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IRS MONITOR (2L KEY)...................................................................................................PRESS
The IRS MONITOR page is displayed.
A/C HEADING....................................................................................................................ENTER
The heading must be entered in the SET HDG field (5R KEY).
Due to IR drift, the magnetic heading must be periodically crosschecked with the standby compass
and updated, if required.
A330/A340 FLIGHT CREW
OPERATING MANUAL
PROCEDURES
ABNORMAL AND EMERGENCY PROCEDURES
NAVIGATION
A330/A340 FLEET PRO-ABN-34 P 34/140
FCOM 19 AUG 10
IR ALIGNMENT IN ATT MODE
Applicable to: ,
If IR alignment is lost in flight, the navigation mode is inoperative (red ATT flag on the PFD, and red
HDG flag on the ND).
Aircraft attitude and heading may be recovered by applying the following procedure : The aircraft
must stay level, with a constant speed for 30 s.
MODE SELECTOR.......................................................................................................................ATT
LEVEL A/C ATTITUDE...............................................................................................................HOLD
CONSTANT A/C SPEED.................................................................................................... MAINTAIN
�� MCDU INITIALIZATION:
DATA (MCDU KEY)...........................................................................................................PRESS
The DATA INDEX page is displayed.
IRS MONITOR (2L KEY)...................................................................................................PRESS
The IRS MONITOR page is displayed.
A/C HEADING....................................................................................................................ENTER
The heading must be entered in the SET HDG field (5R KEY).
�� CDU INITIALIZATION �� :
DISPLAY SYS switch......................................................................................... AFFECTED SYS
DISPLAY DATA switch.......................................................................................................... HDG
H key................................................................................................................................PRESS
Degree marker, zero decimal point, ENT and CLR lights come on.
A/C HEADING....................................................................................................................ENTER
Enter the aircraft magnetic heading on the CDU
keyboard. Then press the ENT key to enter data.
Example : To enter 320 ° heading, dial 3, 2, 0, 0 then press ENT.
The heading will be displayed on the associated ND.
“HDG ... ATT MODE” will be displayed on the CDU.
Note: The CDU-entered heading is sent to the FMGC, and displayed in the SET HDG field
of the IRS MONITOR page.
Due to IR drift, the magnetic heading must be periodically crosschecked with the standby compass
and updated, if required.
A330/A340 FLIGHT CREW
OPERATING MANUAL
PROCEDURES
ABNORMAL AND EMERGENCY PROCEDURES
NAVIGATION
A330/A340 FLEET PRO-ABN-34 P 35/140
FCOM 19 AUG 10
NAV IR NOT ALIGNED
Applicable to: ALL
L2 This caution is available in Phase 2 (one engine running).
L1 POSITION MISMATCH
POSITION MISSING
PRESENT POSITION............................................................................................................. INSERT
EXCESS MOTION
IR 1(2)(3)(1+2)(2+3)(1+2+3) IN ALIGN
NAV FM/IR POS DISAGREE
Applicable to: ALL
L2 This message is generated by the FWC when it detects a significant drift between any of the FMS
positions and any of the IRS positions.
L1 A/C POS.................................................................................................................................CHECK
L2 Use the MCDU’s POSITION and IRS MONITOR pages. For flight continuation, consider periodic
NAV ACCURACY check.
A330/A340 FLIGHT CREW
OPERATING MANUAL
PROCEDURES
ABNORMAL AND EMERGENCY PROCEDURES
NAVIGATION
A330/A340 FLEET PRO-ABN-34 P 36/140
FCOM 19 AUG 10
NAV FM/GPS POS DISAGREE
Applicable to: ,
L2 The FMS and GPS positions differ by more than:
A longitude threshold ‐ that depends on the latitude:
• 0.5 min for latitude below 45 °
• 0.7 min for latitude at, or above, 45 °, and below 60 °
• 1 min for latitude at, or above, 60 °, and below 70 °
‐ A latitude threshold of 0.5 min, regardless of the latitude.
L1 A/C POS.................................................................................................................................CHECK
　
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