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APPENDIX A
TM 0766B1-14/1
WARNING
Four pressure relief holes are drilled in the threaded portion of the filler cap approximately three
threads before the cap is released. If pressure is heard escaping through these holes while the
cap is being removed, stop removal until all pressure has escaped; otherwise serious injury to
personnel could result.
(4)
Measure depth of fluid remaining in AFFF tank with dipstick provided with the extinguisher (figure 3-1).
The number of inches from the top of the fill collar to the remaining fluid is used to determine the gallons of AFFF
concentrate required to obtain a 6% AFFF solution when the tank is filled. See Table 3-6.
(5)
Pour required amount of AFFF concentrate into tank.
(6)
Fill AFFF tank with water to within 4-1/2 inches of top of filler neck.
NOTE
Use of a hose, if available, held against tank bottom while filling will aid in Fixing the solution and
prevent excessive foaming.
(7)
Install cap and tighten hand tight.
(8)
Return system valves to normal or ready status, paragraph 2-12.
c.
Servicing Nitrogen Cylinders. Replace either nitrogen cylinder when cylinder pressure is below 1700 psi,
after comparing reading with table 3-7.
(1)
With cylinder valve closed and system depressurized, remove outlet adapter (1, figure 3-3) from outlet
of quick-opening valve.
(2)
Loosen retaining bolts (2) and remove cylinder stop plate (3). It is not necessary to remove the bolts
completely.
(3)
Remove cylinder by pulling straight outward then up as the cylinder clears the slides on the cylinder
support plates.
(4)
Install shipping cap (4) and return cylinder to field maintenance facility for recharging or replacement.
(5)
Install new cylinder and secure with stop plate. Tighten retaining bolts securely.
(6)
Remove shipping cap, check cylinder gage to ensure cylinder is fully charged. Compare with table 3-
5. Momentarily open cylinder valve a small amount to clear any dirt from valve outlet.
(7)
Connect outlet adapter and high pressure hose to valve outlet and tighten securely.
A 3-14
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