Thales FMGS - Accuracy [6 C]; ESTIMATED Position Error (EPE) [6 R]; REQUIRED Navigation Performance (RNP) [6 L]

MULTI PHASE
NAVIGATION management & monitoring 45
 REQUIRED Navigation Performance (RNP) [6L]
This field shows the RNP value (Required Navigation Performance) used
as reference by the system to determine the level of confidence
HIGH/LOW.
Defaulted RNP values are:
− En-route : 2NM,
− Terminal area: 1NM,
− Precision & GPS approach: 0.3NM,
− Non-precision approach: 0.5NM,
Or
− Values defined in NAVdb,
Or
− Values defined according to
operator’s requirements in OPC file.
hese values may be modified by
modified they are displayed
n
the pilot entry is greater than the
e
the pilot entry is greater than the value existing in OPC file "AREA

STIMATED Position Error (EPE) [6R]
T
pilot.
When
large font. Use the CLR key to retur
to the defaulted value.
If
value existing in NAVdb "PROCEDURE
RNP IS XX.XX" s-pad msg (amber) is
triggered. This message is also
triggered if the NAVdb RNP valu
becomes smaller than the pilot
entered value.
If
RNP IS XX.XX" s-pad msg (amber) is triggered. This message is also
issued if the OPC RNP value becomes smaller than the active pilot
entered value.
E
CRUISE THV001
CRZ OPT REC MAX
FL360 FL360 FL389
<REPORT
UPDATE AT
*[ ]
BRG /DIST
354° /382.2 TO EGLL27R
PREDICTIVE
<GPS GPS PRIMARY
REQUIRED ACCUR ESTIMATED
2.0NM HIGH 0.08NM
CRUISE THV001
CRZ OPT REC MAX
FL360 FL360 FL388
<REPORT
UPDATE AT
*[ ]
BRG /DIST
167° /110.8 TO LFBO14R
PREDICTIVE
<GPS GPS PRIMARY
REQUIRED ACCUR ESTIMATED
3.0NM HIGH 0.08NM
AREA RNP IS 2.00
sition Error).
the computed
gement.)
avigation source

CCURACY [6C]
This field shows the EPE (Estimated Po
EPE is the radius of a circle of uncertainty within which
position is located, with a probability of 95%.
(See also Part I: ch. 3.3 Navigation/Flight Mana
Its value is displayed at [6R] under ESTIMATED.
Current EPE is computed by the FMGC, based on n
data (e.g. GPS, radio navaids, IRS).
A
he accuracy based on EPE and RNP: This field shows t
− If EPE is below RNP, ACCURACY is HIGH,
− If EPE is above RNP, ACCURACY is LOW.
AIRBUS A318/319/320/321
© THALES AVIONICS S.A.
J43126AA 00