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4 Tanks per side
Gmas,
Well, yes, and no. We did open up the bottom inspection panels and have isolated the "probable" area of leakage to the inboard tank, aft inboard side, and I surmise because of the stains that can be seen with a mirror and flashlight directed via one of the rib holes forward of the hose connections to the fuselage that the leak is somewhere above the middle of the tank seem.
I haven't proceeded further as I was waiting to hear from you on the screws for the upper panel and boom cover. The screw numbers and related washers/spacers come up blank on both CessnaParts.Com and IWantCessnaParts.Com. The hardware numbers are:
Figure 4A - Sheet 2 of 2 - Boom support & Wing Structure Assy.
Item 15 - AN509-8R7 QTY: 22-each
Item 16 - NAS221-11 QTY: 16-each (These are the High Shear)
Figure 7A Wing Skins & Stringers Installation
Item 40 - AN509-10R7 QTY: 18-each
Item 41 - AN509-10R10 QTY: 19-each
Item 41A - NAS221-10 QTY: 01-each
Item 41B - S290D1032 QTY: 04-each (Washer)
Item 42 - AN509-10R16 QTY: 12-each
Item 44 - 1422041-2 QTY: 44-each (Spacer)
Also, if it turns out that the leak is not coming from the aft upper inspection hole gasket, and there's a crack, obviously the tank will have to be removed... which then raises the issue of availability of "S51-8" hoses which also come up blank on the parts avails.
Intend to put the jacks under the wings tomorrow and level the plane, and with the nose strut depressed, shore up the right boom. I would think that'll be sufficient for stabilizing before removing the upper inboard panel. BTW, this is a '77 P337.
We'll be calling Cessna Propeller A/C Support in the morning and see if I can get a detailed drawing on the inboard and specs as to individual tank capacities. Not really necessary, but good to know. BTW, mine has 4-tanks per side, not three, and while the total capacity is 75 gallons between the four tanks (actually a little less with the R/STOL, as my usable is 71.5 per side due to a smaller outboard tank with this installation), with the dihedral of the wing and 38-gallons showing on the Penny Cap indicator the outboard tank at the filler cap is dry. I was just trying to figure out how much of that 38 gallons was in the inboard tank and the immediate outboard tanks... because of the dihedral it obviously wouldn't be 19 gallons each of two tanks or 12.6 between three of the outer tanks. With the inboard being the largest, I was just trying to get an idea of where the leak might be located on the upper part of the tank, either the side or top and knowing how much of this 38 gallons is in the inboard would give a little clue.
SkyKing
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