THE NEW PIPER AIRCRAFT, INC.
PA-32-301FT / 301XTC
MAINTENANCE MANUAL
PAGE 5
Jun 1/03
3I19
35-10-00
3. Servicing
the Oxygen System
Due to the nature of the process used to test compressed gas tanks, servicing and hydrostatic tests
must be conducted by a DOT or manufacturer (Scott Aviation) approved shop. The following material
gives recommended inspection and maintenance information for the various parts of the oxygen system.
A. Refilling
CAUTION: BEFORE SERVICING THE OXYGEN SYSTEM, MAKE SURE THE AIRCRAFT IS
SECURELY GROUNDED ELECTRICALLY.
CAUTION
: DO NOT OPERATE ELECTRICAL EQUIPMENT WHILE SERVICING OXYGEN
SYSTEM.
CA
UTION
: DO NOT ATTEMPT TO TIGHTEN ANY CONNECTIONS WHILE THE SYSTEM IS
CHARGED.
Refilling of oxygen systems should be done by qualified personnel. For comparison of filling
pressures to ambient temperatures refer to Chart 2. The following are parameters to be followed for
filling.
(1) Only aviators breathing oxygen (MIL-0-27210) and appropriate filling equipment should be
used to fill the system.
(2) If a cylinder has less than 5 psi pressure or has insufficient pressure to produce an audible
hissing sound when the valve is cracked, it should be removed and/or purged, and if the
condition has existed for a significant length of time, hydrostatically test cylinder.
(3) Make sure both the charge valve and recharge cart fittings are clean and free of
contamination.
WARNING: BE CERTAIN THERE IS NO OIL OR OTHER PETROLEUM BASED MATERIAL
ON THE FITTINGS OR IN THE IMMEDIATE VICINITY.
(4) Attach service cart hose to recharge port. Fill the system at a rate not exceeding 200 psig per
minute proceeding as follows:
(a) To obtain the correct filling pressure for the oxygen system at various ambient
temperatures, a table is included for your convenience. The pressures given are not exact,
but sufficiently accurate for practical purposes of working pressures between 1800 and
2400 psig cylinders. The cylinder should be allowed to cool to a stabilized temperature
after filling before checking against the values in Chart 2.
(b) When using a recharge unit consisting of one supply cylinder, slowly open the valve of the
supply unit and allow the oxygen to transfer.
(c) When using a recharge unit consisting of two or more supply cylinders (cascade storage
system), it is recommended that the following procedure be used:
1
Before opening any valves, check the pressure remaining in the airplane's oxygen
cylinder. If it is still partly charged, note the pressure indicated on the cylinder gauge.
Then open and close each valve on the cascade storage system and determine
which cylinder has the lowest pressure. When found, if this cylinder has a pressure
lower than the oxygen cylinder in the aircraft, do not attempt using it for filling; use
the storage cylinder that has a pressure higher than the aircraft's cylinder but lower
than the others.
2
Open the valve on only the one storage cylinder with the lowest pressure. When the
pressure indicated on the aircraft's oxygen gauge and charging gauge has become
equal, close the valve of the storage cylinder, then go to the storage cylinder with the
next higher pressure and repeat the procedure.
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