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:

Gross-weight operations significantly degrade aircraft performance, particularly during takeoff and climb, often necessitating a "maximum operational weight" below the certified MGTOW due to environmental factors like density altitude and runway conditions.
For general aviation (Part 91) pilots, flying above the certified Maximum Gross Takeoff Weight (MGTOW) is unsafe, unprofessional, and exposes unsuspecting passengers to undue risk, despite specific legal exceptions for certain commercial operations or ferry flights.
Unlike gross weight, Center of Gravity (CG) limits have no built-in conservatism and are absolute; adhering strictly to these limits is critical for maintaining aircraft controllability and stability.

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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.