(1) Wipe mask dry. It should be thoroughly cleansed with soap and water
(inside) after 10 to 14 hours use. Be sure that exhaust flutter valve is
kept clean.
(2) Inspect mask for leaks or cracks in face-piece.
(3) Change strap adjustment only to take up natural stretch slack.
(4) Lend your mask only in extreme emergency.
(5) Protect your mask from hot sun, moisture, and rough treatment.
(6) Report all defective oxygen equipment to ground crew and to personal
equipment officer immediately on landing. See that it has been repaired
or replaced before another altitude mission.