Effects of Cargo Shifting in Flight

The Effects of Cargo Shifting in Flight

When cargo is not properly restrained, it can move during flight due to turbulence, manoeuvring, or changes in aircraft attitude. Even a small shift in heavy cargo can cause the aircraft's centre of gravity (CG) to move outside its permissible range. This can result in:

• Unstable Aircraft Handling: A forward CG makes the aircraft nose-heavy, increasing control forces and potentially making rotation and flare difficult. An aft CG reduces longitudinal stability, increasing the risk of pitch-up and stall.
• Structural Damage: Unsecured cargo can impact the aircraft structure, damaging floors, bulkheads, or critical systems such as hydraulics and controls.
• Exceeding Structural Limits: Shifting mass may cause localised overloading, exceeding maximum running load limits for cargo compartments or floors.

Cargo Securing and Mass & Balance Procedures

To prevent cargo movement, all loads must be properly restrained using approved nets, straps, or container systems. The loading manifest must be checked against the actual cargo position, and visual inspections of unit load devices (ULDs) are required before departure. Any last-minute changes must be documented and recalculated to ensure the CG remains within limits.

Calculating the Impact of Cargo Shift

If cargo is loaded incorrectly or shifts in flight, the new CG position must be calculated. The formula used is:

Mass Shifted / Total Mass = CG Change / Distance Moved

This allows you to determine how much mass movement will cause a specific CG change, or vice versa. If the new CG is outside allowable limits, corrective action is required before flight.

Types of Cargo and Load Distribution

Containerised and palletised cargo offer advantages in securing and distributing loads evenly, reducing the risk of movement. Bulk cargo requires careful manual restraint. Always ensure that compartment and floor load limits are not exceeded by calculating linear load distribution.

Operational Best Practices

• Supervise all loading with qualified personnel.
• Verify that cargo is loaded as per documentation.
• Ensure all securing devices are in place and serviceable.
• Recalculate mass and balance after any changes.
• Understand the consequences of cargo movement for safe flight operations.