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OPERATING MANUAL
PROCEDURES
SUPPLEMENTARY PROCEDURES
NAVIGATION
A318/A319/A320/A321 FLEET PRO-SUP-34 P 6/28
FCOM 19 AUG 10
• The following formula calculates the vertical distance between the top of the cell and the
aircraft flight level :
◂h (feet) ∼ d(NM) × Tilt (degrees) × 100.
Example :
Cell at 40 nm disappearing at less than 3 ° downtilt
◂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: ALL
GENERAL
The values below apply to aircraft in symmetrical flight (no sideslip), in the clean configuration, and
in straight and level flight.
Applicable to:
ALTITUDE TOLERANCES
PFD 1 or 2 at ground ‐ check : plus or minus 25 ft (8 m)
‐ standby altimeter at ground check : plus or minus 300 ft (91 m)
Note: On ground, as the standby altimeter’s vibrator is off, the standby altimeter’s tolerance
value is high. In flight, the vibrator is on and the value is lower.
A318/A319/A320/A321 FLIGHT CREW
OPERATING MANUAL
PROCEDURES
SUPPLEMENTARY PROCEDURES
NAVIGATION
A318/A319/A320/A321 FLEET PRO-SUP-34 P 7/28
FCOM 19 AUG 10
Applicable to:
,
,
MSN,,,,
ALTITUDE TOLERANCES
PFD 1 or 2 at ground check : plus or minus 25 ft (8 m)
Applicable to:
MAXIMUM DIFFERENCES BETWEEN ALTITUDE INDICATIONS
ALTITUDE (ft) COMPARISON BETWEEN
FL/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 (6 m) 20 (6 m) (1)
FL 50/250 kt 50 (15 m) 80 (24 m) 130 (40 m)
FL 100/250 kt 55 (17 m) 80 (24 m) 185 (56 m)
FL 200/300 kt 90 (27 m) 145 (44 m) 295 (90 m)
FL 300/.78 130 (40 m) 355 (108 m) 390 (119 m)
FL 390/.78 130 (40 m) 365 (111 m) 445 (136 m)
(1) On ground, the check is meaningless because the standby altimeter’s vibrator is off.
Applicable to:
MAXIMUM DIFFERENCES BETWEEN ALTITUDE INDICATIONS
ALTITUDE (ft) COMPARISON BETWEEN
FL/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 (6 m) 20 (6 m) (1)
FL 50/250 kt 50 (15 m) 65 (20 m) 130 (40 m)
FL 100/250 kt 55 (17 m) 80 (24 m) 185 (56 m)
FL 200/300 kt 90 (27 m) 135 (41 m) 295 (90 m)
FL 300/.78 130 (40 m) 195 (59 m) 390 (119 m)
FL 390/.78 130 (40 m) 195 (59 m) 445 (136 m)
(1) On ground, the check is meaningless because the standby altimeter’s vibrator is off.
A318/A319/A320/A321 FLIGHT CREW
OPERATING MANUAL
PROCEDURES
SUPPLEMENTARY PROCEDURES
NAVIGATION
A318/A319/A320/A321 FLEET PRO-SUP-34 P 8/28
FCOM 19 AUG 10
Applicable to:
,
,
MSN,,,,
MAXIMUM DIFFERENCES BETWEEN ALTITUDE INDICATIONS
ALTITUDE (ft) COMPARISON BETWEEN
FL/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 (6 m) 20 (6 m) 100 (30 m)
FL 50/250 kt 50 (15 m) 65 (20 m) 130 (40 m)
FL 100/250 kt 55 (17 m) 80 (24 m) 185 (56 m)
FL 200/300 kt 90 (27 m) 135 (41 m) 295 (90 m)
FL 300/.78 130 (40 m) 195 (59 m) 390 (119 m)
FL 390/.78 130 (40 m) 195 (59 m) 445 (136 m)
Applicable to:
AIRSPEED/MACH TOLERANCES
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
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 5 0.011 7 -
FL 100/250 kt 4 0.005 4 0.011 8 -
FL 200/300 kt 3 0.007 4 0.008 9 -
FL 300/0.78 3 0.010 7 0.017 9 -
FL 390/0.78 3 0.010 6 0.019 8 -
Applicable to:
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A320机组操作手册FLIGHT CREW OPERATING MANUAL 14(91)
