Bombs more accurate in NAV than in IFA

[LastRifleRound]

AUTO mode is far more accurate in NAV than IFA on the INS switch. IFA mode will always overshoot target. To test, cold start a jet. Put the INS in IFA. Pick a smaller target that can be POINT tracked with a TPOD. POINT track the target, laser range it. Drop in AUTO at 5000ft.

 

Repeat the same process, but instead put the INS in NAV instead. You'll find the bomb dispersion in AUTO is the same (which is to be expected in a level delivery) but in NAV the pattern of dispersion is centered around the target, whereas in IFA the dispersion is around some position way beyond the target. ( I use BRDM80's for my testing). Also, IFA causes a CAUTION on startup (when switching from GROUND ALIGN) whereas NAV doesn't.

 

For now, I recommend moving the knob to NAV, even though it should be IFA.

 

EDIT: Be advised this is only an issue on a cold start. On a hot start the jet will be in IFA but there will not be an issue.

Edited March 30, 2020 by LastRifleRound