6
FLIGHT PHASES
APPROACH
J43126AA 00
© THALES AVIONICS S.A.
AIRBUS A318/319/320/321
Nav Accuracy check
Refer to Operator's SOPs.
If GPS available:
On PROG page,
GPS PRIMARY ...............Check
When GPS PRIMARY is shown (green),
the Accuracy is invariably HIGH.
If "GPS PRIMARY LOST" (amber)
appears in scratchpad and on ND,
proceed as for GPS not available.
ND message is not clearable.
If GPS not available or not
installed:
On PROG page,
Accuracy ............. Check HIGH
If Accuracy LOW:
Tune a suitable VOR/DME (auto or
manual) on RAD-NAV page,
Ex: LON
BRG/DIST [4R] .....Enter ident
Compare BRG/DIST (FMGC computed)
with radio indications on ND or DDRMI.
In the example, VOR1 needle is
crossing LON (VOR FMGC symbol),
showing 293° and 18 NM.
If discrepancy is below 1NM, accuracy
may be assumed to be HIGH.
If accuracy is evaluated LOW, refer to
SOPs, consider Raw data, EGPWS
deactivation and selected modes should
be used.
Predictive GPS
Refer to Part III: Multiphase – Position monitoring.
DESCENT THV001
CRZ OPT REC MAX
----- ----- FL393
<REPORT VDEV=+ 50FT
UPDATE AT
*[ ]
BRG /DIST
279° /13.5 TO EGLL27R
PREDICTIVE
<GPS GPS PRIMARY
REQUIRED ACCUR ESTIMATED
1.0NM HIGH 0.08NM
DESCENT THV001
CRZ OPT REC MAX
----- ----- FL393
<REPORT VDEV=+ 50FT
UPDATE AT
*[ ]
BRG /DIST
293° /18.1 TO LON
REQUIRED ACCUR ESTIMATED
1.0NM HIGH 0.35NM
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