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computation of the managed vertical modes CLB, DES and FINAL APPR, possible false GPWS
warnings in mountainous aeras).
ENHANCED GROUND PROXIMITY WARNING SYSTEM (EGPWS)
Applicable to: ALL
The Flight Management System (FMS) provides aircraft position inputs to the EGPWS for enhanced
functions processing purpose.
A330/A340 FLIGHT CREW
OPERATING MANUAL
PROCEDURES
SUPPLEMENTARY PROCEDURES
NAVIGATION
A330/A340 FLEET PRO-SUP-34 P 20/24
FCOM 19 AUG 10
The TERR pushbutton, located on the overhead panel, enables the activation or deactivation of the
EGPWS enhanced functions.
During all flight phases, when the navigation accuracy check performed by the pilots (as described
in chapter PRO NOR SOP and PRO NOR SRP 01) is positive, the enhanced functions should be
switched ON.
During climb, descent, approach, and go-around phases, when GPS PRIMARY is not available (or
not installed) and the FMS navigation accuracy check prevents the flight crew from using the NAV
mode in a phase of flight, the TERR pushbutton must be switched OFF. When the TERR pushbutton
is switched OFF, the ECAM “TERR OFF” memo is displayed.
Only the basic GPWS Modes 1 to 5 remain operative
If the TERR ON ND is not selected, and a terrain alert is generated, the terrain is automatically
displayed on the ND.
The brightness of the terrain indication on the ND is controlled via the weather radar brightness
control knob. If the weather radar brightness was set to low (due to bad weather) and a terrain alert
occurs, then the terrain display brightness will also be low. Therefore, when a terrain alert occurs, the
ND weather/terrain image brightness may need to be adjusted.
A330/A340 FLIGHT CREW
OPERATING MANUAL
PROCEDURES
SUPPLEMENTARY PROCEDURES
NAVIGATION
A330/A340 FLEET PRO-SUP-34 P 21/24
FCOM 19 AUG 10
ADIRS OPERATION
Applicable to: ALL
GENERAL
The ADIRS must be aligned : This allows them to operate in NAV mode, to continuously provide
the aircraft’s position. To complete the alignment, the ADIRS must be initialized to a navigation
starting point, from which the ADIRS determine subsequent aircraft positions during flight.
The pilot may check the ADIRS status, and the ADIRS drift, at any moment on the MCDU
POSITION MONITOR page.
A330/A340 FLIGHT CREW
OPERATING MANUAL
PROCEDURES
SUPPLEMENTARY PROCEDURES
NAVIGATION
A330/A340 FLEET PRO-SUP-34 P 22/24
FCOM 19 AUG 10
Applicable to: ALL
COMPLETE OR FAST ALIGNMENT
For alignment, the aircraft must be stationary on ground. Any aircraft motion will automatically
restart the alignment. Avoid alignment during an engine start, or while the engines are running.
The pilot may choose to perform a complete alignment (this takes about 10 min) or a fast
alignment (this takes about 30 s). In both cases, the ADIRS must be initialized to a navigation
starting point.
During a complete alignment, the ADIRS uses gravity to determine the aircraft attitude. It then
determines true heading, and estimates the present latitude.
During a fast alignment, the ADIRS resets the ground speed to 0. Therefore, the ADIRS will start
the position computation with accurate initial speed. The ADIRS does not estimate the latitude.
The procedure for ADIRS complete or fast alignment is the following :
All 3 ADIRS Control Panel mode selectors.................................................................................OFF
All 3 ADIRS Control Panel mode selectors................................................................................ NAV
If the mode selectors are set back to NAV within 5 s, the ADIRS perform a fast alignment.
Otherwise, the ON BAT light comes ON for five seconds, and the ADIRS then start a complete
alignment.
Applicable to:
POSITION INITIALIZATION
The alignment phase is completed, when the ADIRS is initialized to an appropriate position.
Perform this initialization as soon as possible, to prevent delays if an alignment error occurs.
MCDU coordinates.................................................................................................. CHECK/MODIFY
When the pilot enters or modifies the origin airport (FROM) or the CO RTE, the MCDU INIT
coordinates are reset to the airport reference point (extracted from the FMS database). The pilot
may also manually modify these coordinates.
If the MCDU INIT coordinates change, when the ADIRS are already in NAV mode, the RESET IRS
TO NAV message is triggered on the MCDU : Crosscheck the MCDU INIT coordinates against the
IRS position on the MCDU POSITION MONITOR page.
When the GPS is available, or for flights in good radio navigation coverage airspace, initialize the
　
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