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2.31 OXYGEN SYSTEM
Breathingo xygenis providedt o eachc rewmember
by the OBOGS.A backupo xygens ystemp rovidesa
supplyo f gaseouosx ygens ufficientf or a maximumranged
escenitn the evento f a failureo f the OBOGS.
In addition,e mergencyo xygeni s availableto each
crewmembethr rougha high-pressurgea, seouosx ygen
bottlel ocatedin the ejections eats urvivakl it.
2.31.1 On-Board Oxygen Generating System.
The OBOGSp rovides9 5percentp ure pressurea- ed
temperature-regulateodx ygent o eachc rewmember.
Thes ystemin cludeas no xygenc oncentratoar,n oxygen
monitor,a ndt wo regulatorsC. ontrolsa ndi ndicatorstb r
the OBOGS are shown in Figure 2-80.
The oxygenc oncentratoirs in the right sideo f the
fuselagea djacentto andb eneathth e forwardc ockpit.
Filtereda nd cooledE CS servicea ir is directedto tire
oxygen concentrator when ON is selected on tke
OBOGS master switch on the pilot cockpit panel. A
moleculasr ievei n .thec oncentratorr emoves the nikogen
t?omt he compresseadi r, leavinga breathingg as
equivalenitn concentrationto 95percento xygena t
34,000fe et.T heo xygenc oncentratorer ceives1 15-WC
motorp owerf rom the pilot ac essentiablu sN o. 1 and
heater power from the ac right main bus. OBOGS
28-Vdcc ontrolp oweri s providedb y essentiadl c bus
No. 1 via the OBOGS CONTK circuit breaker.
The oxygenm onitori s on the pilot right consoleI.t
constantlmy onitor3th e oxygenc oncentratooru tputt o
ensure a sufiicientc oncentratioonf oxygeni s being
generatedW. hent he monitord etectsa no xygenp artial
pressurele sst han 182m m Hg, it generateas n alarm
signatlh at illumiaatetsh eO BOGSc autionli ghts,s huts
off outputT omt hec onceauutoarn de nabletsh eb ackup
oxygens ystemT. hec oncentratoarn dt he monitorc ontinuet
o fonctiona sl onga st he OBOGSs witchi s in the
ON positionT. hem onitorw ill automaticallsyh iftb ack
to the OBOGSs upplys ourcew heni t detectsa dequate
concentratooru tput
NAVAIR OWl4AADl
Powerto the monitoris providedb y 28V dc OBOGS
contropl owert ?omt hee ssentiadlc busN o. 1 whent he
OBOGSm astesr witchi s in the ONp ositionT. hes ensor
in the monitori sh eatedfo r propero perationU. poni nitial
selectiono f the OBOGSm asters witcht o ON, the
OBOGSispoweredand8uwtioningbutthemonitorwi~
not be accuratelyd etectingo xygenc oncentratiounn til
thes ensoirs warmedu p. Thisc ant akeu p to 2 minute%
dependingo n the ambiente mperatureT. he OBOGS
lightw ill not be illuminatedd uringt he warmupp eriod.
Thepilotmaytestoperationofthemonitorviathepressto-
ventT ESTb utton.T he buttona ctuateas valvet hat
mustb e heldf or up to 1 minutet o vento xygens ensor.
Laborakxyt estingh asd emonstratetdh at the test can
normallyb e completedin approximately1 5 seconds.
Onceven~themonitorwillsenseinsufticientoxyg~
illuminatingth e cockpitc autionli ghtsa nds hiftingt he
oxygens upplys ourceto BOS.T hem onitorw ill automaticallyshiftbacktoOBOGSoperationandextlnguish
the cautionli ght afterr eleasoef theT ESTb utton.T esting
hasd emonstratethdi s occursw ithin5 to 7 seconds,
but may take up to 20 seconds.
p&iii--I
Thea ircreww ill not havea nyi ndicationo f
a tkihne of the monitor. If the aircrew suspects
the onset of hypoxia at any time, immediately
select BACKUP. The monitor
maybetestedoncetlleaiKxa~hasto
a cabina ltitudeo f 10,000fe et or lessa nd
the ON position on the OBOGS master
switch has been reselected.
Ther egulatorsa rec heatm ountedp, ressmud emand
typethroughwhichpressure-andtempemtum-mgulated
oxygenisprovidedtoeachcrewmParne.s surebreathing
is activateda bove3 4,000-fooct abina ltitude.
When the OBOGS master switch is on, hltered,
coolede ngineb leeda iris dire&d to theo xygenc oncentratorwhereamolecularsieverthenitmgenfmm
the compresseadir , leavinga breathingg asc onsisting
of 95-percenotx ygenT heo xygenm onitorc heckss ysterno
perationto ensureth at a sufticientc oncentration
of oxygenis b eingg eneratedp rovidesa cockpitin dication,
andbringsthebaehtpgaseoussupplyonliueas
requimdA teatb uttono n the monitore nabletsh ep ilot
to verifyt hatt hem onitora ndt heb ackupo xygens ystem
arefunctioning.Whenpre-w&theOBOGSadvisory
lighti lhtminateisn dicatingth e systemis in backnpT. he
oxygenc oncentratorre ceives1 15V at 6om pilot ac
essentiabl usN o. 1 and from the ac right main bus,
Contd power and power to the monitor is 28 Vde from
essentialdcbusNo1..
Z-141 ORIGINAL
NAVAIR ill-Fl4AAD1
ypiiq
(PILOT. RIO)
AIRCRAFT WITHOUT
AIRCRAFT WITH
ORIGINAL
Figure Z-80. Oxygen System Controls and Indicators (Sheet 1 of 2)
　
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