The startup procedure for the Airbus A320 involves a sequence of actions to safely power up the aircraft and start its engines. This procedure follows the Airbus Standard Operating Procedures (SOPs). Below is a simplified overview:

1. Cockpit Preparation

• Ensure the aircraft is powered using either:

  • External Power (from ground power) or

  • APU (Auxiliary Power Unit).

• Perform cockpit setup:

  • Align ADIRS (Air Data/Inertial Reference System) on the overhead panel.

  • Complete preflight checks, including system initialization, FMGC (Flight Management and Guidance Computer) setup, and fuel checks.

2. APU Start

• If external power is unavailable or the engines need air for start:

  • Turn the APU MASTER SW to ON.

  • Press the APU START button.

  • Wait for the APU to stabilize (indicated on the ECAM display).

3. Pushback and Engine Start Authorization

• Coordinate with ATC and ground crew for clearance to start engines and push back if required.

• Set Beacon Light to ON (overhead panel) to signal the aircraft is active.

4. Engine Start Procedure

• Set the ENG MODE selector (on the center pedestal) to IGN/START.

• Start each engine individually:

  1. Start Engine 2:

     • Move the ENG 2 MASTER switch to ON.

     • Monitor the ECAM for:

       • N2 rotation (greater than 10%).

       • Ignition and fuel flow.

       • Rise in EGT (Exhaust Gas Temperature) and stabilization.

  2. Start Engine 1:

     • Repeat the same steps for ENG 1 MASTER.

5. Engine Stabilization and After-Start Checks

• Ensure both engines stabilize at idle:

  • N2: ~58-62%.

  • EGT: Within normal limits.

• Switch ENG MODE selector back to NORM.

• Perform after-start checks:

  • Verify hydraulic pressure.

  • Turn on APU BLEED (if required) or shut down the APU.

  • Set the ANTI-ICE if conditions require.

  • Check flight control surfaces via the ECAM flight control page.

6. Taxi Preparation

• Set Flaps as required for takeoff.

• Perform the Before Taxi Checklist:

  • Verify flight instruments.

  • Arm Ground Spoilers.

  • Set Rudder Trim to zero.

  • Check the brake system.

7. Taxi Out

• After completing the start-up sequence, request taxi clearance from ATC.

• Begin taxiing while monitoring engine performance and systems.

This sequence may vary slightly depending on airline SOPs, operational conditions, or specific procedures required by ground handling or maintenance teams. Always refer to the FCOM (Flight Crew Operating Manual) for precise guidance.