737 MAX Flight Crew Operations Manual
Airplane General, Emergency
Equipment, Doors, Windows -
Systems Description
MN-FLT-OH-201
1.40.17
CAUTION: Do not push the harness “cross” straps into or behind the nose
piece. Doing this may cause the cross straps to hang up on the
mask during inflation.
• Position the supply hose along the side of the rolled facepiece on the
outboard side (relative to the aircraft).
• Insert the mask-regulator assembly into the stowage box, beginning
with the harness (regulator up).
• Press down on the mask-regulator until all but the regulator control
knob is below the top surface of the stowage box.
• Close the right-hand door. The “OXY ON” flag will slide into view.
• Close the left-hand door, ensuring not to pinch the hose
• Press, then release the “TEST AND RESET” control lever on the
right-hand door. Ensure that the “OXY ON” flag disappears when the
lever is released.
WARNING: Do not push the red Release Levers on the regulator. Doing this
will inflate the harness and prevent the correct stowage of the
mask-regulator.
March 1, 2021