#AIRPLANE LOCALIZER MANUAL#

When you use LNAV for this, your means of maintaining the centreline of the approach is the GPS / FMC / LNAV. The use of LNAV on a Localiser approach is fine as long as you have a valid Localiser signal and you remain within tolerance.

So what’s going here? Cutting to the chase … This instrument applies to the conduct of NPA procedures ( excluding LLZ approaches) by … in B777-300ER aircraft with an RNP-capable RNAV system. The FMCS may be used to fly a RNAV approach procedure that overlays an ILS, LOC, LOC-BC, LDA, SDF, or MLS approach procedure when the localizer facility is inoperative subject to appropriate operational considerations, procedures, constraints, and authorizations.ĬASA Instrument 187/13 GNSS Primary Means Navigation When operated in this configuration, the FMCS may be used for enroute, terminal area operations and instrument approach navigation ( excludingILS, LOC, LOC-BC, LDA, SDF, and MLS approach procedures). The FMCS has been shown to meet the requirements of FAA AC 20-130A for a multi-sensor area navigation system when operated with radio or Global Position System (GPS) updating.

#AIRPLANE LOCALIZER MANUAL#

Finally the 777 Airplane Flight Manual references the (non) use of the FMC for the purposes of a Localizer Approach, but this is actually miss-leading …ġ1.4 The holder of a command instrument rating shall not carry out an ILS or LLZ approach in IMC as pilot in command of an aircraft unless, within the preceding 35 days, that person has performed in flight, or in a synthetic flight trainer approved for the purpose, either one of those approaches.ī777 AFM Normal Procedures Flight Management Computer System (FMCS) Officially classed as an NPA – at the same time a localizer approach meets the recency need for an ILS precision approach (CAO 40.2.1-11.4) meanwhile our GPS Primary Instrument specifically excludes LLZ approaches (A1 15.5) even as PBN procedures make no reference. Basically it’s half a conventional ILS approach, where the glide slope (vertical path) component has failed, but we can still fly the approach using the Localizer (lateral path) albeit to higher minima and visibility requirements. Localizer approaches are something of an oddity as far as they go. We’ve moved away from the archaic limitations and practices of the specifics of manually and/or automatically referenced individual means of navigation sources and instead benefit from a system that encompasess and accounts for the limitations of all the individual available equipment and provides the best navigation information possible at any time. PBN (Position Based Navigation) is here and exists in parallel with our existing Primary Means Navigation approval. Recently we’ve seen some changes in the way we do aircraft Navigation, or at least in the way we regulate it. This question was asked during a briefing on PBN which has caused some confusion. I was recently asked whether we could still use LNAV to fly a Localizer Instrument Approach, and whether that was the preferred mode.

Airplane localizer