Wrap the cell in wrapping paper, UU-P-268, MIL-P-17667, grade A barrier material. MIL-B-121, or
polyethylene sheeting, L-P-378, and pack the wrapped cell in a fiberboard box and close box by any suitable means.
When boxes cannot be obtained, the fuel cells may be stored for a short period of time on a
specially constructed rack which will adequately support the cells. Cells may also be
temporarily stored with only the interior dunnage in place; however, these cells cannot be
Mark the fuel cell in accordance with MIL-STD-129. If the fuel cell is temporarily stored and not
boxed, the same information will be placed on a tag and the tag securely fastened to the cell.
Store cells in a cool, dry area, free from drafts, dust, and ozone, and out of direct sunlight or direct
contact with the ground.
Stack crated cells on widest side of crate, never on end, and not to the extent that crushing of lowest
crate will result.
Arrange cells in storage to ensure use of oldest units first.
Depreservation. The following procedures should be used to depreserve fuel cells:
To prevent damage to fuel cells, remove all sharp objects from pockets and wear covers over
Remove all access panels needed to inspect the inside of the fuel cell.
To prevent asphyxiation from fuel, oil and alcohol fumes, you must wear protective clothing,
i.e., an apron, a respirator, a face shield and rubber gloves. Use an air compressor to
continuously pump air into the tank when personnel are in the tank. Ground the air hose to
the tank. Assign a person to monitor the person in the tank in the event he is overcome by
Inspect the inside of the fuel cell for fungus contamination.
If fungus is present, clean the contaminated cell as follows:
Mix 70 percent ethyl alcohol, denatured, grade Ill, O-E-760, NSN 6810-00-201-0907, with 30 percent water
for a cleaning agent.
Wipe the complete interior of the cell. Use a clean lint free cloth, CCC-C-46A, NSN 7920-00-292-9204.
Spray the inside of the fuel cell with approximately 10 gallons of fuel. For type fuel refer to the
applicable aircraft manual.
Drain the flushing fuel and install the cell. Check for leaks using the instructions in the applicable
Testing Fuel Systems and Tanks/Cells for Leaks. Leak test methods, classification of leaks, and approved
testing fluids are explained below. Leak source, path, and exit should always be considered. Figures 2-9 through 2-13
show various leak paths.
Methods. The following paragraphs describe detecting and locating leaks.
Introduction. Dyed fuel may be used for static leak detection of JP-4 fuel cells and complete fuel
systems. In-flight tests to detect leaks, which cannot be detected by static or engine runup test may be used. However,
the use of in-flight tests requires special approval of the maintenance officer.
Preparation of dye solution. The quantities of liquid dye to be used and the mixing ratios are as
specified in table 2-7.