If there's an IAF at AIRLI, why is Radar required to get on this approach?
Funny because It would be less ink to add it to the en route chart than print RADAR REQUIRED on this chart.
In particular, to implement the multi-channel FMCW radar required
to support angle estimation, the total computational complexity increases significantly.
That means the only way to the final approach course is via radar vectors and you can expect a big RADAR REQUIRED
note in the plan view.
Consider the LOC Rwy 6 to Shreveport, LA (KSHV) and the note "RADAR REQUIRED
." Requirements stated in the plan view and not the approach title mean the requirement is for something other than the final approach segment.
With the "RADAR REQUIRED
" statement, you know these are identifiable by radar if you don't have any other way to identify them (DME, GPS).
(3)(b) addresses these notes saying, "When radar or other equipment is required for procedure entry from the en route environment, a note will be charted in the plan view of the approach procedure chart (e.g., RADAR REQUIRED
or ADF REQUIRED).
In the June 2014 quiz, question 5 asks, 'What does an IAF or lack of an IAF on an approach chart tell you?" One of your answers is, "If there is no IAF then it's a vector-only-approach with radar required
Why is radar required
for the IAF at Lawrence (LWM)?
TERPS guidance (FAA Order 8260.19 paragraph 855(g)(2) for those of you following along at home) says, "Where radar is the only method for procedure entry from the en route environment, enter the following: "Chart planview note: RADAR REQUIRED
(2) Where other navigation equipment is required to complete the approach, e.g., VOR, ILS, or other non-ADF approaches requiring ADF or DME for the missed approach, use: 'Chart note: ADF required,' or 'Chart note: DME required.' When radar vectoring is also available, use: 'Chart note: ADF or Radar required
. Although BJC is an IAF, there are no feeder fixes nor provisions for course reversal.