CFRN Study Questions and Answers
Updated 2026
WhichMgasMlawMexplainsMwhyMaMpneumothoraxMexpandsMasManMunpressurizedMcabinMa
scends?M-MAnswerMBoyle'sMlaw
RequestMtheMpilotMflyMatMtheMlowest,MsafestMaltitude.
GasesMexpandMatMhigherMaltitudesM-MAnswerMBoyle'sMlaw
WhichMgasMlawMexplainsMwhyMoxygenMtankMpressuresMmayMchangeMbetweenMtakeoffMa
ndMatMaltitudes?M-MAnswerMGay-Lussac'sMLaw
OxygenMtankMpressuresMdecreaseMatMhigherMaltitudeMdueMtoMcoolerMtemperaturesMshrin
kingMgasesM-MAnswerMGay-Lussac'sMLaw
WhichMgasMlawMdepictsMwhyMflightMcrewsMmayMbeMableMtoMtransportManMobeseMpati
entMinManMaircraftMinMwinterMthatMtheyMcouldn'tMtransportMinMwarmerMmonths?M-
MAnswerMCharle'sMLaw
DescribesMhowMcooerMairMisMdenser,MallowingMtheMwingsMtoMcreateMmoreMliftMinMcold
MtemperaturesM-MAnswerMCharle'sMLaw
NightMvisionMdeteriorationMstartsMatMwhatMaltitude?M-
MAnswerMNightMvisionMlossMbeginsMatM5,000MftMinMtheMindifferentMstageMofMhypoxia,
MalongMw/ManMincreaseMrespiratoryMandMheartMrate.
WhatMdoesMhypoxiaMhypoxiaMcause?M-
MAnswerMImpedesMalveolarMgasMexchange.MTheMdecreasedMbarometricMpressureMatMhigh
MaltitudeMcausesMhypoxia,MsoMhypoxiaMhypoxiaMmayMbeMreferredMtoMasMaltitudeMhypo
xia.
AMpatientMw/Memphysema/COPDMmayMexperienceMwhichMtypeMofMhypoxiaMduringMairMt
ransport?M-MAnswerMHypoxic
AMpatientMw/ManMactiveMGIMbleedMmayMexperienceMwhichMtypeMofMhypoxiaMduringMtr
ansport?M-MAnswerMHypemicMhypoxiaM
,(rhymesMw/Manemic,McellularMhypoxiaMlargelyMdueMtoMbloodMlossMorManemia)
PtsMw/McarbonMmonoxideMandMcyanideMexposureMmayMexperienceMwhichMtwoMtypesMo
fMhypoxia?M-MAnswerMHistotoxicMandMHypemic
HistoricMHypoxiaM-
Malcohol,Mcyanide,MandMcarbonMmonoxideMpoisoning,MresultingMinMtheMcellsMinabilityMto
MuseMoxygen.
CyanideMpoisoningMtxM-MAnswerMHydroxycobalamin
IncreaseMinMattitudeMincreasesMorMdecreasesMhumidityMandMtemperatureM-
MAnswerMdecreasesMboth
WhatMinjuriesMareMexpectedMfromMoverpressureMafterManMexplosion?M-
MAnswerMPneumothorax.
OccursMwhenMtheMshockMwaveMtravelsMthroughMtheMairMandMdamagesMtheMgrassMfilled
MorgansMlikeMtheMlunges.MSecondMinjuryMisMfromMflyingMdebris,MthusMpenetratingMinjur
y.M
TertiaryMheadMinjuriesMfromMbeingMthrownMtoMtheMground.
QuaternaryMinjuriesMfromMburns.
UndergarmentsMwornMunderMtheMfireMresistantMflightMsuitMshouldMbeMmadeMofMnatural
MfibersMandMshouldMbeMmadeMofMnaturalMfibers,MhowMmuchMairMspaceMshouldMbeMb
etweenMsuitMandMgarments?M-MAnswerM0.25Minch
WhenMaMhelicopterMlandsMonMaMslopeMorMunevenMterrain,MwhatMisMtheMbestMwayMto
MapproachMandMdepartMtheMaircraft?M-
MAnswerMFromMtheMdownhillMside,MinMaMcrouchedMposition.
HowMdoMyouMmanageManMinMflightMemergency?M-
MAnswerMaviate,Mnavigate,Mcommunicate
TheMprioritiesMareMtoMretainMcontrolMofMtheMaircraft,MchooseMandMappropriateMemerge
ncyMlandingMsite,MthenMreportMtheMemergencyMtoMtheMprogramMcommunicationMcenter.
AnMimpactMthatMexceedsMhowMmanyMG'sMwillMautomaticallyMactivateMtheMemergencyMl
ocatorMtransmitter?M-MAnswerM4
, WhichMuniversalMdistressMfrequencyMtransmitsMaMdigitalMsignalMincludingMGPSMlocationM
afterMELTMactivation?M-MAnswerM406MHz
TheMpilotMfailsMtoMcheckMtheMpowerMduringMliftMoffMandMtheMhelicopterMimpactsMthe
MgroundMandMsmokeMfillsMtheMcockpit.MWhatMisMtheMnurse'sMpriorityMaction?M-
MAnswerMExitMtheMaircraftMandMmeetMatMaMpre-
designatedMlocationM(12Mo'clockMposition)
WhichMinterventionMshouldMbeMperformedMfirstMforMaMpatientMinMresp.MdistressMdueMt
oMaMsimpleMpneumothorax?M-MAnswerMChestMTube
InsertionMshouldMbeMperformedMpriorMtoMbipap,MbipapMcanMpushMaMsimpleMpneumotho
raxMtoMaMtensionMpneumothorax.
InterpretMABG:MpHM7.25,MPaO2M40,MHCO3M15M-MAnswerMmetabolicMacidosis
MetabolicMAcidosisMconditions:M-
MAnswerMketoacidosis,Msalicylate,Mmethanol,MethyleneMglycolMingestion,MrenalMfailure,Mdi
arrhea,MandMlacticMacidosisMfromMshock.
InterpretMABG:MpHM7.33,MPaO2M32,MHCO3M18M-
MAnswerMPartialMcompensatedMmetabolicMacidosis
WhichMinductionMagentMisMpreferredMinMheadMtraumaMsinceMitMhasMlittleMtoMnoMeffec
tMonMMAPMandMdecreasesMICP?M-MAnswerMEtomidate
drawbacksMofMetomidateMisMthatMitMdoesn'tMprovideManalgesiaMandMpossibleMadrenalMs
uppression.
WhatMisMtheMamountMofMbloodMinMtheMventriclesMatMendMdiastole?M-
MAnswerMPreload
WhatMlawMdescribesMhowMincreasingMpreloadMincreasesMtheMventricleMstretchMandMsubs
equentMcontraction?M-MAnswerMSterlingsMlaw
WhatMisMtheMresistanceMtheMventriclesMmustMovercomeMtoMejectMbloodMintoMtheMpul
monaryMandMsystemicMcirculation?M-MAnswerMAfterload
Updated 2026
WhichMgasMlawMexplainsMwhyMaMpneumothoraxMexpandsMasManMunpressurizedMcabinMa
scends?M-MAnswerMBoyle'sMlaw
RequestMtheMpilotMflyMatMtheMlowest,MsafestMaltitude.
GasesMexpandMatMhigherMaltitudesM-MAnswerMBoyle'sMlaw
WhichMgasMlawMexplainsMwhyMoxygenMtankMpressuresMmayMchangeMbetweenMtakeoffMa
ndMatMaltitudes?M-MAnswerMGay-Lussac'sMLaw
OxygenMtankMpressuresMdecreaseMatMhigherMaltitudeMdueMtoMcoolerMtemperaturesMshrin
kingMgasesM-MAnswerMGay-Lussac'sMLaw
WhichMgasMlawMdepictsMwhyMflightMcrewsMmayMbeMableMtoMtransportManMobeseMpati
entMinManMaircraftMinMwinterMthatMtheyMcouldn'tMtransportMinMwarmerMmonths?M-
MAnswerMCharle'sMLaw
DescribesMhowMcooerMairMisMdenser,MallowingMtheMwingsMtoMcreateMmoreMliftMinMcold
MtemperaturesM-MAnswerMCharle'sMLaw
NightMvisionMdeteriorationMstartsMatMwhatMaltitude?M-
MAnswerMNightMvisionMlossMbeginsMatM5,000MftMinMtheMindifferentMstageMofMhypoxia,
MalongMw/ManMincreaseMrespiratoryMandMheartMrate.
WhatMdoesMhypoxiaMhypoxiaMcause?M-
MAnswerMImpedesMalveolarMgasMexchange.MTheMdecreasedMbarometricMpressureMatMhigh
MaltitudeMcausesMhypoxia,MsoMhypoxiaMhypoxiaMmayMbeMreferredMtoMasMaltitudeMhypo
xia.
AMpatientMw/Memphysema/COPDMmayMexperienceMwhichMtypeMofMhypoxiaMduringMairMt
ransport?M-MAnswerMHypoxic
AMpatientMw/ManMactiveMGIMbleedMmayMexperienceMwhichMtypeMofMhypoxiaMduringMtr
ansport?M-MAnswerMHypemicMhypoxiaM
,(rhymesMw/Manemic,McellularMhypoxiaMlargelyMdueMtoMbloodMlossMorManemia)
PtsMw/McarbonMmonoxideMandMcyanideMexposureMmayMexperienceMwhichMtwoMtypesMo
fMhypoxia?M-MAnswerMHistotoxicMandMHypemic
HistoricMHypoxiaM-
Malcohol,Mcyanide,MandMcarbonMmonoxideMpoisoning,MresultingMinMtheMcellsMinabilityMto
MuseMoxygen.
CyanideMpoisoningMtxM-MAnswerMHydroxycobalamin
IncreaseMinMattitudeMincreasesMorMdecreasesMhumidityMandMtemperatureM-
MAnswerMdecreasesMboth
WhatMinjuriesMareMexpectedMfromMoverpressureMafterManMexplosion?M-
MAnswerMPneumothorax.
OccursMwhenMtheMshockMwaveMtravelsMthroughMtheMairMandMdamagesMtheMgrassMfilled
MorgansMlikeMtheMlunges.MSecondMinjuryMisMfromMflyingMdebris,MthusMpenetratingMinjur
y.M
TertiaryMheadMinjuriesMfromMbeingMthrownMtoMtheMground.
QuaternaryMinjuriesMfromMburns.
UndergarmentsMwornMunderMtheMfireMresistantMflightMsuitMshouldMbeMmadeMofMnatural
MfibersMandMshouldMbeMmadeMofMnaturalMfibers,MhowMmuchMairMspaceMshouldMbeMb
etweenMsuitMandMgarments?M-MAnswerM0.25Minch
WhenMaMhelicopterMlandsMonMaMslopeMorMunevenMterrain,MwhatMisMtheMbestMwayMto
MapproachMandMdepartMtheMaircraft?M-
MAnswerMFromMtheMdownhillMside,MinMaMcrouchedMposition.
HowMdoMyouMmanageManMinMflightMemergency?M-
MAnswerMaviate,Mnavigate,Mcommunicate
TheMprioritiesMareMtoMretainMcontrolMofMtheMaircraft,MchooseMandMappropriateMemerge
ncyMlandingMsite,MthenMreportMtheMemergencyMtoMtheMprogramMcommunicationMcenter.
AnMimpactMthatMexceedsMhowMmanyMG'sMwillMautomaticallyMactivateMtheMemergencyMl
ocatorMtransmitter?M-MAnswerM4
, WhichMuniversalMdistressMfrequencyMtransmitsMaMdigitalMsignalMincludingMGPSMlocationM
afterMELTMactivation?M-MAnswerM406MHz
TheMpilotMfailsMtoMcheckMtheMpowerMduringMliftMoffMandMtheMhelicopterMimpactsMthe
MgroundMandMsmokeMfillsMtheMcockpit.MWhatMisMtheMnurse'sMpriorityMaction?M-
MAnswerMExitMtheMaircraftMandMmeetMatMaMpre-
designatedMlocationM(12Mo'clockMposition)
WhichMinterventionMshouldMbeMperformedMfirstMforMaMpatientMinMresp.MdistressMdueMt
oMaMsimpleMpneumothorax?M-MAnswerMChestMTube
InsertionMshouldMbeMperformedMpriorMtoMbipap,MbipapMcanMpushMaMsimpleMpneumotho
raxMtoMaMtensionMpneumothorax.
InterpretMABG:MpHM7.25,MPaO2M40,MHCO3M15M-MAnswerMmetabolicMacidosis
MetabolicMAcidosisMconditions:M-
MAnswerMketoacidosis,Msalicylate,Mmethanol,MethyleneMglycolMingestion,MrenalMfailure,Mdi
arrhea,MandMlacticMacidosisMfromMshock.
InterpretMABG:MpHM7.33,MPaO2M32,MHCO3M18M-
MAnswerMPartialMcompensatedMmetabolicMacidosis
WhichMinductionMagentMisMpreferredMinMheadMtraumaMsinceMitMhasMlittleMtoMnoMeffec
tMonMMAPMandMdecreasesMICP?M-MAnswerMEtomidate
drawbacksMofMetomidateMisMthatMitMdoesn'tMprovideManalgesiaMandMpossibleMadrenalMs
uppression.
WhatMisMtheMamountMofMbloodMinMtheMventriclesMatMendMdiastole?M-
MAnswerMPreload
WhatMlawMdescribesMhowMincreasingMpreloadMincreasesMtheMventricleMstretchMandMsubs
equentMcontraction?M-MAnswerMSterlingsMlaw
WhatMisMtheMresistanceMtheMventriclesMmustMovercomeMtoMejectMbloodMintoMtheMpul
monaryMandMsystemicMcirculation?M-MAnswerMAfterload
