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AIR DATA SWTG................................................................................................................ AS RQRD
STATUS
CAT 3 SINGLE ONLY INOP SYS
CAT 3 DUAL
A318/A319/A320/A321 FLIGHT CREW
OPERATING MANUAL
PROCEDURES
ABNORMAL AND EMERGENCY PROCEDURES
NAVIGATION
A318/A319/A320/A321 FLEET PRO-ABN-34 P 117/164
FCOM 19 AUG 10
UNRELIABLE SPEED INDICATION/ADR CHECK PROC - GENERAL
Applicable to:
Unreliable speed indication may be due to radome damage, or due to air probe failure or
obstruction.
The indicated altitude may also be affected, if static probes are affected.
Unreliable speed cannot be detected by the ADIRU. The flight control and flight guidance
computers normally reject erroneous speed/altitude source(s), provided a significant difference is
detected.
However, they will not be able to reject two erroneous speeds or altitudes that synchronously
and similarly drift away. In this remote case, the aircraft systems will consider the remaining
correct source as being faulty and will reject it. Consequently, the flight control and flight guidance
computers will use the remaining two wrong ADRs for their computation.
Therefore, in all cases of unreliable speed situation, the pilots must identify the faulty ADR(s)
and then switch it (them) OFF. If all ADRs provide unreliable data, keep one ADR on to keep the
stall warning protection. During this failure identification time, since the flight control laws may be
affected, it is recommended to maneuver the aircraft with care until the ADR(s) is (are) switched
OFF.
Unreliable speed indications may be suspected, either by:
Speed discrepancies (between ADR 1, 2, 3, ‐ and standby instruments).
‐ Fluctuating or unexpected increase/decrease/steady indicated speed, or pressure altitude.
‐ Abnormal correlation of the basic flight parameters (speed, pitch attitude, thrust, climb rate).
‐ Abnormal AP/FD/ATHR behavior.
‐ STALL warning, or OVERSPEED warnings, that contradicts with at least one of the indicated
speeds.
• Rely on the stall warning that could be triggered in alternate or direct law. It is not affected by
unreliable speeds, because it is based on angle of attack.
• Depending on the failure, the OVERSPEED warning may be false or justified. Buffet,
associated with the OVERSPEED VFE warning, is a symptom of a real overspeed condition.
‐ Inconsistency between radio altitude and pressure altitude.
‐ Reduction in aerodynamic noise with increasing speed, or increase in aerodynamic noise with
decreasing speed.
‐ Impossibility of extending the landing gear by the normal landing gear control.
A318/A319/A320/A321 FLIGHT CREW
OPERATING MANUAL
PROCEDURES
ABNORMAL AND EMERGENCY PROCEDURES
NAVIGATION
A318/A319/A320/A321 FLEET PRO-ABN-34 P 118/164
FCOM 19 AUG 10
UNRELIABLE SPEED INDICATION/ADR CHECK PROC - GENERAL
Applicable to: , , MSN,,,,
Unreliable speed indication may be due to radome damage, or due to air probe failure or
obstruction.
The indicated altitude may also be affected, if static probes are affected.
Unreliable speed cannot be detected by the ADIRU. The flight control and flight guidance
computers normally reject erroneous speed/altitude source(s), provided a significant difference is
detected.
However, they will not be able to reject two erroneous speeds or altitudes that synchronously
and similarly drift away. In this remote case, the aircraft systems will consider the remaining
correct source as being faulty and will reject it. Consequently, the flight control and flight guidance
computers will use the remaining two wrong ADRs for their computation.
Therefore, in all cases of unreliable speed, the pilots must identify the faulty ADR(s) and then
switch it (them) OFF. If all ADRs provide unreliable data, switch OFF the three ADRs to display
the Backup Speed Scale and fly the green area of the vertical speed scale. During this failure
identification time, since the flight control laws may be affected, it is recommended to maneuver the
aircraft with care until the ADR(s) is (are) switched OFF.
Unreliable speed indications may be suspected, either by:
Speed discrepancies (between ADR 1, 2, 3, ‐ and standby instruments).
‐ Fluctuating or unexpected increase/decrease/steady indicated speed, or pressure altitude.
‐ Abnormal correlation of the basic flight parameters (speed, pitch attitude, thrust, climb rate).
‐ Abnormal AP/FD/ATHR behavior.
‐ STALL warning, or OVERSPEED warnings, that contradicts with at least one of the indicated
speeds.
• Rely on the stall warning that could be triggered in alternate or direct law. It is not affected by
　
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