PPRuNe Forums - View Single Post - Boeing (744/8) Localizer "sensing"
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Old 14th Jun 2021, 16:54
  #5 (permalink)  
speed freek
 
Join Date: Sep 2002
Location: 8000 feet of cabin altitude
Posts: 535
Notice it says "APP" mode, not "LOC" mode, although logically the implications would be the same for the LOC mode.
I would argue the reason there’s a difference is if LOC captures the wrong localiser, you can engage another roll mode and recover.

If using APP and it locks onto the wrong ILS, you’d have to select TOGA or turn off the A/P and F/Ds and then rebuild, all while turning the wrong way, possibly towards hills. Bit messy.

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