Originally Posted by
ukv1145
Nitrogen OR Helium, the bottles generally come from the OEM filled with helium and is an option in the AMM (slightly different charge pressures apply) final bag pressure is dependent on temperature and gas type.
My original reply was to a comment about the bottles being mixed nitrogen and helium.
Per the AMM:
HELIUM AND NITROGEN CANNOT BE MIXED IN THE SAME FLOTATION
BOTTLE. IF OPERATOR SWITCHES FROM HELIUM TO NITROGEN,
BOTTLE MUST BE COMPLETELY EVACUATED BEFORE BEING FILLED
WITH NITROGEN.
HELIUM CHARGED BOTTLES AND NITROGEN CHARGED BOTTLES CANNOT
BE INSTALLED ON THE SAME HELICOPTER, ALL FLOTATION
BOTTLES MUST BE FILLED WITH SAME INFLATION MEDIUM.
Bag operating pressure at standard day conditions is 3.5 psi but yes could vary due to atmospheric conditions. Just trying to be accurate not argumentative, too much of that on these sites already.