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 | 9-49. Maintenance
AC 43.13-1B CHG 1
9/27/01
(2) Check the cylinder to determine if
the markings are legible.
(3) Check the date of the last hydro-
static test. If the periodic retest date is past, do
not return the cylinder to service until the test
has been accomplished.
(4) Inspect the cylinder mounting
bracket, bracket hold-down bolts, and cylinder-
holding straps for cracks, deformation, cleanli-
ness, and security of attachment.
(5) In the immediate area where the
cylinder is stored or secured, check for evi-
dence of any types of interference, chafing, de-
formation, or deterioration.
b. Lines and Fittings.
(1) Inspect oxygen lines for chafing,
corrosion, flat spots and irregularities, i.e.,
sharp bends, kinks, and inadequate security.
(2) Check fittings for corrosion around
the threaded area where lines are joined. Pres-
surize the system and check for leaks. (See
paragraph 9-49b(2)(d).)
CAUTION: In pressurizing the sys-
tem, actuate the valve slowly to avoid
surging which could rupture the line.
c. Regulators, Valves, and Gauges.
(1) Examine all parts for cracks, nicks,
damaged threads or other apparent damage.
(3) Determine if the gauge is function-
ing properly by observing the pressure build-
up and the return to zero when the system oxy-
gen is bled off.
d. Masks and Hoses.
(1) Check the oxygen mask for fabric
cracks and rough face seals. If the mask is a
full-face model, inspect the glass or plastic for
cleanliness and state of repair.
(2) When appropriate, with due regard
to hygienic considerations, the sealing qualities
of an oxygen mask may be tested by placing a
thumb over the connection at the end of the
mask tube and inhaling very lightly. Remove
the thumb from the disconnect after each con-
tinuous inhalation. If there is no leakage, the
mask will adhere tightly to the face during in-
halation, and definite resistance to inhalation
will be noticeable.
(3) Flex the mask hose gently over its
entirety and check for evidence of deteriora-
tion or dirt.
(4) Examine the mask and hose storage
compartment for cleanliness and general con-
dition.
(5) If the mask and hose storage com-
partment is provided with a cover or release
mechanism, thoroughly check the operation of
the mechanism.
9-49. MAINTENANCE.
(2) Actuate the regulator controls and a. Oxygen Tanks, Cylinders, and Hold-
the valve to check for ease of operation.
Down Brackets.
(1) Remove from service any cylinders
that show signs of abuse, dents, bulges, cracks,
distortion, damaged thread, or defects which
might render them unsafe. Typical examples
Page 9-38
Par 9-44