DmitriKozlowsky Posted December 23, 2018 Posted December 23, 2018 How long can AV-8B INS hold alignment on ground with engine OFF and ext power ON ? In DCS? In real world? Here is alternate start up procedure. For ground alert. Battery ON Ground Crew: External Power ON MFCD ON Menu:EHSD:DATA:AC Input aircraft data and place INS in ALGN GND. After alignment place INS in NAV or IFA Switch from BATTERY TO ALERT and remain on External Power. The aircraft is now in ground alert, and can be in air in less then 30 seconds. I am curious how long can aircraft sit on ground in warmed up alert before INS needs to be shut down or re-aligned?
*Aquila* Posted December 23, 2018 Posted December 23, 2018 As long as the APU or GPU has fuel to burn.
DmitriKozlowsky Posted December 24, 2018 Author Posted December 24, 2018 APU is OFF. Alert start only uses electric power from EXT.
Yeti42 Posted January 9, 2019 Posted January 9, 2019 I've never worked on the Harrier but all other aircraft I've worked on, the INS will drift over time, it doesn't even have to be moving. The amount of drift is obviously dependent on the system and that kind of information is classified so I suspect it hasn't been modeled in this case... Windows 10 64 bit | Intel i5-9600k OC 5 Ghz | RTX 2080 |VENGEANCE® LPX 32GB DDR 4 OC 3200 Hotas Warthog | Logitech G Flight Rudder Pedals | Track IR 4
Frederf Posted January 9, 2019 Posted January 9, 2019 In IFA with GPS updating the INU should remain operational and of good quality position keeping indefinitely. With drift allowed into the system (NAV, not IFA) perhaps the INU faults when it drifts in assumed position differs from the actual position by tens or hundreds of miles. I know INU will fail to align if assumed and actual position are much different. Will INU ever have a problem if assumed and actual drift too far apart (problem more than just assumed being wrong)?
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