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preventf orwardm ovemenot f the legs.
At the endo f the catapulst troke( approximate3ly5
incheso f seatr avel),t hem ultipurposien itiatorl anyards
becometa ut andw ithdraw the firing unit sears.T his
routesg asp ressureto the electronics equencesrt art
switchesb, eginnings equencetirm ing to the pitot doploymenmt
echanismasn dt o the rocketm otor,f iring it.
Thee lectronics equencedre terminetsh ep roperm odeo f
seato perationb asedo n altitudea nda irspeed
2.38.4 Seat Operation After Ejection. Postejection
operation(F O-16a ndF O-17)b @ns at the endo f catapult
travel when the rocket motor tires and the start
switchesa ctuateb. r normaol perationth, e electronisce -
quencerselectstJreoperatingmodedopendingonaJtitude
anda mmeedA. barostatirce leasuen it urovidesa na utomaticb
&up for electronioc.p erationF.o urs econdasf ter
the seatf tig handlei s pulled,t he barostaticu nit is
armedp ermittingp arachutdee ploymenatn dJ ramesms-
Jesse as determind by the bamstat setting if the so
quence~ha sn ot functionedA. s a fur&r backupt,h e
crmmemberc anm anuallyt ire the pamchuted eploymentr
ocketa ndr eleaseth e Jmmeslso cksb y usingt he
mand ovemidhea ndle.
2.38.4.1 Electronic Sequencing. In all modes,
followings tarts witcha ctuationt,h ep itot headse xtend,
environmentasel nsingfo r modes electiocno mmences,
andt he seatd rogueis deployedon its tJrre+poinbt ridle
to stabilizea nds low the seat.w hile this is occur&,
the sequencesre lectso neo f the five operatingm odes
(FO-16 and FO-17) from its lookup tables based on
senseadl titudea nda irspeedT. hem odesa red escribed
as follows:
1. Mode1 - This ist he low-altitudel,o w-a&peed
mode, Thed rogueb ridler eleaseosp erateim me
diatelx the parachuted eploymenrto cket6 rest o
extracta ndd eployt hep arachutea; ndt heh arness
locksa rer aleasedT,h eo ccupanits h eldi n thes oat
momentarilby y the stickerc lips.
2. Modes2 ,3, and4 - Thesem odesa mf or low to
medimna ltitudesa t airspeedsin excesso f 350
knots.T hed rogueis ratainedto slowa nds tabilize
the seatT. hen,t hep arachutdee ploymenrot cketi s
fired to extract and deployt he parachutet,h e
dmgueb ridler eleasetsh a droguaa; ndt heJ mrness
locksa rer eleasedT.h eo ccupanits h eldi n thes eat
momomarilby y the stickerc lips.
3. Mode5 - Thismodeiss&otedathighaltitude.
Thel owerd rogueb ridler eleaseosp erator,e tainingthe
drogue by the upper attach point only.
Environmentasl ensingre starts,a nd the seati s
allowedto fall to 18,000fe etb eforet he sequence
continuesT.h ent het qrperd roguere leasoep erates,
freeing the drogue, the parachuted eployment
rocketi s fued to extracta ndd eployth ep arachute,
andt he harnessJ ocksa rer eleasedT. Jveo ccupant
ism omentarilhy eldi n thes eabt y the& i&r clips.
In all modes,p arachuted eploymenltif ts the crewmember
and survivel kit from the seat, pulling the
stickers trapsfr om the clips.
2.38.4.2 Barostatlc Release. To ensure that the
parachuteisdeployedandthehamesslocksarereleased.
theb arostatirce leasau nit,c onsistinogf a barostaat nda
cartridgep, rovidasa ni ndependenatu tomatibc ackupto
the electronics equencer.Thecartridgeis6mdonaof
three ways: electricallyb y the sequenceart a praset
altitude of 18,000 feet (FO-16 and FO-17), me&anitally
by the bamstaticre leaseu nit between1 4,000a nd
16,000f eet; or me&anicallyb y gasp mssureti om a
4-second&layca rtridgew hent hem amraoJv arrideh andleispuJled.
Afterthetimedelay,gaspressuroisapplied
to the bamstatc artridget iring mechanismA.b ovet he
ORIGINAL 2.250
barostat altitude setting, the mechanism is restricted
from moving; at or below the altitude it is &se to move
and fire the cartridge if it has not aheady been hind
electrically. When fd the barostat cartridge provides
gasp ressureto tire the parachuted eploymentr ocket and
operate the harness lock release.
2.38.4.3 Manual Override. Afterejectioqthemanual
override handle provides a further backup to both the
electronic sequencera nd the barostatic release.P ulling
the handle fires a cartridget hat provides gasp ressuret o
tire the parachute deployment rocket and operate the
harness lock release.
2.39 LIGHTING SYSTEM
2.39.1 Exterior Lights. The exterior lights include
position lights, formation lights, anticollision lights, a
taxi light, approach lights, and an air refueling probe
light. All exterior lighting controls, except for the air
refueling probe light and approach lights, are located on
the MASTER LIGHT panel on the pilot right console.
　
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