Max-Gross Weight Ops

My brother slipped me a piece of paper on which he’d jotted three numbers: 260, 240 and 180. If you haven’t guessed, they’re weights. Add me and the load is 860 pounds well-marbled (not 170-pound), above-average Americans. Add full tanks, 56 gallons of fuel and we would approach gross weight. I had yet to add backpacks, fly-fishing gear and food for a week, but after that I’d have to start trading fuel for payload, and worry about CG as well. Welcome to the world of gross-weight ops.

Mike Hart

Tuesday, August 19, 2014 at 12:00 AM ET

Verified

Key Takeaways:

Operating at or near an aircraft's maximum gross takeoff weight (MGTOW) severely degrades takeoff and climb performance, particularly in hot, high-altitude, or short-field conditions, often surprising pilots who underestimate the impact.
While MGTOW is a certification standard, it can be legally exceeded in specific circumstances (e.g., for certain commercial operations or via supplemental type certificates), but the practical "maximum operational weight" is often lower due to environmental factors and runway conditions.
Unlike gross weight, which can have some flexibility, an aircraft's Center of Gravity (CG) limits are critical, non-negotiable, and strictly determined by flight tests with no built-in conservatism, making adherence essential for stability and control.

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For me, the biggest concern in gross-weight operations is an unsafe CG, poor takeoff/climb performance—especially on hot days, at high altitudes and short fields—followed by structural issues (hard landings). If you fly a twin, I suspect single-engine performance could trump any of the above.