Approach Question

[DC8 Flyer]

Does anyone know why the ADF, DME or RADAR requirements are there? You can identify the appropriate intersections with cross-radials from the VOR and the miss is right at the VOR, so I'd think if you could shoot the approach (have an OBS), you could fly the approach without too much trouble. I do realize that KHUBS is a DME fix too and can also be identified on RADAR plus using the bearing to the LOM station, but...I can't see why you would need the ADF, DME, or RADAR...maybe I'm missing something easy.

-mini

Most likely, again only an noneducated guess, is that KHUBs is both a radar and dme fix, so imagine all hell breaking loose and both the DME on the LOC is OTS and the radar boys are on a union mandated break, then the only way to ID KHUBs is with an ADF bearing, since your #1 nav will be tuned to the LOC.

I know, I know your saying what if I have 2 VOR receivers, thats fine but you are only REQUIRED to have one so the FAA built the approach giving those with limited cockpit equipement the ability to do the approach in the event of above said disaster. So, if you have two VORs and no ADF, the DME is borked and Radar is out to lunch, technically you cannot do the approach.

Again, been so long since I have taught this stuff I could be totally wrong.

 

[minitour]

Doh! I can't even slam somebody correctly.

it happens

 

[great cornholio]

I'm going to exhibit some lack of knowledge about the industry. Do they really give you scenarios like:

"Here's an approach plate. Someone beamed you and you airplane over to this spot and the =only= chart you have available is the approach plate. The only thing you know is that you are over the VOR, but you have no idea how you got there. ATC says 'cleared for the approach' with no other instructions. Sorry, no situational awareness allowed!"

Yup thats how it was done. Messed up huh?

 

[midlifeflyer]

Yup thats how it was done. Messed up huh?

Ever find out what =they= wanted for an answer?

 

[nosehair]

Does anyone know why the ADF, DME or RADAR requirements are there? You can identify the appropriate intersections with cross-radials from the VOR and the miss is right at the VOR, so I'd think if you could shoot the approach (have an OBS), you could fly the approach without too much trouble. I do realize that KHUBS is a DME fix too and can also be identified on RADAR plus using the bearing to the LOM station, but...I can't see why you would need the ADF, DME, or RADAR...maybe I'm missing something easy.

-mini

To avoid cross-tuning on the ILS final at the IAF. You can ID the IAF with an ADF bearing or ILS-DME (7). Practicaly speaking, you could cross-tune your single vhf-nav reciever from LOC to VOR and ID this IAF, but for approach plate approval, a second nav radio signal (or radar) must meet that requirement. It's for the wussies

 

[great cornholio]

Ever find out what =they= wanted for an answer?

Nope but if it helps my buddy said that he could shoot the approach by flying the radial then enter a hold in lieu of a PT. The intereview guy didnt say much just that he would do the samething (maybe to see if my buddy would change his mind) anyways a few days later my buddy got the thanks but no thanks letter in the mail. So who knows what answer they want.