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Max AUW


trev130eng
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C'mon Flt Eng's and loadmasters. Give me an idea. I thought we were pushing the limit today. 12T of freight and 100 plus pax. (Full Fuel, No externals). Mountains and then overwater flight. Beautiful flying but the pilots and engineers were fighting about the weight. Loadmaster " She will take off". 3 engines? No way. No worries, trust your herc.

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Well, trev

The answer you are looking for is not that simple without more information; such as:

1- The distance from brake release point to the obstacle (mountain). To get three/four engine climb-out flight bath.

2- The pressure altitude-at the time of the mission-not the field elevation.

3- The minimum specified/accepted rate of climb after take-off with three engines.(normally specified by the operators) this will give you the take-off gross weight limited by three engine climb performance

4- Drag index.

5- The ability to perform “spiral†climb is another factor to the whole subject.

You should check your SMP777 to get the accurate answer of “AUWâ€.

In my book it is in (figure 3-10) take-off gross weight limited by three engine climb performance.

And (figure 3-17) climb-out flight bath three/four engine.

But to give you an idea based on the information given by you:

1- Take-off factor 2.5

2- Temp deviation +25⁰C

3- Pressure altitude 7,230 ft. (estimated standard)

4- 500 ft (estimated minimum accepted rate of climb after take-off with three engines)

Based on the above your take-off gross weight limited by three engine climb performance should not exceed 135,000 lb. (plan for the worse and hope for the best)

The distance from brake release point to the “obstacle†is essential requirement to get the climb-out flight bath three/four engine, (if unable to do “spiral†climb or to turn to avoid the obstacles.)

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