sump dipstick tells you how much is in the barrel AND atmospheric sump. If there's nothing on the atmospheric dipstick, you have no idea how much is in the barrel, and that can be dangerous.
  7. It is likely your orifice cups are clogged, preventing proper filling of the barrel assembly, and therefore your atmospheric sump
  8. This sounds strange. I'd almost suspect you had a bleed valve stuck open on one of the other engines, or there may be a wiring problem within the anti-ice system that is affecting indication. Does the engine pitch sound like it's roaring to life? Does the aircraft actually yaw a bit in the direction of the increased torque indication? I would also be interested to hear how all 4 engines behave together when all bleeds are open and the wing & empennage are actuated. Please, for clarity, when you say TIT remains the same, can you please specify whether the TIT momentarily moved up/down and corrected, or did the TIT simply not move? Can you verify the wing and empennage valves have proper function. Please clarify how much each indicator is moving when wing and empennage anti-icing is actuated Really, the only reason for torque to significantly increase with a steady TIT is the engine suddenly becomes more efficient by retaining more air within the engine, or the indication is lying.
  9. does this happen with only that single engine bleed air valve open, or are all 4 engine bleed air valves open? Do you have dummy bleed air valves, or bleed air regulator valves?
  10. I recommend checking the NTS gaps, Low Pitch Stop blade angles, and Torque Retaining Lugs for all 4 propellers, as well as note the results of the in-flight NTS checks.
  11. I agree with NATOPS, once the engine shuts down, any fluid pressure from the still-spinning pumps will go directly to the increase-pitch side of the dome via the feather valve and feather actuating valve until the pumps can no longer supply 100 PSI. Then the blades stop changing pitch. Since the internal seals for each propeller are worn differently, it's difficult to nail down a specific degree when you transition through that pressure. Also, as you are flying, airflow is still trying to spin the propeller beyond what it would be during a ground run. I doubt you will get all the way to feather, but you should get far enough to make sure propeller drag isn't dangerous. Think of the propeller as an air brake which either absorbs or transmits airflow energy. If the airflow is inadequate to continue spinning the propeller, then the propeller resistance to airflow is naturally going to be low. I am unfamiliar with the flight manuals, so purely from a maintenance standpoint I also want to emphasize that you will still have 28vdc attempting to actuate the propeller feather solenoid, so once the blades stop changing pitch, the propeller feathering circuit may still be energized, both overheating the circuit as well as sucking DC voltage if that bus is powered. Check your flight manual to see if you need to manually pull the feather override button up if the propeller blades stop changing pitch, but are not all the way in feather.
  12. I recommend your military request technical data upgrades. I've never even seen a 1C-130B-2-4, so I have no idea what information I could add to help you troubleshoot your problem. With updated technical data, you might be able to do this on your own. As with most fluctuations, it is much easier to recommend a maintenance action if I was able to see all the engine instruments. Just about anything can cause a torque flux, and "all wiring" is a pretty broad statement.
  13. I would be interested to know what kind of troubleshooting manuals you have available to you.
  14. I agree with pjvr. What you are describing is a throttle misalignment below crossover, for which there is no limit. If everything else is within limits, there isn't a problem. If you are still really concerned about this, you could check for air leaks, but you should also have lower torque and slower starts. You could also adjust the TD Valve and/or Fuel Control, but ONLY if the rich/lean check shows rich AND you have warm start temperatures and well within normal start times. Otherwise, it sounds like the TD system is doing its job well, and stops controlling when it's supposed to stop controlling.
  15. If TIT, Fuel Flow, and Torque are all low together with no change in RPM, whatever is causing the problem is definitely fuel related. Have you run an electrical check on all wiring? Some of the electricity goes through the LH engine wiring harness, and there is a J3 lead that can cause problems. You might also hook up the TD Amp test set and shake the wiring around to try to duplicate. You should also pull the lid off the junction box next to the TD Amp and see if anything looks out of place.
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