Danoo Posted September 22, 2024 Share Posted September 22, 2024 Hello friends, while flying on INS LTN-92 (which updates its position through GPS) after 15 minutes of flight, aircraft ANP exceeds limit of RNP in cruise. What may be the probable causes??? Why system generates so much drift in just 15 minutes?? Quote Link to comment Share on other sites More sharing options...
tinyclark Posted September 26, 2024 Share Posted September 26, 2024 While I was Avionics on 130s for years, I have never heard the terms ANP and RNP. Has any work been done around the mount? 1 Quote Link to comment Share on other sites More sharing options...
Danoo Posted September 27, 2024 Author Share Posted September 27, 2024 ANP (Actual Navigation Performance) & RNP (Required Navigation Performance) terms are related to Flight Management System which ensures you are flying in authorized corridor. When INS is providing navigation data to FMS it gets out of limit after 15 minutes of flight. Quote Link to comment Share on other sites More sharing options...
tinyclark Posted October 1, 2024 Share Posted October 1, 2024 Got it. Can you choose independent INS or GPS to feed the FMS, or does the FMS take both inputs and create a solution? What model is this aircraft, and does it have dual INU? 1 Quote Link to comment Share on other sites More sharing options...
tinyclark Posted October 22, 2024 Share Posted October 22, 2024 Just wondering if you figured this out yet? 1 Quote Link to comment Share on other sites More sharing options...
Danoo Posted October 23, 2024 Author Share Posted October 23, 2024 Thanks tinyclark, issue has been resolved by updating MCDU software itself. Quote Link to comment Share on other sites More sharing options...
tinyclark Posted October 23, 2024 Share Posted October 23, 2024 Wow, that's great. Quote Link to comment Share on other sites More sharing options...
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