Download US - Aqua Lung

97
4.14 Microphone Assembly Adjustment
NOTE - The 103022 thru 103025 masks use the modified M-169A/AIC 5-ohm microphone.
Refer to the following for informational guidance on how to achieve optimum voice and speech intelligibility
performance of the mask-mounted microphone. This information applies to the GENTEX modified
M-169A/AIC microphone (9).
1. When viewing into the internal mask cavity, the microphone element should have the word “FRONT”
facing the aircrew member, indicating “talk side” (Ref. Figure 4-7a).
2. To achieve best operating performance, the microphone element should be positioned no more than
6.4 mm (¼ inch) away from the lips. Additionally, the element should be centered between the inhalation
and exhalation valves (Ref. Figures 4-18 and 4-19).
3. Some wearers may experience slight discomfort if the microphone element is touching their lips
and mouth. This can be remedied by moving the element from side to side within the mask cavity.
Background noise may be picked up in the communication system if the element is placed directly over
the inhalation or exhalation valve.
¼” Max
FRONT
Figure 4-18
Figure 4-19
Microphone Assembly “Talk Side”
Microphone Assembly Positioning
(Modified M-169A/AIC)
(Modified M-169A/AIC Shown)