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TO 33D2-10-10-41
TM 55-6695-217-13
SECTION IV
OPERATION INSTRUCTIONS
(7) Exhale  slowly;  inhalation  valve  is
4-1.  THEORY OF OPERATION.  (See figure 1-1.)
operating satisfactorily if no resistance to exhalation is
Three separate personnel equipment items are tested by
encountered.
Troubleshoot  and  repair  mask  in
separate systems within the tester.
accordance with applicable technical order if resistance
to exhalation is evident.
a. Oxygen System. The oxygen system contains
or simulates an aircraft personnel oxygen system. The
c. Headset and Microphone System.
Operate
system supplies breathing oxygen to the mask under
tester to test headset-microphone combinations as
test through oxygen hose assembly (13). Oxygen flow
indicated by equipment noted in step 1, 2 or 3. Step 4 is
indicator (10) indicates flow to the mask by closing;
applicable to all combinations.
blinker opens to show flow interruption.
b. Headset and Microphone System. This system
(1) Connect
Headset
HS-33A
and
amplifies electrical impulses from a microphone under
Microphone M-33/ AIC to cable connector U61/U (4).
test and supplies the amplified signal to a headset under
(2) Connect Headset-Microphone H-78B/AIC
test to test operation of both units.
to cable connector U92A/U (3).
c. Flash Goggle System. This system supplies 28
(3) Connect microphone M-15/R to panel
vdc electrical power to EEU-2P Flash Protection
mounted connector JJ-033 (5). Disconnect microphone
Goggles through cable connector (14) to check that the
to U92A /U when connection is made to JJ-033.
goggle lens become transparent with power applied.
(4) Depress handle switch if using hand-held
4-2. OPERATION INSTRUCTIONS. (See figure 1-1.)
microphone; microphone control indicator light should
illuminate if microphone switch is functioning properly.
Operation of the separate systems within the tester are
Speak into microphone; voice will be heard in headset if
described separately after startup.
headset and microphone are operating properly.
a. Tester Startup. Set ON-OFF switch (8) to ON;
red POWER indicator (7) should come on.
d. Flash Goggle System.  Connect power cable
from EEU-2P Flash Protection Goggles to cable
b. Oxygen System. Operate the oxygen system to
connector S-830 (14); goggles (opaque without electrical
test MS22001 or similar oxygen mask as follows:
power) shall become transparent when power is applied.
e. Tester Shutdown.  At completion of testing
(1) Set regulator (12) to NORMAL position.
accomplish steps of shutdown procedure that are
(2) Connect oxygen mask hose to oxygen
applicable to system used.
hose assembly (13).
(1) Disconnect  headset,
microphone
and
(3) Rotate regulator control to 43M position.
goggles from applicable connectors.
(4) Don headgear and mask to simulate flight
(2) Rotate regulator control (12) to NORMAL
conditions.
position and disconnect oxygen system hose (13) from
mask hose.
(5) Exhale
slowly;
observe
oxygen
flow
indicator 10).
(3) Set ON-OFF switch (8) to OFF and
disconnect power cable from power source.
(a) If blinker opens no leak.
(4) Shut off external oxygen supply and
disconnect supply from inlet fitting (9).
(b) If blinker remains closed mask leaks
and needs adjustment or repair in accordance with
(5) Cap inlet fitting to prevent entry of foreign
applicable technical order.
material.
(6) Coil cables (3, 4 and 14), power cable (1)
(6) Rotate regulator control (12) to 45M
and oxygen system hose (13) and store all under cover
position.
on face of tester.
Change 4 4-1/(4-2 blank)

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