Thales FMGS - Nav Accur Downgrad

24
FLIGHT PHASES
APPROACH
J43126AA 00
© THALES AVIONICS S.A.
AIRBUS A318/319/320/321
 NAV ACCUR DOWNGRAD
Defaulted RNP values displayed on PROG
page are:
− Terminal area: 1 NM,
− Precision and GPS approaches: 0.3
NM,
− Non-precision approach: 0.5 NM.
These values may be customized in OPC
file.
Accuracy HIGH is displayed during
intermediate approach if EPE is less than
REQUIRED value.
When RNP decreases to final approach
value, and if this is less than existing
EPE,
− ACC changes to LOW on PROG page,
− NAV ACCUR DOWNGRAD message is
triggered on scratchpad and ND.
This frequently occurs for non GPS A/C.
During a NPA, according to SOPs, this
situation may require reversion to
selected modes and use of raw data.
Intermediate approach
APPROACH THV001
CRZ OPT REC MAX
----- ----- FL385
<REPORT
UPDATE AT
*[ ]
BRG /DIST
161° /15.6 TO LFBO14R
REQR DIST TO LAND= 12NM
DIR DIST TO DEST= 16NM
REQUIRED ACCUR ESTIMATED
1.0NM HIGH 0.60NM
Final approach
APPROACH THV001
CRZ OPT REC MAX
----- ----- FL385
<REPORT
UPDATE AT
*[ ]
BRG /DIST
161° /15.6 TO LFBO14R
REQD DIST TO LAND= 12NM
DIR DIST TO DEST= 16NM
REQUIRED ACCUR ESTIMATED
0.5NM LOW 0.60NM
NAV ACCUR DOWNGRAD