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AIR CONDITIONING SYSTEM SHUTOFF AND FLOW REGULATOR VALVE — INSPECTION / CHECK
1. Air Conditioning Shut-off Valve Filter — Inspection
A. Preparation
SPECIAL TOOLS AND TEST EQUIPMENT
Filter tester ............................................................................................................................ See Note
NOTE: See Figure 601 and Step 1.B.(5) for filter tester specifications and setup.
CONSUMABLES
Carbon remover ................................................................................................................ Turco 4181
Solvent ........................................................................................................................... Desoclean 45
Clean water ........................................................................................................................... Standard
Filter (396460-3 valve) .................................................................................................. 337-549-9001
Filter (396460-2-1 valve) ....................................................................................................... 111790-5
GSK kit (396460-2-1 valve only) ............................................................ 1159CGSK212077 / 212078
O-ring ................................................................................................................................. S8990-013
(1) Reference
• Air Conditioning Shut-off Valve Filter - Removal / Installation, 21-01-00, Removal /
Installation or Code 212061
(2) Aircraft Preparation
(a) Prepare aircraft for safe ground maintenance.
(b) Remove filter from air conditioning shut-off valve. See Air Conditioning Shut-off Valve
Filter - Removal / Installation, 21-01-00, Removal / Installation or Code 212061.
B. Procedure
NOTE: Comparing the low relative cost of the filter with the cost of man hours involved in cleaning
and testing a filter, it is suggested that the filter be replaced at each inspection interval.
(1) Inspect retainer, washers and spring removed from valve in Step 1.A.(2)(b). Replace parts as
required.
(2) Inspect plug removed from valve in Step 1.A.(2)(b) for galling or cross threading. Replace plug
as required.
(3) Inspect filter for damage. Replace filter as required.
(4) Clean filter as follows:
WARNING: MANY OF THE MATERIALS SPECIFIED HAVE SIGNIFICANT
OCCUPATIONAL SAFETY, HEALTH OR ENVIRONMENTAL REQUIREMENTS
RELATED TO THEIR USE. MATERIAL SAFETY DATA SHEETS MUST BE
CONSULTED FOR ALL MATERIALS TO DETERMINE THE
MANUFACTURERS RECOMMENDATIONS CONCERNING OCCUPATIONAL
EXPOSURE PRECAUTIONS. IT IS THE SOLE RESPONSIBILITY OF THE
USER TO ENSURE PROTECTION FROM INJURY OR EXPOSURE; SAFE
APPLICATION OF MATERIALS; AND COMPLIANCE WITH ANY FEDERAL,
STATE OR LOCAL REGULATIONS REGARDING THE USE OF ANY OF THE
MATERIALS SPECIFIED.
(a) Soak filter in carbon remover for 24 hours.
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(b) Rinse filter in cold water then air dry filter thoroughly.
(c) Fully immerse filter in solvent and agitate filter in solvent.
(d) Remove filter from solvent and allow filter to air dry.
(5) Install filter in filter test setup similar to that shown in Figure 601 and constructed as follows:
(a) Using 1/4 inch metal tubing, install regulator in line with two AN815-4 nipples.
(b) Install two gages with AN824-4 tees.
(c) Make orifice from AN815-4 union plugged to a depth of 1/8 inch and drilled 0.042 inch
through.
(d) Connect filter to line with quick-coupler (Type 637, Superior Valve and Fitting Co.,
Pittsburgh, Pennsylvania).
(e) Use filtered compressed air at 80°F ±40°F.
(6) Test filter as follows:
(a) With filter installed in filter tester, adjust regulator to apply inlet air pressure of 20 psig at
inlet air pressure gage.
(b) Discard filter if pressure indicated on downstream air pressure gage exceeds 3.5 psig.
(7) Remove filter from filter tester.
C. Follow On
(1) Inspect for presence of foreign objects.
(2) Install cleaned filter or new filter in air conditioning shut-off valve. See Air Conditioning Shut-off
Valve Filter - Removal / Installation, 21-01-00, Removal / Installation or Code 212061.
(3) Record all maintenance actions in accordance with current governing authority.
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1 2 3 4
UNIT BEING
TESTED
AIR IN
1. REGULATOR, INLET 3. ORIFICE (0.042 IN. DIA HOLE X 0.125 IN. LG)
2. GAGE, INLET (0 TO 30 PSIG) 4. GAGE, DOWNSTREAM (0 TO 15 PSIG)
01069C01
Filter Assembly Test Setup
Figure 601
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