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Use this procedure when its prerequisites apply. Confirm each required aircraft state before acknowledging the corresponding checklist item.

General

Enter this procedure after completion of the engine-start sequence and verification of the applicable engine-running condition. The start-lever IDLE check confirms the completed configuration; it does not replace the N2-gated fuel-admission steps in Engine Start. Complete generator, heat, air-system and start-switch selections. Verify ground equipment clear, the assigned takeoff flap configuration and the required flight-control check before taxi movement. Use the assigned taxi route and steering/braking procedure.

1. Generators 1 and 2 — On

After completion of the engine-start procedure, select generators 1 and 2 ON. Verify the required generator and bus indications.
Expected response: ONVerification: Verify both generator switch/source outcomes and actual bus supply.

2. Probe heat — On

Apply the checklist’s literal OFF or ON requirement to all applicable probe heat systems for the configured aircraft.
Expected response: ONVerification: Confirm the relevant switch states and both probe-system outcomes.

3. Wing anti-ice — As needed

For an explicit OFF, establish OFF. For As needed, first resolve the mission’s icing decision using an approved policy; do not infer it from temperature alone.
Expected response: As neededVerification: Verify the selected switch state and the relevant valve/annunciator outcome under a the applicable decoder.

4. Engine anti-ice — As needed

Apply the required anti-ice state to the applicable engines; resolve As needed before issuing a command.
Expected response: As neededVerification: Require switch-state and corresponding system/annunciator evidence.

5. Pack switches — Auto

Set both pack switches AUTO. Verify both selector positions using the applicable detent decoding.
Expected response: AUTOVerification: Read both selector states and confirm the requested detent.

6. Isolation valve — Auto

Select the isolation-valve selector AUTO. Verify the selector position; verify actual valve state separately when required.
Expected response: AUTOVerification: Decode and compare the selector position; verify physical valve state separately where required.

7. APU bleed — Off

Select APU bleed OFF in accordance with the applicable air-supply configuration. Verify the required switch and valve indications.
Expected response: OFFVerification: Require APU bleed-switch/valve state and relevant source evidence.

8. APU switch — As needed

Resolve the required APU state for this phase from the mission’s electrical/air plan, then use a validated APU switch procedure.
Expected response: As neededVerification: Verify selector and APU availability/outcome, not just EGT.

9. Engine start switches — Cont

Select both engine start switches CONT. Verify both rotary-switch positions. These switches are separate from the fuel/start levers.
Expected response: CONTVerification: Require both applicable rotary-switch states.

Continue after this procedure

Continue to Before taxi — part 2. The checklist adds no condition between these parts; the next part’s individual step conditions still apply.
Last modified on October 30, 2026