MSA FireHawk M7XT Fonctionnement/Entretien page 9

VISUAL INSPECTION AND FUNCTIONAL TESTS
a. Close the cylinder valve and purge any air from the sys-
tem using the bypass knob on the Firehawk Regulator.
b. Hold the facepiece against the face to create an effec-
tive seal.
c. Attach the Firehawk Regulator to the facepiece and
inhale until the facepiece begins to collapse against the
face. Hold breath for approximately 10 seconds.
Negative pressure should be maintained and the face-
piece should remain collapsed against the face for the
entire 10 seconds.
d. Do not use the air mask if negative pressure cannot be
maintained in the facepiece. Return the Firehawk
Regulator and facepiece to a certified repairperson.
2. Check Firehawk Regulator operation.
NOTE: Firehawk Regulator functional checks must be conduct-
ed with a full cylinder. Check the pressure gauge on the cylin-
der valve to verify that the cylinder is full.
a. Push the release buttons on the side of the regulator.
b. Ensure that the regulator bypass knob is fully closed
(clockwise).
c. Observe the LED display of the FireHawk M7 HUD or
I-HUD. Ensure that the cylinder valve is completely
opened.
d. Open the Firehawk Regulator bypass knob (counter-
clockwise). Ensure that air flows from the regulator.
Close the bypass knob (clockwise).
e. Attach the regulator to the facepiece. Ensure proper
regulator attachment by pulling on the regulator.
f. Don the facepiece or hold the facepiece against the face
to create an effective seal.
g. Inhale sharply to start air flow. Breathe normally. Ensure
proper regulator response. The regulator should not
make any unusual sounds including whistling, chatter-
ing, or popping.
h. Remove the facepiece from the face. Ensure that air
flows freely. Push the regulator release buttons. Ensure
that air flow stops.
i. If the regulator fails to meet any of the above checks,
remove the air mask from service. Return the regulator
to a certified repairperson.
3. FireHawk M7 HUD or I-HUD, FireHawk M7XT Control
Module, FireHawk M7XT Power Module, and Audi-Larm
Alarm.
a. Verify proper function of the FireHawk M7 HUD or I-
HUD, FireHawk M7XT Control Module, FireHawk M7XT
Power Module, and Audi-Larm Alarm by observing the
FireHawk M7XT Control Module gauge and display
when the alarms ring and tone. Perform this test with a
minimum cylinder pressure of 1200 psi for 2216 psi air
masks and 2000 psi for 4500 psi air masks.
b. Pressurize the system by opening the cylinder valve.
Listen for the FireHawk M7XT Power Module to sound
and for the Audi-Larm Alarm to ring briefly.
c. Observe the LED display of the FireHawk M7 HUD or I-
HUD. The LEDs must illuminate and correspond to the
system pressure.
d. Ensure that the alarm button on the FireHawk M7XT
Control Module and the buddy lights on the FireHawk
M7XT Power Module are slowly flashing green.
e. Allow the FireHawk M7XT Control Module to remain
motionless for approximately 20 seconds. Listen for the
FireHawk M7XT Power Module to sound the
low/high/low repeated tones of the PASS pre-alarm.
Verify that the alarm button on the FireHawk M7XT
Control Module and the buddy lights of the FireHawk
M7XT Power Module are slowly flashing red. Also verify
that the orange LED is displayed in the FireHawk M7
HUD or I-HUD. Ensure that the FireHawk M7XT Control
Module remains motionless until the full PASS alarm
activates. Listen for the FireHawk M7XT Power Module
to sound the loud PASS alarm. Look for the alarm but-
ton on the FireHawk M7XT Control Module and the
buddy lights on the FireHawk M7XT Power Module to
rapidly flash red.
f. Reset the PASS alarm by pressing the reset button (yel-
low) on the side of the FireHawk M7XT Control Module
two times within approximately one second.
g. To check the manual activation of the PASS alarm, press
and hold the alarm button on the front of the FireHawk
M7XT Control Module for approximately three seconds.
Listen for the PASS alarm to be emitted from the
FireHawk M7XT Power Module.
h. Reset the PASS alarm. Press the reset button (yellow) on
the FireHawk M7XT Control Module two times within
approximately one second.
i. Allow the FireHawk M7XT Control Module to remain
motionless until the PASS pre-alarm sounds. Shake the
FireHawk M7XT Control Module to reset the alarm.
j. Disconnect the Firehawk Regulator from the facepiece.
k. Close the cylinder valve fully.
l. Slowly crack the bypass valve on the Firehawk Regulator
to bleed off pressure until the FireHawk M7XT Control
Module pressure reading drops below the following
values:
o 785 psi - approximately (2216 psi system)
o 1600 psi - approximately (4500 psi system)
A flashing red LED must display in the FireHawk M7 HUD or I-
HUD at the appropriate pressure listed above. The Audi-Larm
Alarm will ring and the alarm button on the FireHawk M7XT
Control Module and buddy lights on the FireHawk M7XT
Power Module will flash red at this time.
m. The alarms should continue until the air pressure is 250
psi or less. If the Audi-Larm Alarm, FireHawk M7XT
Control Module, FireHawk M7XT Power Module, or
FireHawk M7 HUD or I-HUD does not function properly,
the air mask must be removed from service.
n. When the system pressure falls below 250 psi, turn the
FireHawk M7XT Control Module off (sleep mode) by
pressing the reset button (yellow) two times within
approximately one second.
4. Open the bypass valve slowly to release any remaining
pressure in the system. Close the bypass valve.
9 MSA 314 (L) Rev. 2 - 10128861