Oxygen Mask Release Lever
YA721, YA722, YC153, YC154 Squeeze and pull up –
.
releases mask from stowage box
.
releases OXY ON flag when stowage box doors open
.
initiates oxygen flow
.
inflates mask harness when inflation lever is squeezed
.
flow indicator shows a yellow cross momentarily as harness inflates.
YA613, YA686, YA687 Squeeze and pull up –
.
releases mask from stowage box
.
releases OXY ON flag when stowage box doors open
.
activates oxygen and microphone
.
inflates mask harness when inflation lever is squeezed
.
flow indicator shows a yellow cross momentarily as harness inflates.
Copyright . The Boeing Company. See title page for details.
Airplane General, Emergency Equipment, Doors, Windows -Controls and Indicators
737 Flight Crew Operations Manual
Oxygen Mask and Regulator
YA626 - YA809, YC411 - YK104
YA626, YA801 - YA809, YC411 - YK104
1
N
100%
PUSH
EMERGENCY
PRESS
TO
TEST
2
CREWMEMBER STATION
YA686 - YA722
1
N
100%
PUSH
EMERGENCY
PRESS
TO
TEST
2
OBSERVER STATION
HARNESS (shown inflated)
3
MASK MICROPHONE REGULATOR
HARNESS (shown inflated)
3
MASK MICROPHONE REGULATOR
Copyright . The Boeing Company. See title page for details.
1.30.22 June 1, 2005
Airplane General, Emergency Equipment, Doors, Windows -Controls and Indicators
737 Flight Crew Operations Manual
1 NORMAL/100% Switch
N (normal) – supplies air/oxygen mixture on demand (ratio depends on cabin
altitude).
100% – supplies 100% oxygen on demand.
2 Oxygen Mask EMERGENCY/Test Selector (rotary)
Rotate – supplies 100% oxygen under positive pressure at all cabin altitudes. PRESS TO TEST – tests positive pressure supply to regulator.
3 Smoke Vent Valve Selector
Up - vent valve closed.
Down - vent valve open, allowing oxygen flow to smoke goggles.
YA613, YA686 - YA722
HARNESS (shown inflated)
1 2 4
GOGGLES
N
MASK
100%
PUSH
MICROPHONE
REGULATOR
EMERGENCY
PRESS
TO
TEST
3
CREWMEMBER STATION
1 NORMAL/100% Switch
N (normal) – supplies air/oxygen mixture on demand (ratio depends on cabin
altitude).
100% – supplies 100% oxygen on demand.
Copyright . The Boeing Company. See title page for details.
June 1, 2005 1.30.23
Airplane General, Emergency Equipment, Doors, Windows -Controls and Indicators
737 Flight Crew Operations Manual
2 Oxygen Mask Release Lever
YA721, YA722 Squeeze –
.
inflates mask harness
.
flow indicator shows a colored cross momentarily as harness inflates.
YA613, YA686, YA687 Squeeze and Pull –
.
inflates mask harness
.
flow indicator shows a colored cross momentarily as harness inflates
.
enables the mask microphone when the left oxygen mask panel door is
opened
.
disables the boom microphone.
3 EMERGENCY/PRESS TO TEST Selector
Rotate – supplies 100% oxygen under positive pressure at all cabin altitudes.
PRESS TO TEST – tests positive pressure supply to regulator.
4 Protective Strip
There is a protective strip of clear plastic on the top portion of the lens. This strip can be peeled off using the tab on the right side in case of icing caused by a rapid depressurization.
YC153, YC154
HARNESS (shown inflated)
1 2
GOGGLES
N
MASK
100%
PUSH
MICROPHONE
REGULATOR
EMERGENCY
PRESS
TO
TEST
3
CREWMEMBER STATION
Copyright . The Boeing Company. See title page for details.
1.30.24 June 1, 2005
Airplane General, Emergency Equipment, Doors, Windows -Controls and Indicators
737 Flight Crew Operations Manual
NORMAL/100% Switch
N (normal) – supplies air/oxygen mixture on demand (ratio depends on cabin
altitude).
100% – supplies 100% oxygen on demand.
Oxygen Mask Release Lever
Squeeze –
.
inflates mask harness when lever is squeezed
.
flow indicator shows a colored cross momentarily as harness inflates.
EMERGENCY/PRESS TO TEST Selector
Rotate – supplies 100% oxygen under positive pressure at all cabin altitudes. PRESS TO TEST – tests positive pressure supply to regulator.
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