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F-14 INS recalibration : TACAN fix and alignment reinitialisation


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Posted

Hi. A few questions : 

1) Is the aligment reinitialisation procedure in the manual correct ? It states :

 

  1. Set NAV MODE switch and WCS switch to OFF. Allow TID displays to collapse. Proceed with normal start sequence.

  2. Set NAV MODE switch to OFF. Set NAV MODE switch to desired align mode.

  3. Set NAV MODE switch to INS. Verify system in INS (IN acronym on TID). Cycle NAV MODE switch to OFF and back to desired alignment mode.

It seems weird to be forced to do Nav mode INS => OFF => CVA => INS => OFF => CVA => INS to finish the sequence...

2) I can't succeed in fixing alignment with TACAN. I set a waypoint on a beacon I receive, about 40 nm from me. When starting the fix, the printed error increases, instead of decreasing. I'm flying straight, with autopilot altitude on. What's wrong ? 

Posted (edited)

I didn't select TACAN station on TID. Will try. Thanks a lot for the reference !

Edited by Aigle2
Posted
17 hours ago, Aigle2 said:

Hi. A few questions : 

1) Is the aligment reinitialisation procedure in the manual correct ? It states :

 

  1. Set NAV MODE switch and WCS switch to OFF. Allow TID displays to collapse. Proceed with normal start sequence.

  2. Set NAV MODE switch to OFF. Set NAV MODE switch to desired align mode.

  3. Set NAV MODE switch to INS. Verify system in INS (IN acronym on TID). Cycle NAV MODE switch to OFF and back to desired alignment mode.

It seems weird to be forced to do Nav mode INS => OFF => CVA => INS => OFF => CVA => INS to finish the sequence...

2) I can't succeed in fixing alignment with TACAN. I set a waypoint on a beacon I receive, about 40 nm from me. When starting the fix, the printed error increases, instead of decreasing. I'm flying straight, with autopilot altitude on. What's wrong ? 

1) I've never heard of such a sequence. Can't you just put the mode switch to INS and it starts (re)aligning?
2) You need to select the Waypoint on the CAP or hook it on the TID.

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