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▵h ▵ 40 × 3 × 100 = 12 000 ft.
• The pilot should not attempt to penetrate a cell or clear its top by less than 5 000 ft vertical,
because otherwise the aircraft may encounter severe turbulence.
If the top of cell is at or above 25 000 ft, overflying should be avoided due to the possibility
of encountering turbulence stronger than expected.
In the same way, the pilot should avoid flying under a thunderstorm because of possible
windshear, microbursts, severe turbulence, or hail.
Turbulence mode
• The turbulence detection mode is most effective when the ND is set on 40 nm and the
antenna is tilted to avoid ground return.
• When examining areas of heavy rainfall in WX+T mode, the flight crew should adjust
antenna tilt frequently, because turbulence areas vary with the altitude.
• Closely spaced (or thin lines between) color gradations are usually associated with severe
turbulence.
FLIGHT INSTRUMENT TOLERANCES
Applicable to:
The values below apply to aircraft in symmetrical flight (no sideslip), in clean configuration, and in
straight and level flight.
ALTITUDE TOLERANCES :
PFD 1 or PFD 2 at ground ‐ check : plus or minus 25 ft
‐ STBY ALTI at ground check : plus or minus 300 ft
Note: On the ground, the vibrator of the standby altimeter is off. That is why the standby
altimeter tolerance value is high. In flight, the vibrator is on and the value is lower.
MAXIMUM DIFFERENCES BETWEEN ALTITUDE INDICATIONS :
ALTITUDE (ft) COMPARISON BETWEEN
SPEED ADR 1 and
ADR 2 (on PFD)
ADR 3 and ADR 1 or ADR
3 and ADR 2 (on PFD)
STBY ALTI and any
ADR 1 or 2 or 3
GND CHECK - 20 20 See (1)
FL 50 250 55 55 90
To be continued on next page
A330/A340 FLIGHT CREW
OPERATING MANUAL
PROCEDURES
SUPPLEMENTARY PROCEDURES
NAVIGATION
A330/A340 FLEET PRO-SUP-34 P 8/24
FCOM 19 AUG 10
Continued from previous page
ALTITUDE (ft) COMPARISON BETWEEN
SPEED ADR 1 and
ADR 2 (on PFD)
ADR 3 and ADR 1 or ADR
3 and ADR 2 (on PFD)
STBY ALTI and any
ADR 1 or 2 or 3
FL 100 250 60 60 130
FL 200 300 95 100 220
FL 300 .82 120 130 320
FL 410 .82 145 150 380
(1) on the ground, the check is meaningless as the standby altimeter vibrator is off
MAXIMUM DIFFERENCES BETWEEN SPEED/MACH INDICATIONS :
SPEED (kt) MACH COMPARISON BETWEEN
ADR 1 and
ADR 2 (on PFD)
ADR 3 and ADR 1 or ADR
3 and ADR 2 (on PDF)
STBY ASI and any
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 4 0.010 4 0.010 7 -
FL 100 250 4 0.009 4 0.009 7 -
FL 200 300 3 0.008 3 0.009 8 -
FL 300 .82 3 0.009 3 0.009 8 -
FL 410 .82 4 0.009 4 0.009 7 -
MAXIMUM DIFFERENCE BETWEEN ND MAGNETIC HEADING INDICATIONS
Maximum difference between magnetic heading indications on the NDs : 4 °.
FLIGHT INSTRUMENT TOLERANCES
Applicable to: ,
The values below apply to aircraft in symmetrical flight (no sideslip), in clean configuration, and in
straight and level flight.
ALTITUDE TOLERANCES
PFD 1 or PFD 2 at ground check : plus or minus 25 ft
MAXIMUM DIFFERENCES BETWEEN ALTITUDE INDICATIONS :
ALTITUDE (ft) COMPARISON BETWEEN
SPEED ADR 1 and
ADR 2 (on PFD)
ADR 3 and ADR 1 or ADR
3 and ADR 2 (on PFD)
ISIS and any
ADR 1 or 2 or 3
GND CHECK - 20 20 60
FL 50 250 55 55 90
FL 100 250 60 60 130
To be continued on next page
A330/A340 FLIGHT CREW
OPERATING MANUAL
PROCEDURES
SUPPLEMENTARY PROCEDURES
NAVIGATION
A330/A340 FLEET PRO-SUP-34 P 9/24
FCOM 19 AUG 10
Continued from previous page
ALTITUDE (ft) COMPARISON BETWEEN
SPEED ADR 1 and
ADR 2 (on PFD)
ADR 3 and ADR 1 or ADR
3 and ADR 2 (on PFD)
ISIS and any
ADR 1 or 2 or 3
FL 200 300 95 100 220
FL 300 .82 120 130 320
FL 410 .82 145 150 380
MAXIMUM DIFFERENCES BETWEEN SPEED/MACH INDICATIONS :
SPEED (kt) MACH COMPARISON BETWEEN
ADR 1 and
ADR 2 (on PFD)
ADR 3 and ADR 1 or ADR
3 and ADR 2 (on PDF)
ISIS and any
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 4 0.010 4 0.010 7 -
FL 100 250 4 0.009 4 0.009 7 0.030
FL 200 300 3 0.008 3 0.009 8 0.031
FL 300 .82 3 0.009 3 0.009 8 0.025
FL 410 .82 4 0.009 4 0.009 7 0.023
Mach values lower than M 0.50 in climb, and M 0.45 in descent, are not displayed on ISIS.
MAXIMUM DIFFERENCE BETWEEN ND MAGNETIC HEADING INDICATIONS
Maximum difference between magnetic heading indications on the NDs : 4 °.
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A330/A340机组操作手册 FLIGHT CREW OPERATING MANUAL FCOM 11(100)
