On Thu, 22 Jan 2004 09:29:01 -0500, "Barry" wrote:

When doing an ILS approach, with the glideslope, is it a requirement to be
able to identify the outer marker or a substitute? FAR 91.175(k) lists the
outer marker as one of the "basic ground components" and gives the acceptable
substitutes, but doesn't explicitly say that it's required. The AIM 1-1-9(j)
on "Inoperative Components" mentions the localizer and glideslope, but says
nothing about the outer marker.

If you answer, please give a specific FAA reference that says whether or not
the OM or a substitute is required.


Identification of the OM is not required but why do you think there will be
a specific reference to say that something is NOT required?

It's a good idea to check the OM, **if there is one**, in order to confirm
your GS altitude at that point, but there is no legal requirement.

You may also note that there is no "penalty" if an OM is not functioning.
Ron (EPM) (N5843Q, Mooney M20E) (CP, ASEL, ASES, IA)