Menu Sign In Contact FAQ
Welcome to our forums

Why have ILS X / ILS Y / ILS Z ? (and which IAP types are missing in GPSs)

I don’t think the NDB (BZ) to ILS for Brize (EGVN) has the Cat A/B procedure in the database – only the Cat C for some reason – certainly that seems to be the case with our Garmin430s. Question – could you elect to fly a Cat C procedure in a lower Cat aircraft? By clearance with ATC?

Oxfordshire / Glocs

Timothy wrote:

Do you mean those in the States or worldwide? I know that the FAA are opposing the RNP designation, but it is going to become very widespread in Europe and the rest of the world and is supposed to be mandatory by 2024, so does that mean that Jepp DBs won’t have any RNAV approaches because they are all designated RNP?

I had heard that this was just a problem for Boeing but that may just be hearsay.

Hmm. We spent some time on this when preparing the talk for AERO 2018, and I could have sworn that you were part of the conversation, but perhaps you were busy with other things.

Approaches meeting the RNP APCH specification will be in the database but retrievable as RNAV XX GPS

Approaches meeting the RNP AR APCH specification will not be in the database for most of us — they never have been. In those aircraft whose FMSs are capable of RNP AR APCH, they will be retrievable as RNAV RNP XX.

The labelling is not just a problem for Boeing, but also the other manufacturers. Boeing and Airbus sent a rather stroppy “we’re not playing along” joint letter to Montreal, and Garmin are in the same boat. The label used to identify the approach is not simply a string in the nav database, but is generated based on the approach metadata.

The chart names in the US will remain RNAV (GPS) and RNAV (RNP) for the RNP APCH and RNP AR APCH Nav specifications respectively.

I could have sworn that you were part of the conversation

No, I stayed out of Friedrichshafen this year, if you remember.

But what you have written is as we have documented in Edition 3, which will be winging its way to you very shortly. Just one page of index to go.

Balliol, many approaches are missing from the database. I would have no hesitation using the C

EGKB Biggin Hill
54 Posts
Sign in to add your message

Back to Top