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Date:  11-26-2015
Number of Hours:  2.00
Manual Reference:  
Brief Description:  Pressure Test of the Right Fuel Tank

The right fuel tank was set in position on the wing to assure myself that it would actually fit correctly, and it did.

The tank was removed from the wing and returned to one of the assembly saddles for pressure testing. The vent line was connected to an AN fitting with a short piece of ¼” O.D, slightly flared aluminum tube. The ¼” I.D. plastic tube from the water manometer was slipped over the flared tube end, then clamped with a couple of turns of safety wire.

The tank outlet was sealed with an AN fitting with a short piece of 3/8” tubing that was crimped and welded closed. The tank drain fitting was plugged with a Schrader valve.

The filler cap was installed and compressed air carefully introduced through the Schrader valve until the manometer indicated about six-inches. The water level quickly retreated back to zero-inches. When installing the filler cap, I noticed that it closed very easily, so I was fairly confident that the rapid pressure drop was the result of a loose filler cap. I tightened the nut on the back of the cap, and pumped up the tank again. The pressure still dropped off, but at a slower rate. After a few more iterations of tightening the cap nut, it seemed to be holding pressure at about six-inches. I had to leave for Thanksgiving dinner with the family, so I left it in this condition until I returned.

On return to the shop, the manometer had not moved, so the pressure was increased to fourteen inches. A solution of soapy water was prepared and brushed over the rivets, fittings, and filler cap. No bubbles were generated, so the test officially began. I will leave it in this condition for one week; with occasional soapy water testing to be sure no problems develop.
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