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May 19, 2019 | Original article
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** ON A/C ALL 35-10-00 - CREW OXYGEN ** ON A/C 201-250, 252-300, 351-364, 366-400, 451-650, 702-750 35-10-00 PB 001 CONF 00 - CREW OXYGEN - DESCRIPTION AND OPERATION 1. General A. Purpose and Function. The flight crew oxygen system gives the protection for 4 flight crew members in these conditions: · Loss of cabin pressure altitude · Smoke or toxic gas release. B. Flight Conditions. -Normal conditions: A/C normal maximum flight altitude = 41000 feet A/C normal maximum cabin altitude = 8000 feet C. Crew System Organization The system has three sections, which are as follows: - Crew oxygen storage ( Ref. 35-11) - Crew oxygen distribution (Ref. 35-12) - Crew oxygen control and indicating (Ref. 35-13) D. Flight Crew Installation ** ON A/C 201-250, 252-300, 351-364, 366-400, 451-505, 507-650, 702-750 (Ref. Fig. Fwd Cockpit Installation SHEET 1) ** ON A/C 201-250, 252-300, 351-364, 366-400, 451-510, 551-650, 702-750 (Ref. Fig. Aft Cockpit Installation SHEET 1) ** ON A/C 201-250, 252-300, 351-364, 366-400, 451-650, 702-750 The oxygen cockpit installation has: · One OXYGEN/CREW SUPPLY pushbutton switch located on the overhead panel 211VU · Four oxygen stowage box assemblies, which contain the full-face quick donning mask · The ECAM system, which gives the information about oxygen status to crew members. E. Avionics Compartment Installation (Ref. Fig. Avionics Cockpit Installation SHEET 1) The basic oxygen system in avionics compartment consists of : -one oxygen cylinder with valve assembly. -one pressure regulator/transmitter -one low-press solenoid supply valve -one distribution manifold on which are connected :both R and L distribution circuits , a test port for leakage test, a pressure switch. NOTE: These items of equipment are located between frames 4 and 7 and protected by a cover secured with quick-release fasteners. To help the maintenance personnel , this cover is kept open by a mechanical holding system. F. Aircraft Skin One overboard discharge indicator, which is a part of the safety system, is installed in the right-forward part of the aircraft skin (between frames 6 and 7). 2. System Description ** ON A/C 201-250, 252-300, 351-364, 366-400, 451-505, 507-510, 551-650, 702-750 (Ref. Fig. Oxygen-General Description SHEET 1) ** ON A/C 201-250, 252-300, 351-364, 366-400, 451-650, 702-750 A. Crew Oxygen Storage(Ref. 35-11) The flight crew oxygen system is supplied from a high-pressure oxygen cylinder(s). A pressure regulator(s)/transmitter(s) is/are directly connected to the head of the cylinder(s). This/These cylinder(s) is/are located in the avionics compartment between frames 4 and 7. It/They is/are installed in a bracket(s) and secured by two metallic clamps. B. Crew Oxygen Distribution (Ref. 35-12) The oxygen is supplied to the flight crew stations through a distribution circuit. This circuit is as follows : - a low-pressure solenoid supply valve and distribution manifold - low-pressure stainless-steel distribution pipes - flexible supply hoses used to facilitate maintenance and ensure the flexible connection between rigid equipments. - mask stowage boxes with full-face quick donning masks. C. Crew Oxygen Control and Indicating (Ref. 35-13) · The OXYGEN/CREW SUPPLY pushbutton switch located on the overhead panel 211VU controls the LP solenoid supply valves (opening or closing) · The monitoring and indicating system shows the oxygen status to the crew members. This information is displayed on the DOOR/OXY page of the ECAM system display. 3. Operation/Control and Indicating A. Operation The HP oxygen supplied by the oxygen cylinder(s) is available as soon as the manual valve(s) is/are open (closed position only for replacement or isolation of the cylinder). The pressure regulator(s)/transmitter(s) decreases this high pressure to low pressure for the downstream circuit and distribution equipment. The activation of the OXYGEN/CREW SUPPLY pushbutton switch electrically controls the LP solenoid valve position and allows the oxygen supply of the LP circuit. Through two distribution lines, the oxygen is sent to the oxygen stowage boxes which contain each a full-face quick donning mask. B. Control and Indicating ** ON A/C 201-250, 252-300, 351-364, 366-400, 451-505, 507-650, 702-750 (Ref. Fig. Electrical Diagram SHEET 1) ** ON A/C 201-250, 252-300, 351-364, 366-400, 451-650, 702-750 (1) Oxygen HP Indicating Indication of the HP oxygen cylinder(s) is/are given by: - direct reading on the pressure gage of the cylinder valve assembly. - on the ECAM system in the cockpit (the pressure regulator/transmitter sends this information through the SDAC 1 and 2 ) (2) Oxygen LP Indicating A pressure switch installed on the distribution manifold gives an abnormal LP information on the ECAM system (through the SDAC 1 and 2 ). (3) Oxygen crew supply control The activation of the LP solenoid supply valve which open the distribution circuit is made by action on the OXYGEN/CREW P/BSW. This switch position is monitored : - on the head of the OXYGEN/CREW P/BSW (illumination of the OFF legend in white when the oxygen supply is switched off). - on ECAM system (through the SDAC 1 and 2) OXY legend in amber when the pushbutton switch is in the OFF position. ** ON A/C 201-250, 252-300, 351-364, 366-400, 451-505, 507-650, 702-750 Figure 35-10-00-11950-00-C / SHEET 1/1 - Fwd Cockpit Installation ** ON A/C 201-250, 252-300, 351-364, 366-400, 451-510, 551-650, 702-750 Figure 35-10-00-12000-00-A / SHEET 1/1 - Aft Cockpit Installation ** ON A/C 201-250, 252-300, 351-364, 366-400, 451-650, 702-750 Figure 35-10-00-12050-00-A / SHEET 1/1 - Avionics Cockpit Installation ** ON A/C 201-250, 252-300, 351-364, 366-400, 451-505, 507-510, 551-650, 702-750 Figure 35-10-00-13600-00-E / SHEET 1/1 - Oxygen-General Description ** ON A/C 201-250, 252-300, 351-364, 366-400, 451-505, 507-650, 702-750 Figure 35-10-00-15000-00-C / SHEET 1/1 - Electrical Diagram ** ON A/C 201-250, 252-300, 351-364, 366-400, 451-650, 702-750 35-10-00 PB 401 CONF 00 - CREW OXYGEN - DEACTIVATION/REACTIVATION TASK 35-10-00-040-803-A Check of High Pressure of the Crew Oxygen Cylinder WARNING: KEEP ALL HYDROCARBONS (FUELS, LUBRICANTS, ETC.) AWAY FROM ALL SOURCES OF OXYGEN. OXYGEN BECOMES EXPLOSIVE WHEN IT TOUCHES HYDROCARBONS. WARNING: MAKE SURE THAT YOUR HANDS AND ALL THE TOOLS ARE CLEAN TO PREVENT CONTAMINATION OF THE OXYGEN SYSTEM. IF CONTAMINANTS GO INTO THE SYSTEM, OXYGEN CAN BECOME EXPLOSIVE. CAUTION: MAKE SURE THAT THE ITEMS IN THE "FIXTURES, TOOLS, TEST AND SUPPORT EQUIPMENT" PARAGRAPH ARE APPLICABLE TO YOUR AIRCRAFT. REFER TO THE APPLICABLE SUBTASKS. Task Summary MMEL or CDL Ref Access Test Specific Tools Mhr E/T Nb Men MMEL 35-07-01A YES NO NO 00.2 00.2 1 1. Reason for the Job MMEL 35-07-01A Crew OXY High Pressure Indication on the DOOR/OXY SD page 2 Job Set-up Information 2 Job Set-up Information A. Fixtures, Tools, Test and Support Equipment REFERENCE QTY DESIGNATION No specific AR THERMOMETER No specific 1 WARNING NOTICE(S) B. Work Zones and Access Panels ZONE/ACCESS ZONE DESCRIPTION 120 AVIONICS COMPARTMENT 811 C. Referenced Information REFERENCE DESIGNATION (Ref. 24-42-00-861-801-A). Energize the Ground Service Network (Ref. 24-42-00-862-801-A). De-energize the Ground Service Network (Ref. 35-00-00-860-801-A). Special Precautions when Working on a Gaseous Oxygen System ** ON A/C 201-250, 252-300, 351-364, 366-400, 451-505, 507-650, 702-750 (Ref. 35-11-41-000-801-A). Removal of the Oxygen Cylinder/Valve Assy (Ref. 35-11-41-400-801-A). Installation of the Oxygen Cylinder/Valve Assy ** ON A/C 201-250, 252-300, 351-364, 366-400, 451-650, 702-750 (Ref. 52-41-00-010-801-A). Opening of Avionics-Compartment Access Door 811 (Ref. 52-41-00-410-801-A). Closing of Avionics-Compartment Access Door 811 3. Job Set-up Subtask 35-10-00-861-053-A A. Aircraft Maintenance Configuration (1) Obey the special precautions when you do work on a gaseous oxygen system (Ref. AMM TASK 35-00-00-860-801) . (2) Energize the ground service network (Ref. AMM TASK 24-42-00-861-801) . (3) On the overhead panel, on the OXYGEN section of panel 211VU: (a) Put the WARNING NOTICE(S) in position to tell persons not to operate the crew oxygen system. Subtask 35-10-00-010-060-A B. Get Access (1) Open access door 811 (Ref. AMM TASK 52-41-00-010-801) . (2) In the avionics compartment, open the oxygen box. (3) Make sure that the avionics compartment and the cockpit have a good airflow. 4. Procedure ** ON A/C 201-250, 252-300, 351-364, 366-400, 451-505, 507-650, 702-750 Subtask 35-10-00-220-052-A A. Check of the High Pressure of the Crew Oxygen Cylinder (1) Do a check of the oxygen pressure on the direct-reading pressure gage of the oxygen cylinder 5750HT: (a) Record the oxygen pressure of the crew oxygen-storage cylinder 5750HT. (2) Measure the Outside Air Temperature (OAT) and the temperature in the cockpit with a THERMOMETER . (3) Calculate the reference temperature with this formula: OAT + COCKPIT TEMPERATURE ------------------------- 2 (4) Record the reference temperature. (5) Send the recorded values to the crew. (6) If the pressure recorded in 4.A.(1)(a) is less than the minimum oxygen pressure found in the Flight Crew Operating Manual (FCOM) table: (a) Replace the oxygen cylinder (Ref. AMM TASK 35-11-41-000-801) and (Ref. AMM TASK 35-11-41-400-801) . ** ON A/C 201-250, 252-300, 351-364, 366-400, 451-650, 702-750 5. Close-up Subtask 35-10-00-410-059-A A. Close Access (1) Make an applicable entry in the logbook. (2) Close the oxygen box. (3) Close the access door 811 (Ref. AMM TASK 52-41-00-410-801) . (4) On the overhead panel, on the OXYGEN section of panel 211VU: (a) Remove the warning notice(s). Subtask 35-10-00-862-054-A B. Put the aircraft back to its initial configuration. (1) De-energize the ground service network (Ref. AMM TASK 24-42-00-862-801) . TASK 35-10-00-040-807-A Loss of REGUL LO PR Indication WARNING: KEEP ALL HYDROCARBONS (FUELS, LUBRICANTS, ETC.) AWAY FROM ALL SOURCES OF OXYGEN. OXYGEN BECOMES EXPLOSIVE WHEN IT TOUCHES HYDROCARBONS. WARNING: MAKE SURE THAT YOUR HANDS AND ALL THE TOOLS ARE CLEAN TO PREVENT CONTAMINATION OF THE OXYGEN SYSTEM. IF CONTAMINANTS GO INTO THE SYSTEM, OXYGEN CAN BECOME EXPLOSIVE. CAUTION: MAKE SURE THAT THE ITEMS IN THE "FIXTURES, TOOLS, TEST AND SUPPORT EQUIPMENT" PARAGRAPH ARE APPLICABLE TO YOUR AIRCRAFT. REFER TO THE APPLICABLE SUBTASKS. Task Summary MMEL or CDL Ref Access Test Specific Tools Mhr E/T Nb Men MMEL 35-07-02A YES NO YES 01.0 01.0 1 1. Reason for the Job MMEL 35-07-02A Crew Oxygen REGUL LO PR Indication on the DOOR/OXY SD page Incorrect Crew Oxygen REGUL LO PR indication on DOOR/OXY page: REGUL LO PR is continuously displayed when oxygen pressure is not low, or REGUL LO PR is not displayed when there is low pressure condition. This task is done to make sure that sufficient oxygen pressure is in the oxygen system before the flight. 2 Job Set-up Information 2 Job Set-up Information A. Fixtures, Tools, Test and Support Equipment REFERENCE QTY DESIGNATION No specific 1 GAGE 20 BAR (290 PSI) - PRESSURE No specific 4 WARNING NOTICE(S) (110111-36) 1 COUPLING - OXYGEN QUICK DISCONNECT (98D35208729001) 1 TOOL-DPRESS, TEST-O2 B. Work Zones and Access Panels ZONE/ACCESS ZONE DESCRIPTION 120 AVIONICS COMPARTMENT 210 CKPT FWD PRESSURE BHD TO CKPT PARTITION 811 C. Referenced Information REFERENCE DESIGNATION (Ref. 24-41-00-861-801-A). Energize the Aircraft Electrical Circuits from the External Power A (Ref. 24-41-00-861-801-A-01). Energize the Aircraft Electrical Circuits from the APU (APU Started with APU BAT) (Ref. 24-41-00-861-801-A-03). Energize the Aircraft Electrical Circuits from the External Power A and B (Ref. 24-41-00-861-801-A-04). Energize the Aircraft Electrical Circuits from the APU (APU started with External power A) (Ref. 24-41-00-861-801-A-05). Energize the Aircraft Electrical Circuits from the External Power B (Ref. 24-41-00-862-801-A). De-energize the Aircraft Electrical Circuits from the External Power A (Ref. 24-41-00-862-801-A-01). De-energize the Aircraft Electrical Circuits from the APU (Ref. 24-41-00-862-801-A-03). De-energize the Aircraft Electrical Circuits from the External Power A and B (Ref. 24-41-00-862-801-A-04). De-energize the Aircraft Electrical Circuits from the External Power B (Ref. 35-00-00-860-801-A). Special Precautions when Working on a Gaseous Oxygen System (Ref. 52-41-00-010-801-A). Opening of Avionics-Compartment Access Door 811 (Ref. 52-41-00-410-801-A). Closing of Avionics-Compartment Access Door 811 3. Job Set-up Subtask 35-10-00-860-068-A A. Aircraft Maintenance Configuration (1) Obey the special precautions when you do work on a gaseous oxygen system (Ref. AMM TASK 35-00-00-860-801) . (2) Energize the aircraft electrical circuits (Ref. AMM TASK 24-41-00-861-801) . (3) On the overhead panel, on the OXYGEN section of panel 211VU: (a) Put the WARNING NOTICE(S) in position to tell persons not to operate the crew oxygen system. (b) Make sure that the OFF legend on the CREW SUPPLY pushbutton switch is on. Subtask 35-10-00-865-067-A B. Get access to the avionics compartment. Then make sure that this(these) circuit breaker(s) is (are) closed: PANEL DESIGNATION FIN LOCATION 742VU CREW OXY CTL 4HT L73 Subtask 35-10-00-010-066-A C. Get Access (1) Open access door 811 (Ref. AMM TASK 52-41-00-010-801) . (2) In the avionics compartment, open the cover of the oxygen compartment. (3) Make sure that the avionics compartment and the cockpit have a good airflow. CAUTION: VERIFY THAT THE VALVE IS BEING OPERATED CORRECTLY BY REFERENCING THE "ON/OFF" DECAL ON TOP OF THE VALVE.