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