Figure 5-13.Type NO-2 gaseous oxygen servicing trailer (schematic).
To eliminate the danger of an explosion,
do noninterchange parts between oxygen
servicing equipment and air/nitrogen
After replacing the empty cylinders, the
cylinder valves on the full cylinders should not
be opened until the trailer is positioned for
servicing an aircraft.
Replacement of Drying Agent
The chemical drier should reinspected after
every 12 cylinders are used, and the chemical agent
should be replaced at the first sign of change
in the indicator. The blue-colored indicating
agent is applied on top of the white dry-
ing agent. When moisture is present, the
indicating agent will change color from blue
to pink. The indicating agent can be easily
inspected by removing the servicing hose
and unscrewing the top cap of the drier
Relieve all pressure prior to inspection/
replacement of the chemical agent.