wrote:

Anyone have a reference for a requirement to identify an ils or vor
prior to it's use in the USA?
Secondly, is there any reference to the type of identification
required? For example, would checking that the primary flight display
is displaying the correct identifier suffice? Or is there a
stipulation for morse code audible type of identification?

Stan


I don't think it is required by a regulation, but it is good practice to
do so. I can think of one place where you can get two different ILS's
on the same frequency: Just east of Wilkes Barre, PA at ~6000' while
tuning into the Williamsport ILS27 (110.1 if memory serves), you pick up
another ILS, which I think may be Stewart on the same frequency. No way
to know which one you are receiving if you don't decode the Morse code.
While this is outside the published service volume, if you are
receiving the Williamsport ILS and tell ATC you've got it, they'll let
you track that inbound rather than going to the Williamsport VOR then
doglegging back to get to the IAF.

Another example is it lets you catch faulty equipment. Last fall, my #2
NAV developed an intermittent problem where the synthesizer was
generating the wrong local oscillator frequency and tuning to another
VOR in the area. Again, listening to the Morse code flagged the problem
right away even though the VOR was showing a valid signal and there was
a morse code....it was the wrong one.