Thales FMGS - DRIFT Rate Display Function; IRS MONITOR Page

MULTI PHASE
NAVIGATION management & monitoring 39
 IRS MONITOR page
Accessed from DATA INDEX 1/2
page:
IRS MONITOR [3L]........ Press
Mode of each IRS is shown: INVAL,
ALIGN, NAV, ATT.
When in ALIGN mode, Time To NAV
is shown as TTN XX (min).
A status message may be shown
next to the associated IRS, in case
of a malfunction. Possible status
messages are:
DATA INDEX 1/2 {}
POSITION
<MONITOR
IRS
<MONITOR
GPS
<MONITOR
<A/C STATUS
PRINT
FUNCTION>
AOC
FUNCTION>
IRS MONITOR
<IRS1
NAV
<IRS2
NAV
<IRS3
NAV
− IR FAULT,
− DELAYED MAINT,
− ENTER PPOS,
− SELECT ATT,
− EXCESS MOTION,
− SWITCH ADR,
IRS MONITOR
<IRS1 EXCESS MOTION
ALIGN TTN10
<IRS2
ALIGN TTN 7
<IRS3 ENTER HEADING
ATT
SET HDG
___._
− CHECK C/B,
− CDU FAULT,
− ENTER HEADING,
− REENTER PPOS,
− SYS BELOW –15°.
The SET HDG function (Option selected in
OPC file) is described in Part IV: FMS
degraded operations Ch 4.2 - IR alignment
in ATT mode.

DRIFT Rate display function
When FMGC switches to DONE, average
IRS DRIFT rate is shown for each IRS, in
NM/Hour, provided:
IRS MONITOR
DRIFT AT EGLL27R
<IRS1
NAV DRIFT 0.5NM/H
<IRS2
NAV DRIFT 1.5NM/H
<IRS3
NAV DRIFT 2.5NM/H
− IRS is in NAV mode,
− The landing RWY was as selected in
ACTIVE F-PLN. If not, DRIFT rate
computation is not correct.
See also Part II: Flight phases Ch 9 - Done
AIRBUS A318/319/320/321
© THALES AVIONICS S.A.
J43126AA 00