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- From: lhe@sics.se (Lars-Henrik Eriksson)
- Subject: Re: DME/Radar rquired--why--Answer
- In-Reply-To: wd@cs.tu-berlin.de's message of 27 Jan 1993 10:47:30 GMT
- Message-ID: <LHE.93Jan27163729@anhur.sics.se>
- Sender: news@sics.se
- Organization: Swedish Institute of Computer Science, Kista
- References: <2688@usna.NAVY.MIL> <1993Jan26.174038.28354@pony.Ingres.COM>
- <WD.93Jan27114724@sam.cs.tu-berlin.de>
- Date: Wed, 27 Jan 1993 15:37:29 GMT
- Lines: 28
-
- In article <WD.93Jan27114724@sam.cs.tu-berlin.de> wd@cs.tu-berlin.de (Wolfgang Diestelkamp) writes:
- Technically, the poinmt at which you intercept the glide on an ILS
- is called final approach *point* (FAP).
-
- I believe that the FAA uses the term "FAF" for both the FAF and FAP.
-
- The FAP may or may not
- coincide with the FAF, and in fact an FAF is not necessary for
- every approach (as pointed out earlier).
- This is stressed by the fact that in our (European, based on ICAO) rules
- for setting up a MDA for a non-precision approach, it is *explicitely*
- considered whether the approach has a FAF or not; in the first case,
- a margin of 75' is added, in the latter case this becomes 90'.
-
- A good example of an approach without a FAF is an NDB or VOR (*not*
- VORDME) approach where the facility on located on, or very close to,
- the airport and there is no other suitable facility that can be used
- to define a FAF.
-
- Usually an NDB approach would use a locator at approximately 4 miles
- from the runway as both the IAF and the FAF. The MAP would be
- determined by timing from the FAF. If the NDB is too close to the
- runway, it cannot be used as the FAF, but it can be used as the MAP.
- --
- Lars-Henrik Eriksson Internet: lhe@sics.se
- Swedish Institute of Computer Science Phone (intn'l): +46 8 752 15 09
- Box 1263 Telefon (nat'l): 08 - 752 15 09
- S-164 28 KISTA, SWEDEN Fax: +46 8 751 72 30
-