Is this fuel plate Clipper

[PA-16]

[Gilbert Pierce]

Yes it is.

[andya]

Is the statement of keeping the fuselage tank full til wing is empty
for CG reasons, but I'm guessing its to cover if passengers or cargo is in the back seat??

[PA-16]

Thanks. Andy, Gilbert probably knows for sure but I am venturing a guess that its because the engine only feeds through the fuselage tank.. at least thats how the J3 I flew was that had more than one tank and a nose tank still in it.

[Gilbert Pierce]

The fuel valve selects which tank you draw from. When I had a nose tank I didn’t much worry about the placard.
After a fill-up I would takeoff on wing and then switch to the nose to insure good fuel and flow. Might leave it there for awhile. No CG issue.
(c) Adjacent to fuel valve:
(1) "Fuselage tank must be full until wing tank is empty."

[dgapilot]

Likely for CG issues, the same as the limitation “if three persons are on board both front seats must be occupied”. Funny thing is if you run the numbers for most airplanes it’s pretty hard to go past the aft limit.

Of course the fuel placard doesn’t stay if you have dual wing tanks. I still haven’t figured how you would legally use the Utility category with dual wing tanks given the limitation of “wing tank must not be filled more than 1/4 full. I suppose you could do 1/4 in each and maybe be legal. I’d be interested in seeing a Flight Manual Supplement for the wing tank STC.


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[Gilbert Pierce]

Does the Stewart STC for O320 and both wing tanks Flight Manual Supplement address this Steve?
Mine was done with a field approval; there is no mention of the Utility catagory.