Lockheed C-130J Speed Decrease

I’m currently flying a Lockheed C-130J at FL250 with 134,103lbs of weight; the speed of the aircraft is decreasing despite 100% power. Why is this?

Is your Airspeed (IAS) decreasing or your GroundSpeed (GS) descreasing?

Both are decreasing.

You are most likely still too heavy to be flying at that altitude. You should see an improvement if you descend to around FL220.

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I’ve descended to that altitude but I need 99% to maintain constant speed.

If you are now maintaining the speed then you should be fine if not you can always descend more.

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Ok then, thanks

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