ADF required for an ILS?

[GA Driver]

Went for a fly the other day in a Cirrus. Impressive aircraft all around, very nicely decked out with all the latest equipment including a GNS430, had everything except a trusty old ADF.:eek:

I didn't think to much of this until it came time to do the ILS!:hmm:

Wasn't a major problem this time considering the A/C GPS is IFR approved and it showed as we flew directly over the locator. Point is do you actually need an ADF on board for the ILS approach? (This airport doesn't have a DME either before I get into that avenue!) We always get asked "Contact the tower passing the locator," but the chart doesn't say that you require the ADF.

Any thoughts?

Cheers,
GA Driver

[VH-ABC]

Would have thought as long as the GPS is approved, and so is the driver, getting the positive fix over the locator by way of a GPS would be fine... however the GPS doesnt really TELL you when you have station passage and would be a bit harder to monitor whilst attempting the ILS (Maybe the flasher GPS units do, but ones I have used definately dont).

[FJ738]

Assuming this is a PVT operation in controlled airspace, so long as it has 1 VOR/ILS, DME, Marker receiver and the GNS430 there are no problems.

Marker receiver is required when its not an ILS/DME approach, such is the case here.

The GNS430 can be used as GPS/RNAV equipment and therefore provide the fix at the NDB.

So to answer the question, the ADF is not required.

[Hugh Jarse]

GA Driver, the only reference I'm aware of to ADF's and ILS's is if you wish to apply the special alternate minima. CAO 20.18 does not specify which aids an A/C should have.

You probably know that to hold an instrument rating you must always be rated on the NDB as a minimum.

Of the 6 ILS installations at YSSY, only 2 pass over NDB's. Only 1 has a locator and that's at the MM.

NDB's I think will head the way of VAR's.:confused: and be extinct in the not too distant future.

[YMML]

One other problem that has come up in the past for me is IFR planning without an ADF.

Remember all GPS approaches require an alternate with a ground based navaid. You'll need to carry fuel to an alternate with a DME, VOR or ILS app. In certain parts of the country that can equate to some pretty big distances!

[dogcharlietree]

The ILS comprises localizer and glide path equipment and marker beacons, usually supported by a locator (NDB).
In the event of a locator (NDB) failure, aircraft must join the ILS outside the outer marker.
In the event of glide path failure, only localizer procedure is available.
When marker beacons are not available, ILS may be used provided alternate fixes nominated on the instrument approach chart or NOTAM are used for altimeter checks.

[GA Driver]

Thanks all for the replies, I figured that considering it wasnt written anywhere, you werent required to have an ADF.

Thanks again:ok: :ok:
GA Driver

[RENURPP]

I agree 100% with FJ738.

Reference the comment regarding alternates, a location with a DME only does not suffice.

[Bula]

The locater is a requirement in certain situations on certain ILS approaches. If an ILS approach has an associated locator you must have an ADF unless a different procedures is available to intercept the ILS i.e. a DME Arc or Radar Vectors.

An example may be Canberra 35 ILS. If you go in there at night and the DME is u/s you Must have an ADF to intercept the ILS beacuse the approach frequency and tower is Closed.


Also on top of this the ILS must be intercepts prior to the Outer Marker.

[Tinstaafl]

Some years ago a DME was adequate for an alternate......then DME Approaches were removed. :sad:

Having the option made a difference re alternate planning.