Step 1: PreparationPrepare oxygenation, equipment, physiology, RSI medications, and the team before induction.Step 2: TimeoutSilence the room, state the airway plans, and confirm code status, device, operator, positioning, and medications.Step 3: Failed Attempt / Difficult AirwayAfter every failed attempt, change a meaningful variable and escalate early.Step 4: Post-AirwayConfirm the tube, secure it, set the ventilator, start analgesia/sedation, and complete follow-up.