6. MCDU / FMS Guide
- 6.1 Objective
- 6.2 INIT A Page
- 6.3 Flight Plan Page
- 6.4 INIT B Page
- 6.5 Performance Pages
- 6.6 Key Pilot Tasks and common errors
- 6.7 Crosscheck Concept
6.1 Objective
The MCDU (Multipurpose Control and Display Unit) is used to manage:
Correct setup is essential for safe and efficient flight operations.
General Philosophy
- The FMGS manages the flight only if correctly programmed
- Pilots must always verify inputs
- Never rely blindly on automation
6.2 INIT A Page
Used for basic flight initialization.
Required Entries:
- FROM / TO → Departure & Destination
- FLT NBR → Flight Number
- COST INDEX → Airline value
- CRZ FL → Planned cruise level
Key Rule
All entries must be cross-checked by PM
6.3 Flight Plan Page
Route Input:
- Insert waypoints / airways
- Select SID and runway
- Insert STAR and approach
Important:
- Remove all discontinuities
- Verify route against briefing
- Check for incorrect turns
Core Rule
“No discontinuities without reason.”
6.4 INIT B Page
Fuel & Weight:
- Block Fuel → INSERT
- Zero Fuel Weight → INSERT
Importance:
Incorrect values will result in:
- Wrong fuel prediction
- Incorrect performance
6.5 Performance Pages
Takeoff (PERF TO)
- V1 / VR / V2 → INSERT
- FLEX Temperature → SET
- Thrust Reduction Altitude → SET
- Acceleration Altitude → SET
Climb (PERF CLB)
- Managed speed profile active
- Monitor climb performance
Cruise (PERF CRZ)
- Mach mode active
- Fuel predictions monitored
Descent (PERF DES)
- Managed descent profile available
- Used mainly for constraints
Approach (PERF APPR)
- VAPP → CHECK / INSERT
- Wind → INSERT
- Minimums → SET
6.6 Key Pilot Tasks and common errors
Key Pilot Tasks
During all phases:
- Monitor flight plan
- Check for route deviations
- Verify altitude and speed constraints
Common Errors
- Missing discontinuities
- Incorrect SID/STAR selection
- Wrong performance data
- Not updating approach
6.7 Crosscheck Concept
Every critical input must be:
- Entered by PF
- Verified by PM
Core Rule
“Garbage in → Garbage out.”
Key Principle
The MCDU is a tool:
- It supports the pilot
- It does not replace decision-making
Outcome
A correctly programmed MCDU ensures: