7. If the assembly fails to meet the specified
pull force, slide the ball off the cable and swage
a new ball in the same direction.
8. Assemble the parts and install the cover
on the housing.
Functional Check
This check will be performed at each ac-
ceptance/phased/SDLM inspection. It will also
be performed after any adjustment procedures.
Refer to Troubleshooting Chart (table 7-2) prior
to making any adjustments.
Materials required to perform the functional
check include test stand 59A120 (test stand
59A120 is covered in detail in chapter 11 of this
manual), scale (0 to 50 pounds), leak detection
compound, and a toggle reset tool.
Inspect leak detection compound before using
it. Compound that is not clear and free from
suspended material or sediment is considered
contaminated and must be disposed of. Com-
pound exhibiting peculiar odors such as acetone
or alcohol is considered contaminated and must
be disposed of.
Emergency oxygen cylinder pressures used in
this functional test are taken under ideal shop
conditions of 70°F or 21°C. Variances in air
temperatures directly affect charging pressures.
Refer to table 7-3 for details.
Ensure that the emergency oxygen cylinder is
filled to 1,800 to 2,000 psi corrected pressure.
1. Connect the oxygen outlet hose of the kit
to the bell jar coupling C-1 on the test stand, and
ensure that valve V-2 is open and all other test
stand valves are closed.
2. Attach the pull scale to the manual
emergency oxygen release handle, and test for
disengagement force. Ensure the manual oxygen
release is of the separating type before attempting
to disengage it.
3. Measure the force required to disengage the
manual oxygen release. This should be 10 to 30
pounds, and the emergency oxygen system should
actuate and indicate 45 to 80 psi on gauge PG-1
on the test stand.
4. Reinstall the manual oxygen release (if
separating type) and reset the reducer.
5. Turn the oxygen supply cylinder to the test
stand on.
6. Slowly open valve V-6 on the test stand and
adjust the pressure on gauge PG-1 to 90 psi.
Table 7-3.—Amb~nt Air Temperature vs Charging Pressures
Ambient Air
Charging
Temperature
Pressure
°F
°C
PSI
0
- 1 8
1550-1750
10
- 1 2
1600-1775
20
- 7
1625-1800
30
- 1
1675-1850
40
5
1700-1875
50
10
1725-1925
60
16
1775-1975
70
21
1800-2000
80
27
1825-2050
90
32
1875-2075
100
38
1900-2125
110
43
1925-2150
120
49
1975-22(X)
130
54
2000-2225
7. Measure the force required to disengage
the manual oxygen release with a scale. This force
should be 10 to 30 pounds.
8. Using leak test compound, check all
pressure lines and fittings on the kit for leakage.
No leakage is allowed.
9. Reinstall the manual oxygen release (if
separating type) and reset the reducer.
10. Using valve V-6, increase pressure until
the relief valve unseats. However, do not increase
the pressure above 150 psi. Unseating can be
determined by listening, and by observing gauge
PG-1 on test stand.
11. Repeat step 10 several times to establish
a correct pressure. Relief valve will unseat at 120
to 140 psi when pressure is increased, and reset
at 110 psi minimum when pressure is decreased.
The pressure is reduced below the opening
pressure of the relief valve by closing valve V-6
and opening bleed valve V-5. Once reset, the relief
valve will be leaktight.
12. Check the relief valve with leak test
solution. No leakage is allowed.
13. Close valve V-6 and bleed oxygen pressure
from the system by opening valve V-5. All
pressure is bled when gauges PG-1 and PG-4
indicate zero pressure.
14. Close valve V-5.
7-7
