What are the main components of a commercial fuel policy under EASA rules?

The main components are taxi fuel, trip fuel, contingency fuel, alternate fuel (if required), final reserve fuel, additional fuel, and extra fuel at the commander’s discretion.

How is contingency fuel calculated for commercial operations?

Contingency fuel is typically the greater of 5% of planned trip fuel or the amount required to fly for 5 minutes at holding speed at 1500 ft above the destination aerodrome.

Why is alternate fuel included in commercial flight planning?

Alternate fuel ensures the aircraft can safely divert and land at an alternate aerodrome if landing at the original destination becomes impossible.

What is the purpose of final reserve fuel?

Final reserve fuel provides a minimum safety margin, allowing for 45 minutes of flight for piston engines or 30 minutes at holding speed at 1500 ft for turbine engines.

When should extra fuel be considered in commercial operations?

Extra fuel is carried at the commander’s discretion to address specific operational risks such as adverse weather, expected delays, or other uncertainties.

Fuel Policy for Commercial Operations

Hard4 min readFlightplanning

Moderately Examined

Why this matters

A clear understanding of commercial fuel policy ensures pilots can make safe, compliant decisions under pressure, especially when facing unexpected weather, delays, or diversions. This knowledge directly impacts flight safety, operational efficiency, and regulatory adherence.

A commercial fuel policy sets the minimum fuel required for a safe commercial flight, balancing regulatory compliance and operational needs. It breaks down fuel into specific segments—trip, contingency, alternate, final reserve, additional, and extra fuel—each with a defined purpose to ensure the aircraft can handle routine and unexpected situations.

Quick Check

Which segments are included in Trip Fuel for a commercial air transport flight according to EASA fuel policy?

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Explanation

Structure of Commercial Fuel Policy

A robust commercial fuel policy is essential for safe and efficient flight operations. The policy divides total fuel into several segments:

Taxi Fuel: Fuel used from engine start to the take-off point.
Trip Fuel: Covers take-off, climb, cruise (including step climbs/descents), descent, approach, and landing at the destination.
Contingency Fuel: Accounts for unforeseen deviations such as weather or ATC delays—calculated as the higher of 5% of trip fuel or enough for 5 minutes at holding speed at 1500 ft above destination.
Alternate Fuel: Required if a destination alternate is planned; includes missed approach, climb, cruise, descent, approach, and landing at the alternate.
Final Reserve Fuel: For turbine aircraft, this is 30 minutes at holding speed at 1500 ft above the aerodrome; for piston aircraft, 45 minutes.
Additional Fuel: Carried if required by specific operational circumstances (e.g., no suitable alternate, isolated destination, or weather concerns).
Extra Fuel: At the captain’s discretion, based on operational judgment.

Fuel Policy Calculation and Requirements

Operators must document their commercial fuel policy and ensure it meets EASA fuel policy rules. The policy must guarantee enough fuel for the planned route, expected contingencies, and regulatory reserves, but not so much that it creates unnecessary weight and cost penalties. The calculation process is systematic, and each segment serves a distinct safety or operational function.

Segments Relevant for Alternates and Contingency

Alternate fuel is only included if a destination alternate is required; it covers the flight from missed approach at the destination to landing at the alternate.
Contingency fuel is always included to buffer against operational uncertainties.

Extra and Additional Fuel

Additional fuel is mandated if the planned reserves might not be sufficient due to special circumstances.
Extra fuel is discretionary, based on the commander’s assessment beyond regulatory minimums.

Understanding the structure and rationale behind each segment is critical for both planning and in-flight decision-making.

The essentials

Key Points

Trip fuel covers take-off, climb, cruise, descent, approach, and landing at destination.

Contingency fuel is the higher of 5% of trip fuel or 5 minutes at 1500 ft holding speed.

Alternate fuel is only required if a destination alternate is planned.

Final reserve fuel is 30 minutes at 1500 ft for turbines, 45 minutes for pistons.

Additional fuel is required for special operational circumstances.

Extra fuel is at the captain's discretion, beyond regulatory minimums.

Carrying excess fuel increases costs and fuel burn, so only the necessary amount should be loaded.

Watch out

Exam Traps & Typical Mistakes

Confusing trip fuel with total fuel—trip fuel does not include reserves or alternate.

Assuming alternate fuel is always required; it's only needed if an alternate is planned.

Forgetting to calculate contingency fuel as the greater of 5% of trip fuel or 5 minutes holding.

Mixing up final reserve requirements for turbine and piston engines.

Believing extra fuel is mandatory; it's discretionary and based on operational judgment.

Test yourself

Example Exam Questions

Question 2Medium

What is the primary reason for carrying contingency fuel in commercial flight planning?

Question 3Medium

When is alternate fuel required in a commercial fuel policy?

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