ILS Minimum Equipment
 

Good afternoon.

I would like to know what are the minimum equipment in an aerodrome necessary for a CAT I / CAT II / CAT III Precision Approach.

Jeppesen Airway Manual has got a table (taken from EU OPS) describing the "Failed or Downgraded Equipment - Effect on Landing Minimums Operations without Low Visibility Operations Approval". However, I'm not sure whether this table on the Jeppesen manual is valid worldwide or not.

In some countries, I've seen for example that an Outer Marker inoperative might be allowed, as long there is a way to precise its location using a DME or other equipment. In the Jeppesen Manual, it is written that in case of an Outer Marker inop, a height check at 1000ft will be acceptable as a replacement.

Thank you.

How are you going to check your height without a DME?

There is no requirement for a height check on an ILS for starts. Most companies use 1000' check.

Hello Skimbauer

The table "Failed or Downgraded Equipment - Effect on Landing Minimums Operations without Low Visibility Operations Approval" does not apply world wide and does not apply to CAT II/III anyway.

The bottom line is that the minimum equipment required for you to fly the final segment of the approach is that listed in the title of the plate. For instance "ILS RWY 25R" means localiser and glide slope, "LOC" means localiser, "ILS/DME" means localiser, glide slope and DME. An exception is that if it is an "ILS" and the glide slope is not working you can still fly to LOC minima if they are listed on the plate. There may be notes on the approach plate that other equipment is required for part of the procedure which isn't the final segment. For instance you may see "DME required" on the plate somewhere other than the title. That would mean you need DME for a segment before the FAF/FAP. In that case you could not fly the full procedure without the equipment listed although these days you would probably be able to substitue RNAV for a DME or NDB, or just get vectors to final instead.

However, failure of supplementary equipment may change your minima and you would need to check the table you mentioned (or the appropriate one for wherever you are) to see if you need to increase your minima. For instance, if there was no RVR available you could not fly to any CAT II/III minima but you could still fly to CAT I minima (by substituting ground visibility for RVR).

Thank you everyone for the replies. The minimum equipment for an ILS approach is variable depending on the country. I just thought that the ILS minimum equipment published on the Jeppesen Airway Manual was standard for every country, which happens to be not true.