Gentex HGU-55/P, Operation And Maintenance Instructions With Illustrated Parts Breakdown

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Chapter 4: Replacement Parts and Optional Items
Helmets with boom microphones
Helmets are available with various types of boom microphones installed for airlift or trainer use.
These include wire booms and flex booms, as well as dynamic and electret microphones and
communications cords. The following components are available.
Boom mount and accessories
( Figure 4-22 ):
• Black boom: 71B2285
• Swivel assembly: 78A4047
• Washer: 69A2142
• Microphone cord, 13½ inches: 69C2080
• Black cord clip: 69A2136
• Strain relief plate: 69A2060
Microphones and communications cords
( Figure 4-23 ):
• Microphone, 5-ohm dynamic : 78A4046-1
• Microphone, 150-ohm dynamic : 77A3484
• Microphone, electret :
79B4568-2
• Communications cord, 25 inches,
with U-174 plug: 77C3523-1
• Lower cord with mask/boom switch:
06D12449-1
Flex booms ( Figure 4-24 ):
• Flex boom with U-173 plug and 5-ohm
dynamic microphone: 03B11804-08B
• Flex boom with U-173 plug and 150-ohm
dynamic microphone: 03B11804-07B
• Flex boom with U-173 plug and
amplified
electret microphone: 04C11892-05B
• Flex boom flush mount kit:
04A11895-1
Figure 4-22. Boom and Accessories
Figure 4-23. Microphones and Cords
Figure 4-24. Flex Boom and Kit
Boom
Swivel
Strain relief plate
Microphone cord
Washer
Cord clip
M-87A/AIC
MICROPHONE DYNAMIC
Dynamic microphone
Communications cord
Lower cord
Mask/boom
switch
Electret microphone
Flex boom
Flex boom
flush mount kit