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28-10-00 Page 28-14 Issued: April 1, 1997
The cells to be repaired should be placed on a well-lighted table. Maintain natural contours, if possible, while repairing. Prevent contact with sharp edges, corners, dirty floors or other surfaces. Repair area must be well-ventilated. Do not stack cells. Inspect cavities and insure cleanliness prior to installing any cell.
2. When storing cells, observe the following rules:
A.  Fold cells smoothly and lightly as possible with a minimum number of folds. Place protective wadding between folds.
B.  Wrap cell in moisture-proof paper and place it in a suitable container. Do not crowd cell in container, use wadding to prevent movement.
C.  Stack boxed cells to allow access to oldest cells first. Do not allow stacks to crush bottom boxes. Leave cells in boxes until used.
D.  Storage area must be dry, 70° F, and free of exposure to sunlight, dirt and damage.
E.  Used cells must be cleaned with soap and warm water prior to storage. Dry, and box as outlined above.
REPAIR OF FUEL CELLS.
— WARNING — THE USER IS RESPONSIBLE FOR REFERRING TO THE APPLICABLE VENDOR PUBLICATION(S) WHEN SERVICING OR INSPECTING VENDOR EQUIPMENT INSTALLED IN PIPER AIRCRAFT. (SEE INTRODUCTION, PAGE 5.)
Procedures for the maintenance, repair and “quick cure” repair of fuel cells constructed of LORAL or GOODYEAR VITHANE. material, should be referenced to the applicable vendor publication (see VENDOR PUBLICATIONS page 5, Introduction). There are two methods by which these repairs may be accomplished. One method is by heat cure, the other is air cure. The end result of either repair is a neat, permanent repair. The heat repair allows the cell to be cured and ready for reinstallation in two hours while the air cure method requires that the cell not be moved for 72 hours during the air cure period.
— Note —
Air cure repairs to be made at room temperature at approximately 75°F. For each 10° drop in temperature add 20 hours cure time. For instance if room temperature reads 65°F, air cure for 92 hours instead of 72 hours.
28-10-00 Page 28-15 Issued: April 1, 1997
TESTING FUEL CELLS.
Either of the following test procedures may be used to detect leaks in the bladder cells:
1. Soap Suds Test.
A.  Attach test plates to all fittings.
B.  Inflate the cell with air to a pressure of 1/4 psi MAXIMUM.
C.  Apply a soap and water solution to all repaired areas and any areas suspected of leakage. Bubbles will appear at any point where leakage occurs.
D.  After test. remove all plates and wipe soap residue from the exterior of the cell.
2. Chemical Test.
A.  Attach test plates to all fitting openings except one.
B.  Make up a phenolphthalein solution as follows: Add 40 grams phenolphthalein crystals in 1/2 gallon of ethyl alcohol. mix, then add 1/2 gallon of water.
C.  Pour ammonia on an absorbent cloth in the ratio of 3ml per cubic foot of cell capacity. Place the saturated cloth inside the cell and install remaining test plate.
D.  Innate the cell with air to a pressure of 1/4 psi MAXIMUM, and maintain pressure for fifteen minutes.
E.  Soak a large white cloth in the phenolphthalein solution, wring it out thoroughly, and spread it smoothly on the outer surface of the cell. Press the cloth down to insure detection of minute leaks.
F.  Check the cloth for red spots which will indicate a leak. Mark any leaks found and move the cloth to a new location. Repeat this procedure until the entire exterior surface of the cell has been covered. If red spots appear on the cloth. they may be removed by re-soaking the cloth in the solution.
G.  The solution and test cloth are .satisfactory only as long as they remain clean. Indicator solution that is not in immediate use should be stored in a closed rustproof container to prevent evaporation and deterioration.
After the test. remove all plates and test equipment. Allow the cell to air out.
In conducting either text outlined above, the cell need not be confined by a cage or jig, providing the 1/4 psi pressure is not exceeded.
— Note —
The chemical test is the more sensitive and preferred test.

28-10-00 Page 28-16 Issued: April 1, 1997
LOCKING FUEL CAP.
DISASSEMBLY OF LOCKING FUEL CAP.
1.
Remove two screws on back of fuel cap.

2.
Remove screw which secures pawl to back of key lock assembly.

3.
Remove pawl from back of key lock assembly.

4.
Remove nut which secures key lock to cover.

5.
Slide lock, gasket and spring over back of key lock.

6.
Key lock may be removed by pushing key lock through cover.

ASSEMBLY OF LOCKING FUEL CAP.
1.
Insert key lock through cover making certain that O-ring is installed under head of key lock.
　
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