Donning The Facepiece - MSA FireHawk M7XT Fonctionnement/Entretien

7. Check the Firehawk
Regulator's bypass
operation. Grasp the red
knob and turn it
counter-clockwise. Listen
for airflow and then turn
it to the off position.
8. Fully close the cylinder valve.
9. Listen for air leaks and watch the pressure indicators on
the FireHawk M7XT Control Module or NightFighter HUD
Transmitter for 10 seconds.
DO NOT use the air mask if the pressure drops more than
100 psi in ten seconds, The air mask must be repaired; other
wise, reduced available service time may result.
10. Crack the Firehawk Regulator bypass valve slowly to bleed
off pressure until the FireHawk M7 HUD or I-HUD and
FireHawk M7 pressure indicators drop below:
o 785 psi-approximately (2216 psi system)
o 1600 psi-approximately (4500 psi system)
At these pressures the FireHawk M7 HUD or I-HUD should dis-
play a flashing red LED, the Audi-Larm Alarm should ring con-
tinuously, and the alarm button on the FireHawk M7XT Control
Module and the buddy lights on the FireHawk M7XT Power
Module should be flashing red.
11. When the system pressure falls below 250 psi, turn the
FireHawk M7XT Control Module off by depressing the reset
button (yellow) two times within approximately one
second.
DO NOT use the air mask if the Audi-Larm Alarm fails to ring
or fails to continuously ring down to pressures of 250 psi, or
if the FireHawk M7XT Control Module or FireHawk M7 HUD
or I-HUD fails to light properly. The air mask must be
checked and corrected for proper operation by an MSA
trained or certified repair-person before using. Misuse can
result in serious injury or death.
NOTE: The FireHawk M7 HUD or I-HUD will automatically turn
itself OFF approximately 60 seconds after the air mask has
been depressurized. A red LED will flash until the device turns
off.

DONNING THE FACEPIECE

NOTE: A nosecup is always required for use with this air mask.
MSA 314 (L) Rev. 2 - 10128861
CAUTION
WARNING
DONNING
A nosecup must be installed in the facepiece. Misuse can
result in serious injury or death.
NOTE: Before donning, ensure that the Firehawk Regulator
sealing ring is seated properly in its groove on the outlet of
the regulator and that it is not torn, gouged, or nicked.
1. Loosen all the harness
straps. Grip the bottom
straps.
2. Insert chin into the lower
part of facepiece, then
pull the harness back
over the head.
3. Pull the back of harness
downward until centered
at the back of the head.
4. Tighten the two lower
straps first by pulling
them straight back, not
out. Tighten the face-
piece until the mask is
snug against the face.
12
WARNING