Are marker beacons required?

[centralhome]

If you have a plane with dual Nav/Comms and no DME or IFR GPS and no ADF, are the marker beacons in the plane required to work to fly an ILS?

Thanks

[mooneyguy]

No, unless (obviously) it was dme/adf/etc required.
Outer marker maybe substituted with compasslocator, par, asr, dme, vor, or ndb

[Chewie von Nubbins]

Originally Posted by centralhome

If you have a plane with dual Nav/Comms and no DME or IFR GPS and no ADF, are the marker beacons in the plane required to work to fly an ILS?

Thanks

It really depends on the approach. In the majority of cases, if the ILS approach doesn't have marker beacons, there will be a NDB or compass locator in place of the IAF. If your plane doesn't have ADF equipment in it, you can substitute the ADF equipment for an IFR approved and current GPS unit. If you have neither ADF nor an IFR approved and current GPS unit and the ILS approach says ADF required, you are not legal to fly the ILS.

OTOH, if the IAF or FAF is a marker beacon and the equipment to detect them in your plane is broken, you can still legally fly the ILS if the IAF is a co-located LOM (compass locator and marker beacon) and you have ADF equipment in your plane. Otherwise, you cannot legally fly the ILS.

At least, that is my understanding.