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

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.

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 Indications	C	-	0	May be inoperative provided: Oxygen Service Panel Pressure Gauges are operative and checked before every takeoff, and Crew Oxygen Off and Passenger Oxygen Off messages are not displayed on the CAS prior to every takeoff.	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.