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If the GPS is no longer primary, the message “GPS PRIMARY
LOST” is displayed on the ND and in the MCDU scratchpad.
Notice that the navigation accuracy level stays at HIGH.
Nevertheless, the navigation accuracy has to be verified. The
SOP recommends in such a case to perform the comparison in a
hourly base.
NAVIGATION MENU Normal operation (B) 33/43
This check has to be performed whenever the following cases
occur:
- IRS only navigation,
- The PROG page displays LOW accuracy,
- “NAV ACCUR DOWNGRAD” message appears on the MCDU
and on the ND.
NAVIGATION MENU Normal operation (B) 34/43
To perform this check, you have to use the selected nav aids
and display them on the ND.
We have set the ND range to 80. The VOR “Sierra Papa
Romeo” has been manually tuned on receiver 1 and the VOR
“Papa Alpha Sierra” on receiver 2.
Note that the VOR “Papa Alpha Sierra” is the next “TO”
waypoint of the flight plan.
NAVIGATION MENU Normal operation (B) 35/43
There are two ways to do this check.
The first method is to compare the “TO” waypoint distance
and bearing which is FM computed data with the corresponding
nav aid DME distance and bearing.
Compare these two
distances
DME distance
Caallll tthhee PROG ppaaggee..
FM computed bearing
Raw data bearing
Compare these two
bearings
FM computed distance
NAVIGATION MENU Normal operation (B) 36/43
DME distance
Noo.. Seelleecctt tthhee PROGppbb ssw..
There are two ways to do this check.
The first method is to compare the “TO” waypoint distance
and bearing which is FM computed data with the corresponding
nav aid DME distance and bearing.
Compare these two
distances
FM computed bearing
Raw data bearing
Compare these two
distances
FM computed distance
NAVIGATION MENU Normal operation (B) 37/43
DME distance
Noo.. Seelleecctt tthhee PROGppbb ssw..
There are three ways to do this check.
The first method is to compare the “TO” waypoint distance
and bearing which is FM computed data with the corresponding
nav aid DME distance and bearing.
Compare these two
distances
FM computed bearing
Raw data bearing
Compare these two
distances
FM computed distance
NAVIGATION MENU Normal operation (B) 38/43
The second method is to insert a VOR/DME ident in the
BRG/DIST TO field on the PROG page and to compare the
computed BRG/DIST with the raw data on the ND.
We have typed the VOR/DME ident SPR in the scratchpad for
you.
IInnsseerrtt SPR iinn BRG // DIISTT ffiieelldd..
NAVIGATION MENU Normal operation (B) 39/43
The second method is to insert a VOR/DME ident in the
BRG/DIST TO field on the PROG page and to compare the
computed BRG/DIST with the raw data on the ND
We have typed the VOR/DME ident SPR in the scratchpad for
you.
Noo.. LLiinnee sseelleecctt 44R..
NAVIGATION MENU Normal operation (B) 40/43
The second method is to insert a VOR/DME ident in the
BRG/DIST TO field on the PROG page and to compare the
computed BRG/DIST with the raw data on the ND
We have typed the VOR/DME ident SPR in the scratchpad for
you.
Noo.. LLiinnee sseelleecctt 44R..
NAVIGATION MENU Normal operation (B) 41/43
We have now on the PROG page the computed bearing and
distance to the selected nav aid.
The distances shown on the ND and on the PROG page can
be compared.
Compare these two
distances
DME distance
Computed BRG / DIST
NAVIGATION MENU Normal operation (B) 42/43
The last method consists in checking that the raw data needle
passes through the blue FMGS generated symbol for the
VOR/DME, and that the position of this symbol corresponds to
the DME distance.
NAVIGATION MENU Normal operation (B) 43/43
Whatever method is used, if the error is less than 3 NM, the
check is positive and the FM position is reliable. The SOP
recommends to use the ND in ARC or NAV mode and managed
lateral guidance.
If the error is greater than 3 NM, you can consider that the FM
position is not reliable. In such a case, the SOP recommends to
use raw data for navigation and to monitor it.
MMoodduullee ccoommpplleetteedd
NEXT
NAVIGATION MENU Normal operation (B) 44/43
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EXIT
AUDIO GLOSSARY FCOM
RETURN
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AALLTTIIMMEETTEERRSSSSEETTTTIINNGG
NNAAVVIIGGAATTIIOONNAACCCCUURRAACCYYCCHHEECCKK
NAVIGATION MENU System presentation 1/13
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