TB 1-1520-238-20-119
(a) Inspect inside the fire bottle cartridge housing vertical outlet ports for evidence of pitting
corrosion or evaporation residue.
(b) If pitting or evaporation residue is found -- clean inside the port IAW paragraph 9b.
(3) If no pitting or residual is noted reinstall the tube assemblies part number 7--311620503
and part number 7--311620504 IAW paragraph 12.39, TM 1--1520--238--23 for the AH--64A, and the IETM
for the AH--64D and reinstall the check valves IAW TM--1--1520--238--23, para 12.42 for the AH--64A and
the IETM for the AH--64D.
b. Recurring Inspections -- These inspections will be carried on the DA Form 2408--18 until the
phase maintenance inspection checklists have been updated. ULLS--A units will use this message as
authority to use their 800 inspection numbers for the corrosion inspections of all three fire extinguisher
check valves at phases 2 and 4.
(1) Check Valve -- The inspection for corrosion required IAW para 8a(1) will be completed at
phase inspection numbers 2 and 4 for all three fire extinguisher check valves.
(2) Fire Bottle Outlet Ports -- The inspection of the fire bottle outlet ports required IAW para
8a(2) will be required at phase inspection numbers 2 and 4.
a. Check Valve Cleaning Procedures --
(1) Submerge two way check valve in Turco corrosion resistant fluid, NSN
6850--00--551--9577, for a minimum of 3 minutes. After 3 minutes agitate valve in fluid to remove excess
corrosion and evaporation residue.
(2) If required, use a soft brush to help remove corrosion and evaporation residue.
NOTE
After corrosion has been removed, inspect inside of the valve for
corrosion or pitting, paying special attention to the ball seats and check
ball. If pitting exists in either area, replace IAW para 9c.
(3) After the two way check valve has been cleaned in the Turco corrosion resistant fluid,
flush entire valve with clean water and allow to air dry.
(4) Use of compressed air to expedite dry time is permitted.
(5) Apply corrosion prevention compound (CPC), fluid film, NSN 8030--01--387--1131, to
inside of two way check valve.
(a) Cap one end of valve and fill inside of valve with CPC, fluid film.
(b) Cap the two other ports and rotate valve to ensure a complete coating of the entire internal
section of the valve.
(c) When the entire internal section of the valve has been coated, drain excess fluid from the
valve and allow to air dry for 20 minutes.
(6) Reinstall the check valve IAW TM 1--1520--238--23, para 12.42 for the AH--64A and the
IETM for the AH--64D.
b. Fire Bottle Outlet Ports Cleaning Procedures --
(1) Clean with cotton swab dipped in Turco corrosion resistant fluid.
(2) Swab vertical outlet ports with cotton swabs soaked in water. Allow to air dry.
(3) Apply CPC, fluid film, to inside of vertical outlet ports with cotton swab, and allow to air
dry.
(4) Reinstall tube assemblies part number 7--311620503 and part number 7--311620504 IAW
para 12.39, TM 1--1520--238--23 for the AH--64A, and the IETM for the AH--64D.
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