CL−604 AIRCRAFT MAINTENANCE MANUAL − PART II
REPLENISHING, OXYGEN SYSTEM - SERVICING
1.
TASK 12−14−35−610−801
Quantity Check of the Oxygen System
A.
Reference Information
REFERENCE
B.
DESIGNATION
TASK 12−00−07−861−801
Connect and Energize External AC Power
TASK 12−00−07−861−802
Remove External AC Power
TASK 12−14−35−614−801
Servicing of the Oxygen System
Job Set−Up
(1) Connect and energize the external ac power (TASK 12−00−07−861−801).
(2) Open the oxygen service door that follows:
ACCESS
212BR
C.
DESIGNATION
Door, Oxygen Refill Connection
Procedure
Refer to Figure 301.
(1) At the oxygen refill connection door, examine the pressure gauge (1). Make note of
the value shown on the pressure gauge (1).
(2) Examine the overboard discharge indicator (2). Make sure that the green disc on
the indicator (2) is not broken. If the green disc is broken, there is too much
pressure in the crew oxygen system.
NOTE:
Aircraft with two oxygen cylinders have two overboard discharge
indicators.
(3) In the flight compartment, do the steps that follow:
(a) Examine the oxygen quantity indication on the status page of the engine
indication and crew alerting system (EICAS).
(b) Compare the indication on the pressure gauge (1) with that of the EICAS
readout. Make sure that the values are less than 100 psi (689.50 kPa) of each
other.
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(c)
Use the table that follows to make sure that the crew oxygen system is fully
pressurized:
CREW OXYGEN SYSTEM
AMBIENT TEMPERATURE
FULLY PRESSURIZED
100°F (37°C)
1990 psi (13.720 kPa)
80°F (27°C)
1990 psi (13.100 kPa)
60°F (16°C)
1805 psi (12.445kPa)
40°F (4°C)
1710 psi (11.790 kPa)
20°F (−7°C)
1620 psi (11.170 kPa)
0°F (−18°C)
1530 psi (10.549 kPa)
−20°F (−29°C)
1435 psi (9894 kPa)
−40°F (−40°C)
1340 psi (9239 kPa)
(d) If the crew oxygen system is not fully pressurized, do the servicing of the crew
oxygen system (TASK 12−14−35−614−801).
(4) Remove the external ac power (TASK 12−00−07−861−802).
D.
Close Out
(1) Remove all tools, equipment, and unwanted materials from the work area.
(2) Close the oxygen service door that follows:
ACCESS
212BR
DESIGNATION
Door Oxygen Refill Connection
EFFECTIVITY: ALL
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2
B
A
A
1
NOTE
B
Aircraft with two oxygen
cylinders have two overboard
discharge indicators.
LMM1214353_001
C
Quantity Check of the Crew Oxygen System − Servicing
Figure 301
EFFECTIVITY: ALL
12−14−35
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CL−604 AIRCRAFT MAINTENANCE MANUAL − PART II
2.
TASK 12−14−35−614−801
Servicing of the Oxygen System
A.
Reference Information
REFERENCE
B.
DESIGNATION
TASK 12−00−07−861−802
Remove External AC Power
TASK 12−14−35−610−801
Quantity Check of the Oxygen System
TASK 35−00−00−910−801
Oxygen Safety Precautions
TASK 35−11−01−000−801
Removal of Oxygen Cylinder and Regulator
Assembly
TASK 35−11−01−400−801
Installation of Oxygen Cylinder and Regulator
Assembly
Tools and Equipment
REFERENCE
GSE 24−00−24
NOTE:
C.
Tag, Circuit Breaker
Refer to the Illustrated Tool and Equipment Manual to make sure that you use
the correct equipment configuration.
Consumable Materials
REFERENCE
05−038
D.
DESIGNATION
DESIGNATION
Oxygen, Aviator’s Breathing, Gas
MANUFACTURERS’ REFERENCE
AND/OR SPECIFICATION
MIL−O−27210 Type 1
Job Set−Up
WARNING:
BEFORE YOU DO MAINTENANCE ON THE OXYGEN SYSTEM, MAKE
SURE THAT THE EXTERNAL ELECTRICAL POWER IS NOT
CONNECTED. MAKE SURE THAT ALL PRIMARY CIRCUIT BREAKERS
FOR THE AIRCRAFT BATTERIES ARE OPEN AND SAFETIED. IF YOU
ENERGIZE THE ELECTRICAL POWER SOURCE, OR A SPARK
OCCURS NEAR AN OXYGEN LEAK, A FIRE/EXPLOSION CAN
OCCUR. THIS CAN CAUSE INJURY TO PERSONS, AND DAMAGE TO
EQUIPMENT.
(1) Make sure that the external ac electrical power is not connected
(TASK 12−00−07−861−802).
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CL−604 AIRCRAFT MAINTENANCE MANUAL − PART II
(2) Make sure that the BATTERY MASTER switch in the flight compartment is set to
OFF.
(3) Open, safety and tag the circuit breakers that follow:
LOCATION
CB NUMBER
CB NAME
ZONE
CBP−2
M3
BATT BUS POWER SENSE
222
CBP−2
M4
RCCB CONT MAIN BATT
222
CBP−2
M5
RCCB CONT APU BATT
222
CBP−2
M7
FEED 1 BATT BUS
222
CBP−2
M9
FEED 2 BATT BUS
222
(4) Obey all the oxygen safety precautions (TASK 35−00−00−910−801).
(5) Open the oxygen refill connection door (212BR).
E.
Procedure
Refer to Figure 302.
WARNING:
DO NOT LET OIL, GREASE OR SOLVENTS GET ON YOUR HANDS,
CLOTHING OR THE EQUIPMENT USED TO DO WORK ON THE
OXYGEN SYSTEM. IF OXYGEN TOUCHES GREASE, OIL OR
SOLVENTS, THEY CAN START TO BURN.
(1) Do the servicing of the oxygen system as follows:
(a) Use an oxygen mask and set the regulator valve to N.
(b) Remove the dust cap (3) from the oxygen filler valve (4).
(c)
Connect the filler line of the oxygen cart to the oxygen filler valve (4).
(d) Examine the pressure gauge (2). If the pressure indication is less than 50 PSI,
replace the crew oxygen cylinder (TASK 35−11−01−000−801 and TASK
35−11−01−400−801).
NOTE:
Before you send the oxygen cylinder to be purged, open the valve
slightly and listen for a hiss. Use a piece of paper to determine that
there is a positive pressure in the cylinder. If you find a positive
pressure, the oxygen cylinder can be replenished, re−installed and
the oxygen system purged.
EFFECTIVITY: ALL
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CL−604 AIRCRAFT MAINTENANCE MANUAL − PART II
WARNING:
MAKE SURE THAT YOU DO NOT PUT TO MUCH PRESSURE
INTO THE OXYGEN CYLINDER. FULL PRESSURE IS
DEPENDENT ON AMBIENT TEMPERATURE. IF YOU PUT TOO
MUCH PRESSURE INTO THE OXYGEN CYLINDER, THE GREEN
DISC ON THE OVERBOARD DISCHARGE INDICATOR(S) (1) WILL
BREAK.
(e) Slowly pressurize the crew oxygen cylinder (at a rate of 200 psi (1 379 kPa)
maximum per minute) until the crew oxygen cylinder is fully charged as per
placard.
(f)
When the pressure in the crew oxygen cylinder is at the fully charged level,
decrease the supply pressure from the oxygen cart to zero.
(g) Slowly loosen the filler line at the oxygen filler valve (4) to release the pressure
out of the filler line.
(h) When the pressure is released from the filler line, disconnect the filler line from
the oxygen filler valve (4).
(i)
Install the dust cap (3) on the oxygen filler valve (4).
(2) Remove the tags and close the circuit breakers that follow:
LOCATION
CB NUMBER
CB NAME
ZONE
CBP−2
M3
BATT BUS POWER SENSE
222
CBP−2
M4
RCCB CONT MAIN BATT
222
CBP−2
M5
RCCB CONT APU BATT
222
CBP−2
M7
FEED 1 BATT BUS
222
CBP−2
M9
FEED 2 BATT BUS
222
(3) Do a quantity check of the oxygen system (TASK 12−14−35−610−801).
(4) Close the oxygen refill connection door (212BR).
F.
Close Out
(1) Remove all tools, equipment, and unwanted materials from the work area.
EFFECTIVITY: ALL
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2
B
A
A
1
NOTE
B
Aircraft with two oxygen
cylinders have two overboard
discharge indicators.
LMM1214353_002
C
Servicing of the Oxygen System − Servicing
Figure 302
EFFECTIVITY: ALL
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