CAP question

Captain X · Post by **Captain X** » Thu Mar 23, 2006 3:54 pm

Got a queston:

In the CAP using Buffalo Narrows Sk as a example...... the plate says "Altimeter setting avbl ltd hrs"

So you are doing the approach and u dont get one, whats the best thing to do? If there was an aircarft on the ground and gives u one could you use that?

Jeremy · Post by **Jeremy** » Thu Mar 23, 2006 4:06 pm

Good question. You've got a couple options:

Ask for the MEA/MOCA, if visual, Cx IFR and continue VFR.

Shoot an apporach at a nearby airport and then Cx IFR once visual and continue to distination.

Get a call-out after hours for the actual ALT. setting.

Use remote ALT setting if approved on the plate.

I don't believe getting the setting from an aircraft on the ground meets the requirements for and ALT setting. Although it could work quite well, how many times have you flow a machine with the ALT setting off a whole bunch? When you set the airport elevation, then compare it to the actual ALT setting, often it's out by a bit. Keeping in mind cold Wx corrections, and diff. in ALT setting from the a/c on the ground, if you did use ALT setting from the other aircraft, I would add a bunch of ALT to the MDA/DH to compensate for potential errors.

What about the rest of you?

kavupilot · Post by **kavupilot** » Thu Mar 23, 2006 11:18 pm

In some countries getting an altimeter settign off an aircraft on the ground is an acceptable means..not sure here

turbo-prop · Post by **turbo-prop** » Fri Mar 24, 2006 5:14 pm

It is legal to get an altimeter setting from another aircraft that is on the ground at the destination.

McPhoo · Post by **McPhoo** » Mon Mar 27, 2006 3:54 am

My vote goes with the theory that it is legal to use the one from the ground. But I would use a little extra alt for sure. Never have seen two altimeters agree in the same plane never mind two differant aircraft.

prop2jet · Post by **prop2jet** » Mon Mar 27, 2006 7:14 am

Getting an Alt setting from an aircraft on the ground is more a liabiltiy issue - if you had an accident and in the course of an investigation it comes out that you obtained your altimeter from an aircraft on the ground, it might cause you some problems.

I believe the only approved method is by way of a remote alt. setting if one is approved and available, or being able to conduct the approach in VMC.

turbo-prop · Post by **turbo-prop** » Mon Mar 27, 2006 11:16 am

Most remote places that give out an altimeter setting just use 2 altimeters and average them. So what would the difference be if the aircraft on the ground did the same thing. But that being said prop2jet is right there is a liability issue with giving out the altimeter setting if the aircraft crashed on approach.