Stoner99 Posted December 6, 2022 Share Posted December 6, 2022 I work on the KC130J super herc. We are having tcas issues in flight. We swapped both antennas and processor. Checks fine on ground but in flight around 10000 feet and above, we get a tcas fail acaws and no longer get TA or RA advisories. Please help Quote Link to comment Share on other sites More sharing options...
Jcapsparkchaser Posted December 8, 2022 Share Posted December 8, 2022 I Have Been Out Too Long To Remember any Quick Remedies, The Person To Contact Would Be To Contact Tiny Clark, Hopefully He Will See This. Quote Link to comment Share on other sites More sharing options...
n1dp Posted December 9, 2022 Share Posted December 9, 2022 Had to do some reading. TCAS gets it's altitude input from the transponder (IFF) which in turn gets it from the pilot's encoding altimeter. At least on older models. Because it is happening at 10K, I'm going to assume it may be a bad altitude input (or lack of one) instead of the TCAS system. Disclaimer: It's been a few years! Quote Link to comment Share on other sites More sharing options...
tinyclark Posted December 21, 2022 Share Posted December 21, 2022 While I appreciate the kind input of my helpfulness, it has been a while. Definitely do what n1dp said, check the altitude inputs. Antenna lines have cause very weird problems. They can be checked using a RFLTS. If the problem seems at exactly 10k feet, it really would be an altitude malfuntion. I need to look at some old books to see if there is a missing signal on one of the inputs that would cause this. Quote Link to comment Share on other sites More sharing options...
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