TM-9-2350-277-10
CARRIER, M113A3, M577A3, M1059A3, M1064A3, M1068A3 AND M58
TECHNICAL MANUAL; OPERATOR’S MANUAL
TM-9-2350-277-10 - Page 3 of 889
TM 9-2350-277-10
WARNING SUMMARY (cont)
WARNING
Noise from vehicle or weapons can damage hearing of soldiers in vehicle. All personnel in
vehicle must wear DOUBLE HEARING PROTECTION when guns, missile, or vehicle is
operated. Hearing protection devices must be properly worn to provide effective protection.
IfDOUBLEHEARINGPROTECTIONisnotworn
,thesafelevelofnoiseexposurewillbe
exceeded in a short time. Hearing loss occurs gradually. Each noise exposure that exceeds the
ear protection guidelines below will cause temporary hearing loss. Over time, the loss in hearing
will become permanent. Plan each day’s operation, and be sure all crew and riders have the
required ear protectors. Spare foam earplugs must be available.
DEFINITIONS:
DH-132
The "tankers helmet," also called "CVC" helmet. Must be in good condition,
with liner and earcups fitted tightly, and chin strap worn at all times.
Earplugs
Only standard issue earplugs are acceptable. All of the dismounted squad
soldiers must be trained in how to use them. Since they may be removed and
lost, spares must be carried.
Double Hearing Protection
Use of two hearing protection devices at the same time. For this carrier, use
earplugs with the DH-132 helmet.
EAR PROTECTION GUIDELINES
Driver
Must wear DH–132 helmet at all times.
Must wear DH–132 helmet plus earplugs for operations exceeding 14 miles (23 km) in 24 hours.
Must close hatch immediately if .50 caliber machine gun is fired over front part of carrier.
Hatch may remain open and locked during carrier operation.
Commander
Must wear DH–132 helmet at all times.
Must wear DH–132 helmet plus earplugs for all operations exceeding 14 miles (23 km) in 24 hours.
Hatch may be locked open at all times.
Squad Members
Must wear helmet and ear plugs at all times.
Use of Radio with Earplugs
Wearing foam earplugs in addition to your DH–132 helmet can actually improve your ability to hear the radio in
a high level noise area. DO NOT remove the earplugs to use the radio.
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