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Aero Precision provides OEM part support for military aircraft operators across more than 20 aircraft


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  1. Hi Tiny, What we basically do on the ground is have SCNS on and we turn on TACAN and ILS/VOR and just tune them to a local station. With A/P engaged, we select LNAV/NLOC on the mode select panel - as soon as we depress that button we get a annunciator light on the Flight Progress Warning Unit Panel that goes from N/L ARM and immediately to N/L CAP. We have checked several of our other aircraft on pilots and copilots sides - all perform correctly. The plane I'm talking about is the only one that will not go into capture when we perform the aforementioned steps on the copilots side. Aga
  2. Thank you Tiny. Over the years we have swapped out several parts and shot a lot of wiring with assistance from an engineer. It fails on the ground all the time no matter what we have done - copilots side with AP2 selected and NAV/LOV selected on the mode select panel always stays in N/L ARM - it never goes to capture. We used the IFR4000 and tested the glideslope, ILS and TACAN and all checks are good. We are in Great Falls, MT. We changed out the SCNS relay panel after swapping out a few NIRP relay's, just to rule out the panel after all else failed. As for stored faults - we don't see
  3. Thank you so much for your help TinyClark. We have not been able to find anything either regarding how this is supposed to work. Perhaps that is why the engineer could not answer our question. I will double check our troubleshooting diagrams that we used a long time ago, we may have already shot that wire, been a long time since we worked the issue. It's been sitting in the "K" write ups for almost 2 years. I too, am retiring the end of this year - and looking forward to it!! 38 years of service is LONG enough- ha ha!! Keep me posted if your contact has any further info. Thanks again,
  4. We have a 74 model H1 with AN/AWY-1 single system autopilot, (Air Force Standard Flight Director, C12 Compass, single INU) that has had a perplexing discrepancy for a few years. With the FDMS switches in SCNS, AP2 selected on the FCP and LNAV/NLOC selected on the mode select panel the write up reads as follows "AP2 will not capture beam with SCNS selected". During the ops check with switches in the aforementioned positions the "N/L ARM" display on both pilot and copilot FPWU annunciators remain on and they never go to "N/L CAP". When AP1 is selected and all switches as listed, they system w
  5. Thank you for your time and information. We did change out both displacement gyros last week as a most likely. Another repeat write up that I was just informed about was the #2 C12 compass system indicators start spinning uncontrollably 2 hours into flight. I was told by someone that magnetic objects near the #2 flux valve could cause this issue with both ADI's as signals go to the automatic flight control processor. We have C130H1 1974 models. The plane is currently at another location and landed with these repeat issues. We did not have a directional gyro for the c12 and changed out t
  6. We have an aircraft that has both pilot and copilots ADI's attitude spheres start showing 10 degrees of bank in straight and level flight approx. one hour into flight and getting progressively worse as flight continues. The FDMS has both sides in VG mode, pilot has VOR1 selected and copilot has SCNS selected. The airplane has the Air Force Standard Flight Director system, single INU, C12 Compass system and digital flight control system. We have swapped out both displacement gyros and system tests good on ground after running for 2 hours. This is a repeat write up after changing gyros. Wit
  7. Hi All, New to the C130 aircraft. Unit had fighters for years and now trying to gain helpful tips and info on guidance and control issues. Mainly AN/AWY-1 autopilot. We have older H1 models, single INU, C12 compass, standard flight director, etc. As we move through the conversion process and ops flies longer missions we have had several write ups on porpoise of aircraft with autopilot engaged on several aircraft. Being new to the airframe, limited training AND using the FI - we are extremely frustrated with the uselessness of the FI. The FI does not seem to address actual flight control
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