IF you have a certified IFR GPS that can act as your DME source, can you fly a vor/dme or loc/dme approach?

Yes, see this link: http://www.aopa.org/whatsnew/air_traffi ... _lieu.html

MTV

The short answer is "NO". The approach name at the upper right indicates the required nav equipment. If the remarks indicate highr minimums for DME Inop you can.

Yes, you can use a WAAS enabled GPS with a current data base as a substitute for DME.

WAAS is not required. From the website, and according to FAA guidance, that's been around for quite a while: •The required integrity for these operations must be provided by at least en-route receiver autonomous integrity monitoring (RAIM), or an equivalent method. Although currently not available, Wide Area Augmentation System (WAAS) receivers will also be eligible for the substitution.

This guidance came out before WAAS was available. If you have a WAAS enabled receiver, you're good. If not, enroute RAIM is good enough.

MTV

My 300xl is glad to hear that.

lov2fly wrote:The short answer is "NO". The approach name at the upper right indicates the required nav equipment. If the remarks indicate highr minimums for DME Inop you can.

Yes, you can use a WAAS enabled GPS with a current data base as a substitute for DME.

WAAS has nothing to do with it. Any IFR certified GPS can substitute for DME. For example I have an old Apollo GX-55, it's a slide in replacement for the even older Lorans. It is a terminal and enroute only, no approaches in my box. Perfectly legal to substitute for DME. Current database also not required, current data is.

The short answer is "YES" even if the VOR/DME/LOC equipment is inop...UNLESS you are landing at your alternate, in which case you will have to have all the old radio hardware... UNLESS you are flying a WAAS system certified for sole means of navigation.

Yellowbelly wrote:The short answer is "YES" even if the VOR/DME/LOC equipment is inop...UNLESS you are landing at your alternate, in which case you will have to have all the old radio hardware... UNLESS you are flying a WAAS system certified for sole means of navigation.

An approach is an approach. You may need certain equipment to make an alternate legal to file but once you actually decide to go fly an approach, whether it's at your filed alternate or somewhere else, then the non WAAS GPS is as legal there as it was at your initial planned destination.