CL−605 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 and Figure 302.
(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 discharge indicator (2) is intact. If the green disk is out, it indicates that an
overpressure condition of the oxygen system occurred.
NOTE:
If an overpressure condition of the oxygen system occurred, return the
oxygen cylinder to the authorized facility for servicing.
(3) In the flight compartment, do the steps that follow:
(a) Examine the oxygen indication on the status page of the engine indication and
crew alerting system (EICAS).
(b) Compare the indication on the cylinder pressure gauge with the indication on
the EICAS readout.
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(c)
Compare the indication on the cylinder pressure gauge with the indication on
the oxygen service−door pressure gauge (1).
(d) Make sure that the values on the service panel gauge and the EICAS
indication are within ±50 psi (344 kPa) of the oxygen bottle gauge.
(e) Make sure that the crew oxygen system is fully pressurized (Figure 302).
(4) If the oxygen system is not fully pressurized, do the servicing of the oxygen system
(TASK 12−14−35−614−801).
(5) Make sure that the indications that follow do not show on the status page on the
EICAS:
−
LOW OXY PRESS
−
PAX OXY ON
(6) 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
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2
A
B
C
DMM1214353_001
1
Quantity Check of the Oxygen System − Servicing
Figure 301
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TEMPERATURE CHART
FULLY
PRESSURIZED
LIMIT CURVE
2000
1950
OXYGEN PRESSURE (PSI)
1900
1850
1800
1750
1700
1600
10
0
20
30
40
AMBIENT TEMPERATURE IN OXYGEN CYLINDER AREA (°C)
50
DMM1214353_011
1650
Quantity Check of the Oxygen System − Servicing
Figure 302
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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 12−00−10−480−801
Connect Ground Air Supply
TASK 12−14−35−610−801
Quantity Check of the Oxygen System
TASK 21−00−00−862−801
Pressurize the Air Conditioning System with the
Auxiliary Power Unit (APU)
TASK 35−00−00−910−801
Oxygen Safety Precautions
Tools and Equipment
REFERENCE
GSE 12−30−02
Adaptor, Oxygen System
GSE 24−00−24
Tag, Circuit Breaker
NOTE:
C.
DESIGNATION
Refer to the Illustrated Tool and Equipment Manual to make sure that you use
the correct equipment configuration.
Consumable Materials
REFERENCE
05−038
DESIGNATION
Oxygen, Aviator’s Breathing, Gas
MANUFACTURERS’ REFERENCE
AND/OR SPECIFICATION
MIL−O−27210 Type 1
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CL−605 AIRCRAFT MAINTENANCE MANUAL − PART II
D.
Job Set−Up
CAUTION:
BEFORE YOU REPLENISH THE OXYGEN SYSTEM, MAKE SURE THE
AMBIENT TEMPERATURE IS NOT ABOVE 45 °C. IF THIS OCCURS,
OXYGEN CYLINDER CAN BECOME TOO HOT AND CAUSE DAMAGE
TO UNIT.
(1) Measure the cabin temperature. If the cabin temperature is above 45°C, cool down
the cabin temperature below 45°C using the external ground air supply unit or the
APU.
NOTE:
−
The cabin temperature can be monitored with the cabin temperature
readout on the EICAS multi−function display (MFD).
Connect the ground air supply and push in the L and R PACK switch/light
(TASK 12−00−10−480−801).
or
−
Pressurize the air conditioning system with the auxiliary power unit (APU)
(TASK 21−00−00−862−801).
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.
(2) Make sure that the external ac electrical power is not connected
(TASK 12−00−07−861−802).
(3) Make sure that the BATTERY MASTER switch in the flight compartment is set to
OFF.
(4) 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
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(5) Obey all the oxygen safety precautions (TASK 35−00−00−910−801).
(6) Open the oxygen refill connection door (212BR).
E.
Procedure
Refer to Figure 303.
WARNING:
MAKE SURE THAT HANDS AND CLOTHES OF OPERATING
PERSONNEL AND ALL EQUIPMENT, PLUMBING AND FITTINGS
USED IN OXYGEN CHARGING ARE COMPLETELY CLEAN OF OIL,
GREASE AND SOLVENTS - THESE MAY GET ON FIRE INSTANTLY
OR EXPLODE WHEN IN CONTACT WITH HIGH PRESSURE OXYGEN.
TO KEEP THE OXYGEN SYSTEM FREE FROM CONTAMINATION,
THE FILLER VALVE SHALL BE CAPPED AT ALL TIMES, EXCEPT
WHEN CONNECTED TO THE CHARGING CART.
CAUTION:
THE OXYGEN PRESSURE IN THE CYLINDER MUST NOT BE LESS
THAN 50 PSI (345 KPA) AT ANY TIME. IF THIS OCCURS, THE
OXYGEN CYLINDER MUST BE REMOVED AND SENT BACK TO THE
MANUFACTURER TO BE PURGED.
(1) Make sure that each masks are correctly stowed and that the regulators are set
to N.
(2) Remove the dust cap (1).
(3) Install the oxygen system adaptor on the oxygen filler valve (2).
(4) Connect the filler line of the oxygen cart to the oxygen system adaptor.
CAUTION:
MAKE SURE THAT THE OXYGEN SYSTEM PRESSURE IS NOT MORE
THAN 1850 PSI (12755 KPA) AT 70 °F (21 °C). IF THE OXYGEN
SYSTEM PRESSURE IS MORE, IT CAN CAUSE DAMAGE TO THE
SYSTEM.
(5) Charge the oxygen cylinder at a rate not more than 200 psi/min (1378.96 kpa/min)
until the oxygen cylinder is fully charged as per servicing placard and oxygen
pressure gauge (3).
NOTE:
Make sure to allow a cool down period of 30 to 45 minutes, to make sure
that the oxygen system is fully charged.
(6) Close the supply valve on the oxygen servicing cart to OFF.
(7) Disconnect the servicing cart and oxygen system adaptor from the aircraft.
(8) Immediately install the dust cap (1) on the oxygen filler valve.
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(9) 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
(10) Do a quantity check of the oxygen system (TASK 12−14−35−610−801).
(11) 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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CL−605 AIRCRAFT MAINTENANCE MANUAL − PART II
3
2
1
DMM1214353_002
3
Servicing of the Oxygen System − Servicing
Figure 303
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