I think I'm missing something, maybe someone can help. Refer to the following link [204.108.4.16] for the current ILS approach plate for runway 2 at Sacramento Executive airport. You will note that it says "ADF Required" in the upper left corner of the map area, yet, there doesn't seem to be reference to an NDB anywhere on the procedure.
Surely they don't mean "Automatic Direction Finder." Is this a typo, or do they mean something else?
Take a look again. The VOR and the LOM are not colocated. Therefore, the only way to identify the LOM is by A) IFR GPS or B) The ADF.
The ADF is required for the Missed Approach procedure as well as one of the alternate ways to identify the FAF on the LOC approach.
However, if you do not have ADF or IFR GPS you can still fly this approach by telling Norcal Approach that you don't have the capability to fly the missed and you need an alternate, ATC-directed Missed Approach procedure.
Randy, are you referring to a DME? I'm not sure how you locate the LOM using an ADF, unless you have an NDB someplace tangential to to the Vortac/LOM. If so, it certainly isn't on the procedure. (I've always used the marker beacon signal to locate the LOM anyway.)
I'm thinking someone meant "DME" but typed in "ADF" possibly? It's certainly an odd requirement for an ILS or localizer approach since few people still have them on their airplanes.
Sac,
By definition, a LOM is a NDB colocated with the outer marker (OM) beacon. In this approach, you can spot the LOM using either a marker beacon receiver OR an ADF. The problem is that the hold is also at the LOM and although you could know you are going over the LOM using a marker beacon receiver, you can't fly a holding pattern using a marker beacon receiver.
Michael gave you a very good answer. I personally did not know that you could use the approach without an ADF by asking for an alternate missed procedure. I expect that if you asked for one, they would just tell you to "hold Southwest of SAC on the 196 radial" since it covers the same protected airspace.
Wow. Thanks for the answers - I seriously did not know that. So if I understand correctly, the ADF is required as an alternate for a VOR nav receiver, but may be substituted by an IFR legal GPS. (I can't imagine holding with an ADF, I'm sure that's one of those lost arts.)
Well, I guess I sound like a bonehead, but I'm glad I asked.
Someone tell me how can you legally file to an airport when you don't have the required equipment to complete the approach/missed approach...in this case the ADF...talking about the ILS approach. They actually need to update that approach...the VOR approach plate shows a missed approach that does not require ADF..you just go direct to VOR....why can't they do the same for the ILS....anyway.....What if on the way to SAC, you lose Comm? so now you can't get alternate missed approach instructions and ceilings are below VOR approach mins. When the SLI VOR was out of service here at Fullerton airport, they could not legally give alternate missed approach instructions for the LOC approach because FAA had not issued one and they weren't allowed to do it on the fly...only GPS approaches were allowed. So if NorCal has FAA aprroved alternate missed approach instructions for the ILS into SAC...you are OK...don't know if they do or not.
If you loose comm and you don't have the equiptment to fly any of the approaches and you can't do a visual, then you go to your alternate. Being able to fly a published approach is NOT required. I have filed many IFR flight plans to a home airport that had no published approach. I was always expecting a 'visual approach'.
The other thing to remember is that the for this approach, the missed instructions say to fly to the LOM *OR* the VOR. Only the hold is based on the LOM. If you are not in radio contact and just did a miss, you don't have to wait and do any holds at all. You can elect to go from the LOM/VOR directly to another IAF for this airport or your alternate.
