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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 119/164
FCOM 19 AUG 10
UNRELIABLE SPEED INDICATION/ADR CHECK PROC - MEMORY ITEMS
Applicable to:
If the safe conduct of the flight is impacted:
MEMORY ITEM:
AP/FD.........................................................................................................................................OFF
A/THR.........................................................................................................................................OFF
�� PITCH/THRUST:
Below THRUST RED ALT.........................................................................................15° / TOGA
Above THRUST RED ALT and Below FL 100.............................................................10° / CLB
Above THRUST RED ALT and Above FL 100...............................................................5° / CLB
FLAPS........................................................................................................Maintain current CONFIG
SPEEDBRAKES........................................................................................................ Check retracted
L/G................................................................................................................................................UP
When at, or above MSA or Circuit Altitude: Level off for troubleshooting.
To be continued on next page
A318/A319/A320/A321 FLIGHT CREW
OPERATING MANUAL
PROCEDURES
ABNORMAL AND EMERGENCY PROCEDURES
NAVIGATION
A318/A319/A320/A321 FLEET PRO-ABN-34 P 120/164
FCOM 19 AUG 10
UNRELIABLE SPEED INDICATION/ADR CHECK PROC - MEMORY ITEMS (Cont'd)
LEVEL-OFF (PITCH & THRUST TABLE)
�� To level off for troubleshooting:
AP/FD................................................................................................................................OFF
A/THR................................................................................................................................OFF
Note: Check the actual slat/flap config. on ECAM, as flap auto-retraction may occur.
PITCH/THRUST FOR INITIAL LEVEL OFF
SLATS/FLAPS EXTENDED
Above 67 t 67 t - 57 t Below 57 t
CONF Speed Pitch (°)/Thrust (% N1)
3 F 7.0/62.4 7.0/58.4 7.0/53.0
2 F 8.5/62.3 8.5/58.3 8.5/53.0
1 + F S 4.5/61.3 4.5/57.2 4.5/52.3
1 S 7.5/60.2 7.5/55.8 7.5/51.0
CLEAN
FL Speed Pitch (°)/Thrust (% N1)
Below FL 200 250 kt 3.5/64.7 3.0/62.3 2.0/60.3
FL 200 - FL 320 275 kt 2.5/78.7 2.0/76.8 1.0/75.3
Above FL 320 M 0.76 3.0/84.6 2.5/83.3 2.0/80.8
FLYING TECHNIQUE TO STABILIZE SPEED :
Adjust pitch in order to fly the required flight path.
When target pitch is reached, flying intended flight path, adjust thrust to target :
If the aircraft pitch tends to increase, aircraft is slow, then increase thrust;
If the aircraft pitch tends to decrease, aircraft is fast, then decrease thrust.
To be continued on next page
A318/A319/A320/A321 FLIGHT CREW
OPERATING MANUAL
PROCEDURES
ABNORMAL AND EMERGENCY PROCEDURES
NAVIGATION
A318/A319/A320/A321 FLEET PRO-ABN-34 P 121/164
FCOM 19 AUG 10
UNRELIABLE SPEED INDICATION/ADR CHECK PROC - MEMORY ITEMS (Cont'd)
LEVEL-OFF (TROUBLESHOOTING) - WHEN FLIGHT PATH IS STABILIZED
PROBE/WINDOW HEAT.............................................................................................................ON
TECHNICAL RECOMMENDATIONS
Respect Stall Warning.
To monitor speed, refer to IRS Ground Speed variations.
�� If remaining altitude indication is unreliable:
Do not use FPV and/or V/S, which are affected.
ATC altitude is affected. Notify the ATC.
Refer to Radio altimeter.
CAUTION If the failure is due to radome destruction, the drag will increase and therefore
N1 must be increased by 5 %. Fuel flow will increase by about 27 %.
AFFECTED ADR IDENTIFICATION
Crosscheck all speed indications and Refer to 99 Duref Cible QRH (for F, S speeds) or Refer
to 99 Duref Cible QRH (for speed in clean CONF):
�� If at least one ADR is reliable:
Faulty ADR(s)..................................................................................................................OFF
　
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