If you press TDC down (action position) you are telling the aircraft:"I want to attack this" Since the aircraft gets its most accurate targeting information from the DMT, it will try to switch to it. If the TGP is on the right MFD, DMT will supersede it.
How to avoid this?
- Don't press TDC down (action) is not needed to target with TGP
or
- Have TGP on Left MFD
or
- Do not press TDC down (action) withing DMT Field Of View (FOV, i.e. Target 90° offset from the nose)
The way I do it:
- Aircraft on A/G mode
- Find target with TGP in HMS mode. Just have the target at the center of the TGP screen (crosshair) no need to press TDC down (action)
- IRMV Rdy
- Switch TGP to TDC
- maneuver aircraft so target is in HUD FOV
- Uncage IRMV
- Select IRMV as your main sensor
- Change FOV zoom in IRMV page if needed
- Press TDC down (action position), if target have high enough contrast IRMV will lock to it (crosshair collapse on target). If IRMV does not lock, continue to fly towards the target ( no need to dive, just stay withing IRMV FOV )
- Once IRMV locks, press and hold weapons release until missile fires.