Dual FMC required for RNP APCH B737NG?
Hello,
Is a dual FMC required for RNP APCH on the B737NG? We have some airplanes with 1x FMC. In the FCOM there is SP 4.6 about RNP APCH (AR), but not about RNP APCH. The SP requires 2x FMC but does a normal RNP APCH also require 2x FMC? Practical example, if the Jeppesen approach chart says RNP APCH with a LNAV and a LNAV/VNAV minima. Does this approach require a dual FMC setup to be flown? Thanks in advance! |
Originally Posted by unkki
(Post 10443762)
Hello,
Is a dual FMC required for RNP APCH on the B737NG? We have some airplanes with 1x FMC. In the FCOM there is SP 4.6 about RNP APCH (AR), but not about RNP APCH. The SP requires 2x FMC but does a normal RNP APCH also require 2x FMC? Practical example, if the Jeppesen approach chart says RNP APCH with a LNAV and a LNAV/VNAV minima. Does this approach require a dual FMC setup to be flown? Thanks in advance! I can, for example, fly RNP APCH in my Cessna 182 with a Garmin 400. Don't even need WAAS for LNAV minimums. |
RNP APCH requires an RNP of 0.3 during the final approach segment thus making it RNP and not RNAV, correct? Highest RNAV = RNAV1 (terminal area).
This stuff confuses me... From our manual: RNP Approach (RNP APCH) The PBN navigation specification RNP APCH is the official term for instrument approach procedures including the final approach segment. These procedures are often (and incorrectly) referred to as RNAV approaches, due to the (old) naming convention on Instrument Approach Charts (IAC), i.e. RNAV (GNSS) or RNAV (GPS) approaches. These procedures are gradually replaced by the new procedure name RNP RWY XX. |
RNP APCH has far less capabilities, thus far less requirements than RNP APCH AR or RNP AR.
RNP APCH is synonymous with RNAV(GPS)/ RNAV (GNSS)/RNAV (RNP) With RNP APCH: Initial and Intermediate segments RNP 1.0 RNP level down to 0.3 for Final Approach segment only. You can have 1 turn prior to the FAF. Missed approach not less than RNP 1.0 REQUIRED RNP APCH EQUIPMENT The minimum equipment required to perform RNP APCH operations is: One FMS One GPS One MCDU One FD One ND on the PF side Two FCU channels One PFD I have always been amused with the missed approach RNP 1.0 min, as when going missed, it all falls apart from 0.3 to 1.0 (from the MAP!) This requirement really restricts procedures, as commonly, the tower is the controlling obstacle. https://www.icao.int/MID/Documents/2...erspective.pdf |
Originally Posted by Unkki
Is a dual FMC required for RNP APCH on the B737NG? We have some airplanes with 1x FMC.
Originally Posted by unkki
The PBN navigation specification RNP APCH is the official term for instrument approach procedures including the final approach segment. These procedures are often (and incorrectly) referred to as RNAV approaches, due to the (old) naming convention on Instrument Approach Charts (IAC), i.e. RNAV (GNSS) or RNAV (GPS) approaches. These procedures are gradually replaced by the new procedure name RNP RWY XX.
You obviously cannot have a simple title "RNP RWY XX" because that would not designate what type of RNP approach it is, given there are LNAV, LNAV/VNAV, LP, LPV and AR types of RNP approaches. |
Originally Posted by Smythe
(Post 10443857)
RNP APCH has far less capabilities, thus far less requirements than RNP APCH AR or RNP AR.
RNP APCH is synonymous with RNAV(GPS)/ RNAV (GNSS)/RNAV (RNP) With RNP APCH: Initial and Intermediate segments RNP 1.0 RNP level down to 0.3 for Final Approach segment only. You can have 1 turn prior to the FAF. Missed approach not less than RNP 1.0 REQUIRED RNP APCH EQUIPMENT The minimum equipment required to perform RNP APCH operations is: One FMS One GPS One MCDU One FD One ND on the PF side Two FCU channels One PFD I have always been amused with the missed approach RNP 1.0 min, as when going missed, it all falls apart from 0.3 to 1.0 (from the MAP!) This requirement really restricts procedures, as commonly, the tower is the controlling obstacle. https://www.icao.int/MID/Documents/2...erspective.pdf https://cimg6.ibsrv.net/gimg/pprune....2cc1ccaccb.jpg https://cimg8.ibsrv.net/gimg/pprune....ac734cdde6.jpg |
HAF:
TCH 24' What was the VGSI set up for?? Fairly high DA for WAAS |
The sooner they sort the naming on all the approach charts the better.
|
Originally Posted by Smythe
(Post 10444356)
HAF:
TCH 24' What was the VGSI set up for?? Fairly high DA for WAAS The LPV DA was dictated by terrain in the level section of the missed approach. FAA TERPs map below: https://cimg2.ibsrv.net/gimg/pprune....98860b686a.jpg |
Thanks,
a great example of the missed going to RNP 1.0 at the DA.... Funny the chart shows CAT D... |
Originally Posted by Smythe
(Post 10444447)
Thanks,
a great example of the missed going to RNP 1.0 at the DA.... Funny the chart shows CAT D... |
That should clear things right up!
|
Originally Posted by Smythe
(Post 10444672)
That should clear things right up!
|
And when you get that clarity, it normally muddies the waters in another direction. Until of course clarity for that new issue is published which....
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