FAA Advisory Circular 43.13-1B
Acceptable Methods, Techniques, and Practices
Aircraft Inspection and Repair
AC 43.13-1B | 9. Aircraft Systems and Components | 3. Emergency Equipment | 9-48. Inspection
9/27/01
AC 43.13-1B CHG 1
appears to have been tampered with, the para-
chute must be repacked by a properly certified
rigger.
in the cylinder. The pressure-indicating line
connection is normally located between the
cylinder and a pressure-reducing valve.
b. Safety Belts shall be of an approved
type. All seat belts and restraint systems must
conform to standards established by the FAA.
These standards are contained in Technical
Standard Order TSO C22 for seat belts and
TSO C114 for restraint systems.
NOTE: Some of the gaseous oxygen
systems do not use pressure-reducing
valves. The high pressure is reduced
to a useable pressure by a regulator.
This regulator is located between the
high- and low-pressure system.
(1) Safety belts eligible for installation
in aircraft must be identified by the proper
TSO markings on the belt. Each safety belt
must be equipped with an approved metal to
metal latching device. Airworthy type-
certificated safety belts currently in aircraft
may be removed for cleaning and reinstalled.
However, when a TSO safety belt is found
unairworthy, replacement with a new
TSO-approved belt or harness is required.
(2) The webbing of safety belts, even
when mildew-proofed, is subject to deteriora-
tion due to constant use, cleaning, and the ef-
fects of aging. Fraying of belts is an indication
of wear, and such belts are likely to be unair-
worthy because they can no longer hold the
minimum required tensile load.
(3) Safety belts shall be repaired in
accordance with specifications approved by the
responsible FAA ACO.
9-47. OXYGEN SYSTEMS. The following
instructions are to serve as a guide for the in-
spection and maintenance of aircraft oxygen
systems. The information is applicable to both
portable and permanently-installed equipment.
a. Aircraft Gaseous Oxygen Systems.
The oxygen in gaseous systems is supplied
from one or more high- or low-pressure oxy-
gen cylinders. Since the oxygen is compressed
within the cylinder, the amount of pressure in-
dicated on the system gauge bears a direct re-
lationship to the amount of oxygen contained
CAUTION: Oxygen rich environ-
ments are dangerous.
b. Portable Oxygen Systems. The three
basic types of portable oxygen systems are:
demand, pressure demand, and continuous
flow. The components of these systems are
identical to those of a permanent installation
with the exception that some parts are minia-
turized as necessary. This is done in order that
they may be contained in a case or strapped
around a person’s shoulder. It is for this port-
ability reason that special attention be given to
assuring that any storage or security provision
for portable oxygen equipment in the aircraft is
adequate, in good condition, and accessible to
the user.
NOTE: Check portable equipment
including its security provisions fre-
quently, since it is more susceptible to
personnel abuse than a permanently-
installed system.
9-48. INSPECTION. Hands, clothing, and
tools must be free of oil, grease, and dirt when
working with oxygen equipment. Traces of
these organic materials near compressed oxy-
gen may result in spontaneous combustion,
explosions, and/or fire.
a. Oxygen Tanks and Cylinders. Inspect
the entire exterior surface of the cylinder for
indication of abuse, dents, bulges, and strap
chafing.
(1) Examine the neck of cylinder for
cracks, distortion, or damaged threads.
Par 9-49
Page 9-37