Instrument Approaches and procedure turns....

Greg Esres wrote:

This was my point before. NALLS is not a DME fix. It's not
charted as one either.

It's still charted incorrectly. You can identify the fix using the
radial AND DME, but not the localizer and DME off of SNS.


Part of the confusion here is that NALLS is *both* an IAF and FAF.

While on either transition, NALLS is defined as a *IAF* by the RADIAL and DME
(or radar). You can't use the LOC in lieu of DME for this purpose, due to the
possibility of encountering a false lobe.

When established inbound, NALLS is defined as the *FAF* by the LOC and the
RADIAL. You can't use DME in lieu of the radial for this purpose, due to the
geometry (as was pointed out in a previous post.)

Part of the confusion here is that NALLS is *both* an IAF and FAF.

Irrelevant. The fix definition doesn't change by how you're using it.

You can't use the LOC in lieu of DME for this purpose, due to the
possibility of encountering a false lobe.

This was speculation. Nothing on the approach says that this is true.
I spoke with someone with Flight Procedures today about another
approach, and mentioned the possibility of "false lobes" on a
transition. He indicated that a transition is flight checked for
false lobes and if found, would not be approved. I'm sure there are
exceptions. He mentioned some procedures at Grand Junction that
contain lots of warnings about the possibility.