EASA ATPL Package (former JAA) Mass and Balance

Load and Trim Sheet

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Sample Question: Load and Trim Sheet

Question 9501
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The following data relates to a planned flight of an aeroplane - Dry Operating Mass 60520 kg, Performance limited take-off mass 92750 kg, Performance limited landing mass 72250 kg, Maximum Zero Fuel mass 67530 kg, Fuel on board at take - off - Trip Fuel: 12 500 kg, Contingency and final reserve fuel 2300 kg, Alternate Fuel 1700 kg. Using this data, as appropriate, calculate the maximum traffic load that can be carried.
A
15 730 kg
B
11 730 kg
C
7 730 kg
D
7 010 kg

Understanding the Load and Trim Sheet in Mass and Balance

The Load and Trim Sheet is the practical tool pilots use to ensure that aircraft mass and center of gravity (CG) remain within certified limits from take-off to landing. In ATPL training and exams under EASA aviation regulations, you will often work with the standard JAR FCL twin-jet data set. Key terms include Dry Operating Mass (DOM), Traffic Load (payload plus passengers, baggage, mail), Zero Fuel Mass (ZFM), Take-Off Mass (TOM), and Landing Mass (LM). CG is typically expressed as a percentage of the Mean Aerodynamic Chord (%MAC), and the relationship between mass and CG determines stability, controllability, trim setting, and performance margins. The Load and Trim Sheet consolidates this data and provides a structured, regulation-compliant method to check structural (e.g., Maximum Zero Fuel Mass) and performance-limited masses.

Operationally, the workflow is consistent across aircraft systems and procedures used in the ATPL syllabus: 1) start with the DOM and its basic (dry operating) index, 2) add the Traffic Load by station to get ZFM and a loaded index, then confirm ZFM does not exceed the MZFM, 3) add fuel to determine TOM and verify it is below the performance-limited take-off mass (or MTOM if lower), and 4) subtract trip fuel to find LM and confirm it is below the performance-limited landing mass. At each stage, check the CG against the aircraft’s CG envelope in %MAC. Sample questions reflect this sequence—such as deriving ZFM and the corresponding load index, determining TOM/LM and associated CG positions, and calculating the maximum traffic load given constraints on MZFM, take-off, and landing performance limits.

Many training sheets use an index system that scales moments into convenient units to simplify arithmetic. You will read or compute a loaded index at ZFM by applying index increments for each passenger zone or cargo hold, then convert the resulting index to %MAC using the provided chart. Fuel affects both mass and CG; therefore, fuel index corrections (or a fuel index shift) are applied to move from the ZFM index to the TOM index, and then from TOM to LM as fuel is burned. A negative shift indicates fuel located aft of the datum (or a CG moving forward as fuel burns), while a positive shift indicates the opposite—always follow the sign conventions on the given Load and Trim Sheet. Exam items may ask you to: read an index at a stated DOM and %MAC, apply a specific fuel index correction list to find LM and CG, or use a given fuel index shift from ZFM to determine the take-off CG in %MAC.

Calculating the maximum traffic load brings all checks together. You must respect three independent constraints: 1) ZFM cannot exceed MZFM (so payload is limited by MZFM − DOM), 2) TOM cannot exceed the performance-limited take-off mass (so payload is limited by that take-off limit minus DOM minus block fuel), and 3) LM cannot exceed the performance-limited landing mass (so payload is limited by landing limit minus DOM minus fuel remaining at landing). The governing payload (traffic load) is the smallest value from these constraints. Worked examples in this bank mirror real operational procedures, using the JAR FCL twin-jet sheet to validate both mass and CG throughout the flight, and to confirm an appropriate stabilizer trim setting derived from the take-off %MAC.

What this question bank covers

  • Reading and interpreting the JAR FCL twin-jet Load and Trim Sheet (indices, moments, and %MAC conversion).
  • Building ZFM from DOM and Traffic Load, then adding fuel to obtain TOM and projecting LM.
  • Applying fuel index corrections and fuel index shifts from ZFM to TOM and to LM.
  • Checking CG against the CG envelope and converting between index and %MAC.
  • Compliance with limits: MZFM, performance-limited take-off mass, and performance-limited landing mass.
  • Calculating maximum traffic load given fuel requirements (trip, contingency/final reserve, alternate) and performance constraints.
  • Understanding how mass and balance affect procedures, stability/trim, and performance within the ATPL framework.