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MIL-T-52843C
to direct air flow toward all glazing. Each fan shall have an "on-
off" switch.
3.27.1 Safety glazing. Safety glazing of the windshield, door
windows, side and rear window shall be provided. The upright seated
operator shall have all-around visibility and visibility of the fork
carrier in all possible fork positions. When a roof window is
provided, it shall have safety glazing and it shall be sloped to
provide for water drainage and guarded as necessary to meet the FOPS
requirement (see 3.5.1). Glazing shall conform to ANSI Z26.1, type
AS1 for the windshield and roof window and type AS1 or AS2 for other
windows. Fixed or hinged glazing shall be sealed in waterproof
,
stress-absorbent molding and movable windows shall be sealed on
extra-heavy-type, pile-lined channels.
3.27.2 Interior. The interior of the cab shall be fitted with
insulation, retarding both heat loss and noise intrusion. Heavy-duty
floor mats shall be furnished. All cab openings shall be sealed with
elastomer grommets, seals, weather stripping, or body compound.
3.27.3 Windshield and window wipers  The cab shall be equipped
.
with at least two wiper assemblies to clear the windshield and the
rear window in accordance with the performance requirements of SAE
J198. Wipers shall be capable of being operated at two or more
frequencies. The frequencies must be maintained during normal engine
speed and workload. Wiper arms shall be of the heavy duty commercial
type and wiper element shall withstand an ozone rating of two or
better in accordance with ASTM D 1171. The wiper arms shall provide
tension on the glazed surfaces of at least 1 ounce per inch of wiper
arm length. A windshield washer shall be provided for the front
windshield.
3.27.4 Heater. A recirculating-air-type heater shall be furnished
in accordance with the performance requirements of SAE J1129. The
heater controls shall be within reach of the operator and shall
provide for variable selection of blower speeds and temperature. If a
fuel-fired heater is furnished, it shall be in accordance with SAE
J1024.
3.28 Electromagnetic interference  The electromagnetic
.
interference emission characteristics of the truck shall meet the
limits specified in MIL-STD-461, part 8, class Cl, group II, except
that a 20dB relaxation is permitted in the emission limits. The
operator's horn is exempt from electromagnetic interference
requirements.
3.29 Lubricants. Unless otherwise specified herein, the forklift
shall be serviced with military lubricants selected by the contractor
in accordance with table I, SAE J754. Run-in and testing shall be
performed with these lubricants as applicable for the ambient
operating temperature. A lubrication data plate identifying military
37

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