EXAMPLE OF G550 OXYGEN SYSTEM: OXYGEN REQUIRED FOR DE-PRESSURIZATION AND CONTINUED CRUISE
-
CRUISE
ALTITUDE (FT)
|
TIME
(HR:MIN)
|
REQUIRED BOTTLE PRESSURE AT DISPATCH
|
NUMBER OF PASSENGERS
|
0
|
1
|
2
|
4
|
6
|
8
|
10
|
15
|
19
|
25000
|
1:00
|
413
|
447
|
482
|
551
|
621
|
690
|
759
|
932
|
1071
|
1:30
|
508
|
560
|
613
|
717
|
822
|
927
|
1031
|
1293
|
1502
|
2:00
|
603
|
673
|
743
|
883
|
1023
|
1163
|
1303
|
1653
|
1933
|
2:30
|
699
|
786
|
874
|
1049
|
1225
|
1400
|
1575
|
2014
|
|
3:00
|
794
|
899
|
1005
|
1215
|
1426
|
1637
|
1847
|
|
|
3:30
|
890
|
1013
|
1136
|
1382
|
1628
|
1874
|
|
|
|
4:00
|
985
|
1126
|
1266
|
1548
|
1829
|
|
|
|
|
4:30
|
1080
|
1239
|
1397
|
1714
|
2030
|
|
|
|
|
5:00
|
1176
|
1352
|
1528
|
1880
|
|
|
|
|
|
20000
|
1:00
|
369
|
397
|
424
|
479
|
534
|
589
|
644
|
782
|
892
|
1:30
|
440
|
481
|
522
|
605
|
687
|
770
|
852
|
1058
|
1223
|
2:00
|
510
|
565
|
620
|
730
|
840
|
950
|
1060
|
1334
|
1554
|
2:30
|
581
|
650
|
718
|
855
|
993
|
1130
|
1267
|
1611
|
1885
|
3:00
|
651
|
734
|
816
|
981
|
1146
|
1310
|
1475
|
1887
|
|
3:30
|
722
|
818
|
914
|
1106
|
1298
|
1491
|
1683
|
2163
|
|
4:00
|
792
|
902
|
1012
|
1232
|
1451
|
1671
|
1890
|
|
|
4:30
|
863
|
986
|
1110
|
1357
|
1604
|
1851
|
|
|
|
5:00
|
933
|
1070
|
1208
|
1482
|
1757
|
2031
|
|
|
|
15000
|
1:00
|
342
|
355
|
369
|
397
|
425
|
453
|
481
|
550
|
606
|
1:30
|
396
|
416
|
436
|
476
|
517
|
557
|
597
|
698
|
778
|
2:00
|
450
|
477
|
503
|
556
|
608
|
661
|
713
|
845
|
950
|
2:30
|
505
|
537
|
570
|
635
|
700
|
765
|
830
|
992
|
1122
|
3:00
|
559
|
598
|
637
|
714
|
791
|
869
|
946
|
1140
|
1295
|
3:30
|
614
|
659
|
703
|
793
|
883
|
973
|
1063
|
1287
|
1467
|
4:00
|
668
|
719
|
770
|
873
|
975
|
1077
|
1179
|
1435
|
1639
|
4:30
|
722
|
780
|
837
|
952
|
1066
|
1181
|
1296
|
1582
|
1811
|
5:00
|
777
|
840
|
904
|
1031
|
1158
|
1285
|
1412
|
1730
|
1984
|
Based on pressure reading at 70ºF.
Includes oxygen for three crewmembers breathing 100% oxygen for emergency descent plus two minutes. Normal dillution for remainder of flight.
Increase oxygen required by 37 PSIG for each crewmember on oxygen at/above FL410 for each 60 minutes.
Maximum system pressure is 1800 PSIG. Values in excess of 1800 are shown for interpolation purposes only.
Appendix 1 to JAR-OPS 1.770
|
Oxygen – Minimum Requirements for Supplemental Oxygen for Pressurised Aeroplanes (Note 1)
|
(a)
|
(b)
|
SUPPLY FOR:
|
DURATION AND CABIN PRESSURE ALTITUDE
| -
All occupants of flight deck seats on flight deck duty
|
Entire flight time when the cabin pressure altitude exceeds 13,000 ft and entire flight time when the cabin pressure altitude exceeds 10,000 ft but does not exceed 13,000 ft after the first 30 minutes at those altitude, but in no case less than:
-
30 minutes for aeroplanes certificated to fly at altitudes not exceeding 25,000 ft (Note 2)
-
2 hours for aeroplanes certificated to fly at altitude more than 25,000 ft (Note 3)
| -
All required cabin crew members
|
Entire flight time when cabin pressure altitude exceeds 13,000 but not less than 30 minutes (Note 2), and entire flight time when cabin pressure altitude is greater than 10,000 ft but does not exceed 13,000 ft after the first 30 minutes at these altitudes.
| -
100% of passengers (Note 5)
|
Entire flight time when the cabin pressure altitude exceeds 15,000 ft but in no case less than 10 minutes. (Note 4)
| -
30% of passengers (Note 5)
|
Entire flight time when the cabin pressure altitude exceeds 14,000 ft but does not exceed 15,000 ft.
| -
10% of passengers (Note 5)
|
Entire flight time when the cabin pressure altitude exceeds 10,000 ft but does not exceed 14,000 ft after the first 30 minutes at these altitudes.
|
Note 1: The supply provided must take account of the cabin pressure altitude and descent profile for the routes concerned.
Note 2: The required minimum supply is that quantity of oxygen necessary for a constant rate of descent from the aeroplane’s maximum certificated operating altitude to 10,000 ft in 10 minutes and followed by 20 minutes at 10,000 ft.
Note 3: The required minimum supply is that quantity of oxygen necessary for a constant rate of descent from the aeroplane’s maximum certificated operating altitude to 10,000 ft in 10 minutes and followed by 110 minutes at 10,000 ft. The oxygen required in JAR-OPS 1.780(a)(1) may be included in determining the supply required.
Note 4: The required minimum supply is that quantity of oxygen necessary for a constant rate of descent from the aeroplane’s maximum certificated operating altitude to 15,000 ft in 10 minutes.
Note 5: For the purpose of this table ‘passengers’ means passengers actually carried and includes infants.
3. Oxygen Service
Panel Pressure
Gauges
|
D
|
2
|
0
|
May be inoperative provided the associated cockpit gauge is operative and monitored.
|
None required.
|
None required.
|
An Inoperative Placard will be placed on Oxygen Service Panel Gauges and will be noted on ADLS.
|
4. Portable Oxygen
*** Dispensing Units
(Bottle and Mask)
|
B
|
-
|
-
|
Any in excess of those required by Operating Requirements may be inoperative or missing provided required distribution is maintained throughout airplane.
NOTE: Any bottle not properly serviced is considered inoperative and should be removed.
|
None required.
|
None required.
|
An Inoperative Placard will be displayed in a prominent position to be seen by flight crew and will be noted on ADLS.
|
5. Oxygen Supply
Warning Systems
|
C
|
2
|
0
|
May be inoperative provided associated cockpit gauge is operative and monitored.
|
None required.
|
None required.
|
An Inoperative Placard will be displayed in a prominent position to be seen by flight crew and will be noted on ADLS.
|
6. Protective Breathing
*** Equipment (PBE)
|
D
|
-
|
-
|
(M) Any in excess of that required may be inoperative or missing provided the inoperative PBE is placarded inoperative, removed from the installed location and placed out of sight so it cannot be mistaken for a functional unit.
|
Maintenance will ensure the inoperative PBE is removed from its installed location or placed out of sight.
Flight crew may accomplish this task if properly qualified and authorised.
|
None required.
|
An Inoperative Placard will be displayed in a prominent position to be seen by flight crew and will be noted on ADLS.
|
7. Electronic Equipment
*** Rack Oxygen Pressure
Gauges
|
D
|
-
|
0
|
May be inoperative provided cockpit gauges are operative.
|
None required.
|
None required.
|
An Inoperative Placard will be displayed in a prominent position to be seen by flight crew and will be noted on ADLS.
|
8. Cockpit Oxygen
Pressure Gauges
|
C
|
-
|
0
|
May be inoperative provided electronic equipment rack gauges are installed and operative.
|
None required.
|
None required.
|
An Inoperative Placard will be displayed in a prominent position to be seen by flight crew and will be noted on ADLS.
|
9. First Aid Oxygen
|
D
|
-
|
-
|
(M) Any bottle in excess of those required may be inoperative provided the inoperative equipment is placarded inoperative, removed from the installed location (if portable) and placed out of sight so it cannot be mistaken for a functional unit.
|
Maintenance will ensure the inoperative bottle is removed from its installed location (if portable) or placed out of sight.
Flight crew may accomplish this task if properly qualified and authorised.
|
None required.
|
An Inoperative Placard will be displayed in a prominent position to be seen by flight crew and will be noted on ADLS.
|
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