# 6. MCDU / FMS Guide

# 6.1 Objective

The MCDU (Multipurpose Control and Display Unit) is used to manage:

- Flight planning
- Navigation
- Performance calculations
- Aircraft guidance

Correct setup is essential for safe and efficient flight operations.

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### 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

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</div>### 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

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</div>### Important:

- Remove all discontinuities
- Verify route against briefing
- Check for incorrect turns

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</div>### Core Rule

**“No discontinuities without reason.”**

# 6.4 INIT B Page

### Fuel &amp; Weight:

- Block Fuel → INSERT
- Zero Fuel Weight → INSERT

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</div>### 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

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</div>### Climb (PERF CLB)

- Managed speed profile active
- Monitor climb performance

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</div>### Cruise (PERF CRZ)

- Mach mode active
- Fuel predictions monitored

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</div>### Descent (PERF DES)

- Managed descent profile available
- Used mainly for constraints

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</div>### 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

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## Common Errors

- Missing discontinuities
- Incorrect SID/STAR selection
- Wrong performance data
- Not updating approach

# 6.7 Crosscheck Concept

Every critical input must be:

1. Entered by PF
2. Verified by PM

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</div>### Core Rule

**“Garbage in → Garbage out.”**

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</div>### Key Principle

The MCDU is a tool:

- It supports the pilot
- It does not replace decision-making

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</div>### Outcome

A correctly programmed MCDU ensures:

- Accurate navigation
- Efficient flight profile
- Reduced workload