‐ For this reason it is important to break up the action in three steps:
1. Release the brake pedals
2. Select A/SKID & N/W STRG sw OFF
3. Modulate brake pedal pressure to maximum 1 000 PSI. At low ground speed, adjust brake
pressure as required. Monitor the brake pressure on the BRAKE PRESS triple indicator.
‐ Task-sharing: The PF calls for “A/SKID & N/W STRG OFF” and the PNF then executes the action. In case of urgency and conditions permitting, the PF can himself select the A/SKID & N/ W STRG sw OFF without call.
PARKING BRAKE
‐ Use short successive parking brake applications to stop the aircraft.
‐ Brake onset asymmetry may be felt at each parking brake application
‐ If possible, delay the use of parking brake until low speed, to reduce the risk of tire burst and lateral control difficulties.
 

  ABNORMAL OPERATIONS
LANDING GEAR
A318/A319/A320/A321
FLIGHT CREW TRAINING MANUAL 

Intentionally left blank
 

  ABNORMAL OPERATIONS
NAVIGATION
A318/A319/A320/A321
FLIGHT CREW TRAINING MANUAL 

ADR/IRS FAULT
Applicable to: ALL
Each ADIRS has two parts (ADR and IRS), that may fail independently of each other. Additionally the IRS part may fail totally or may be available in ATT mode.
Single NAV ADR FAULT or NAV IRS FAULT are simple procedures, and only require action on the switching panel as indicated by the ECAM.
Dual NAV ADR or NAV IRS failures will cause the loss of AP, A/THR and flight controls revert to ALTN LAW.
Due to the low probability of a triple ADR failure, the associated procedure will not be displayed on the ECAM. In this case, the crew will refer to QRH procedure for ADR 1 + 2 + 3 failure.
There is no procedure for IRS 1 + 2 + 3 failure but the ECAM status page will give approach procedure and inoperative systems. In this unlikely event, the standby instruments are the only attitude, altitude, speed and heading references.
Note: To switch off an ADR, the flight crew must use the ADR pushbutton. Do not use the rotary selector, because this would also cut off the electrical supply to the IR part.
UNRELIABLE AIRSPEED INDICATIONS
Applicable to: ALL
PREFACE
Most failures modes of the airspeed/altitude system are detected by the ADIRS. These failures modes lead to the loss of corresponding cockpit indications and the triggering of associated ECAM drills.
However, there may be some cases where the airspeed or altitude output is erroneous without being recognized as such by the ADIRS. In these cases, the cockpit indications appear normal but are actually false and pilots must rely on their basic flying skills to identify the faulty source and take the required corrective actions. When only one source provides erroneous data, a straightforward
crosscheck of the parameters provided by the three ADRs allows the faulty ADR to be identified. This identification becomes more difficult in the extreme situation when two, or even all of three, sources provide erroneous information.
　
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