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AIRSPEED/MACH TOLERANCES
Maximum differences between Speed/Mach indications :
A318/A319/A320/A321 FLIGHT CREW
OPERATING MANUAL
PROCEDURES
SUPPLEMENTARY PROCEDURES
NAVIGATION
A318/A319/A320/A321 FLEET PRO-SUP-34 P 9/28
FCOM 19 AUG 10
SPEED (kt) MACH COMPARISON BETWEEN
ADR 1 and ADR 2 (on PFD) ADR 3 and ADR 1,
or ADR 3 and ADR 2
STBY ASI and any
FL/SPEED ADR 1, or 2, or 3
SPEED MACH SPEED MACH SPEED MACH
GND CHECK 6 0.008 6 0.008 6 -
FL 50/250 kt 4 0.005 4 0.007 7 -
FL 100/250 kt 4 0.005 5 0.008 8 -
FL 200/300 kt 3 0.007 5 0.011 9 -
FL 300/0.78 3 0.010 5 0.014 9 -
FL 390/0.78 3 0.010 4 0.014 8 -
Applicable to:
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MSN,,,,
MAXIMUM DIFFERENCES BETWEEN SPEED/MACH INDICATIONS
SPEED (kt) MACH COMPARISON BETWEEN
ADR 1 and ADR 2 (on PFD) ADR 3 and ADR 1,
FL/SPEED or ADR 3 and ADR 2 ISIS and any ADR 1, or 2, or 3
SPEED MACH SPEED MACH SPEED MACH
GND CHECK 6 0.008 6 0.008 6 -
FL 50/250 kt 4 0.005 4 0.007 7 -
FL 100/250 kt 4 0.005 5 0.008 8 0.032
FL 200/300 kt 3 0.007 5 0.011 9 0.033
FL 300/0.78 3 0.010 5 0.014 9 0.025
FL 390/0.78 3 0.010 4 0.014 8 0.025
Mach values lower than M0.50 in climb, and M0.45 in descent, are not displayed on ISIS.
Applicable to: ALL
HEADING TOLERANCES
Maximum differences between magnetic heading indications on the NDs : 4 °.
A318/A319/A320/A321 FLIGHT CREW
OPERATING MANUAL
PROCEDURES
SUPPLEMENTARY PROCEDURES
NAVIGATION
A318/A319/A320/A321 FLEET PRO-SUP-34 P 10/28
FCOM 19 AUG 10
ADIRS OPERATION
Applicable to:
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.
A318/A319/A320/A321 FLIGHT CREW
OPERATING MANUAL
PROCEDURES
SUPPLEMENTARY PROCEDURES
NAVIGATION
A318/A319/A320/A321 FLEET PRO-SUP-34 P 11/28
FCOM 19 AUG 10
Applicable to:
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MSN,,,
4617,
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.
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 an 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
The ALIGN light remains OFF.
A318/A319/A320/A321 FLIGHT CREW
OPERATING MANUAL
PROCEDURES
SUPPLEMENTARY PROCEDURES
NAVIGATION
A318/A319/A320/A321 FLEET PRO-SUP-34 P 12/28
FCOM 19 AUG 10
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.
The ALIGN light comes ON, and remains steady until the alignment is complete.
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
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A320机组操作手册FLIGHT CREW OPERATING MANUAL 14(92)
