19
FINAL TESTING
Subjective Test
1.
Slowly open the handwheel (18) to pressurize the system.
Check the pressure gauge (36) reads 3000 PSI (207 BAR)
or the plunger (41) is "Popped Up" on the pin style gauge (37)
indicating a full cylinder (43).
2.
Press the front cover two times for about five seconds
each, with a five second pause between each purge. Ensure
no leaks can be heard coming from the second stage. If a
leak is detected, refer to
Table 2 : Troubleshooting Guide
section of this manual to determine its possible cause.
3.
Perform a subjective breathing test to ensure the second
stage is operating properly using the following procedure:
a.
Fully depress the purge cover (44 or 66) to ensure an
adequate volume of air passes through the second stage
to clear out any water.
b.
Inhale slowly but deeply from the mouthpiece (49 or
70). A properly serviced and adjusted regulator should
deliver air upon deep inhalation without excessive in-
halation effort, free-flow or fluttering of the second
stage diaphragm (48). When exhaling, there should
be no fluttering or sticking of the exhalation valve (53
or 68). If any of these problems occur, refer to
Table 1
& 2: Troubleshooting Guides
section of this manual
to determine its possible cause.
1.
Ensure the unit is pressurized with the handwheel (18) in
the open position. Check the pressure gauge (36) reads 3000
PSI (207 BAR) or the plunger (41) is "Popped Up" on the pin
style gauge (37) indicating a full cylinder (43). Set the SEA in
a stable temperature environment for a minimum of
twelve
hours.
After the time has elapsed, check the following:
• Dial pressure gauge: Ensure gauge reads "3000 PSI".
• Pin pressure gauge: Ensure plunger (41) is "Popped Up".
Pressure Drop Test
WARNING:
The SEA is designed to assist helicopter
air crew members and passengers in emergency
egress situations from submerged aircraft. It is
very critical to ensure that no leakage is present
and the SEA has met all requirements in the Final
Testing section of this manual. DO NOT issue to a
crew member or passenger any SEA which exhibits
any signs of leakage or unsatisfactory performance
until the problem has been thoroughly diagnosed
and repairs have been made as needed, including
the possible replacement of a damaged component
or subassembly.
Immersion Test
1.
Ensure the handwheel (18) is in the open position and the
system is pressurized. Check the pressure gauge (36) reads
3000 PSI (207 BAR) or the plunger (41) is "Popped Up" on
the pin style gauge (37) indicating a full cylinder (43).
2.
Submerge the entire system in a test tank of clean
water. Shake the unit to remove trapped bubbles. Ob-
serve any bubbles rising from the submerged system
over a
five minute
period. The recommended time is
necessary due to slower bubble formation that occurs
in smaller leaks. Bubbles indicate a leak, which requires
the system to be disassembled at the source to check
sealing surfaces, assembly sequence and component
positioning in order to correct the problem.
NOTE: Do not confuse bubbles from trapped air with a
true leak. If there is an air leak, bubbles will come out in
a constant stream.
2.
Upon completion of the pressure drop test, ensure all water
is removed from the unit. Blow clean LP air through the cap (2)
holes and fill port (33) to remove excess water. After the unit
is dry, refill the unit to 3000 PSI (207 BAR). Close the hand-
wheel (18) when filling is complete and depressurize the unit.
3.
Once completely dry, install retainer cover (1) and fill port
cap (31).
4.
Providing the unit has passed all testing and the cylinder
has been filled to its full capacity as marked, the SEA is now
ready for use.
WARNING:
If the pressure gauge (36) does not read
"3000 PSI" or the plunger (41) on the pin gauge (37)
is not "Popped Up" after 12 hours, refer to Table 1
& 2: Troubleshooting Guides section of this manual
to determine its possible cause.
WARNING:
Compressed air can be highly explosive
and is dangerous if misused. Ensure the cylinder
valve is opened slowly. Use eye and ear personal
protective equipment when performing any tests
involving compressed air.
NOTE: The SEA must be cleaned and sanitized as per
local instructions before issue.
