4.6 Cruise

Objective

To maintain a stable and efficient flight at cruise altitude.

Establishing Cruise

• Aircraft levels off at cruise altitude
• Thrust reduces automatically

Autopilot & Automation

• Autopilot engaged
• Managed speed (Mach mode typically active)

Cruise Speed Management

During cruise, the aircraft should remain in Managed Speed Mode under normal conditions.

Standard Procedure

• Autopilot → ENGAGED
• Speed Mode → MANAGED (Mach mode)

The aircraft automatically optimizes:

• Fuel efficiency
• Speed profile

Exceptions

Selected speed may only be used if:

• ATC assigns a specific speed
• Turbulence requires speed adjustment
• Operational considerations demand deviation

Monitoring Duties

Both pilots:

• Monitor flight progress
• Check fuel consumption
• Verify route

Systems Monitoring (PM)

• ECAM parameters normal
• Monitor Mach number and fuel consumption
• Ensure compliance with ATC instructions
• Detect any unexpected automation behavior
  

Navigation

• Follow programmed route
• Monitor for deviations

ATC Interaction

• Maintain assigned altitude and speed
• Respond to new clearances

Situational Awareness

• Monitor weather
• Anticipate descent planning

Key Principles

• “Let the aircraft manage efficiency – intervene only when necessary.”
• Stay ahead of the aircraft
• Avoid complacency
• Continuously cross-check systems