Cargo service airplanes: Increased zero fuel and landing weights

This regulation allows cargo operators to fly certain vintage airplanes (DC-6, DC-7, and Lockheed Constellation models certificated before 1956) at higher zero fuel weights and landing weights than originally approved—but only for cargo operations.

The increases are limited: zero fuel weight can go up by no more than 5%, and landing weight can increase by the same amount in pounds. The FAA must approve each increase after finding it won't significantly weaken the structure, increase fatigue failure risk, or compromise flutter and vibration characteristics.

Operators must follow manufacturer-approved special inspection procedures and update the Airplane Flight Manual with new limitations. The airplanes must still meet passenger-carrying performance requirements even though they're flying cargo. If an airplane later returns to passenger service, it needs another special inspection before carrying passengers again.

This provides operational flexibility for aging cargo aircraft while maintaining safety margins.

*This is a plain-English summary for study only. The official 14 CFR text on this page is controlling — always read the current regulation and consult a CFI.*