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Thread sealant primer, PN 7471 (Loctite)
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Thread sealant, PN 569 (Loctite)
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Hose adapter (1/2 in. male acme to ¼ in. female flare)
3.2.3.1.
system/component being leak checked (refer to aircraft maintenance manual).
3.2.3.2.
fittings, etc. to the system components.
3.2.3.3.
3.2.3.4.
power, technician must pull and collar applicable circuit breakers.
CAUTION: HIGH PRESSURE HOSE (RED) IS CONNECTED TO PORT MARKED "D" AND THE LOW
PRESSURE HOSE (BLUE) IS CONNECTED TO THE SERVICE PORT MARKED "S". INCORRECT
CONNECTION COULD RESULT IN MANIFOLD DAMAGE AND/OR INCORRECT PRESSURE READINGS.
3.2.3.5.
compressor.
3.2.3.6.
3.2.3.7.
connect fittings to minimize refrigerant loss. To install quick-connect, push on firmly until
locked (a "clicking" sound is heard). Hold the grip ring and pull to remove quick- connect
fittings.
3.2.3.8.
NOTE: An adapter is required to connect yellow charging hose to the nitrogen source.
CAUTION: APPLY NITROGEN PRESSURE SLOWLY DURING THIS PROCEDURE OR DAMAGE TO
SYSTEM COULD RESULT.
CAUTION: DO NOT EXCEED 200 PSIG NITROGEN PRESSURE DURING PROCEDURE OR DAMAGE TO
EXPANSION VALVE WILL RESULT.
3.2.3.9.
3.2.3.10.
gradually until a pressure of 200 psig is achieved. Allow time for system pressure to
equalize across expansion valve and note final system pressure.
CAUTION: DO NOT USE ANY LEAK DYE IN R-134A SYSTEM OR DAMAGE TO SYSTEM MAY RESULT.
CAUTION: DO NOT OVER TIGHTEN PLUMBING CONNECTIONS. STRIPPED THREADS OR CRACKED
FLARES MAY RESULT.
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Remove, if required, all panels, doors, shrouds, etc., to gain access to
Remove, if required, any enclosures or access doors to expose all tubing, hoses,
Verify all plumbing connections are tight.
Verify that power is removed from aircraft. If it is not practical to remove aircraft
Remove service port caps from the A/C system. Service ports are located on the
Close all manifold gauge valves and verify hose connections are tight.
Connect R-134A refrigerant charging manifold. R-134A service gauges contain quick-
Connect yellow charging hose to a regulated dry nitrogen source
Slowly regulate nitrogen source to a pressure of 200 PSIG maximum.
Slowly open high pressure (red) manifold valve and allow system pressure to increase
Original Release
12037 N Highway 99
Seminole, OK 74868
Phone (405) 382-0731
www.enviro-ok.com
passenger
www.safran‐
ATA 21‐00‐60
‐solutions.com
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