MIL-DTL-62049G
TABLE II. Lighting system voltage.
Model
External voltage (nominal)
Internal voltage (nominal)
M146C
24 Vdc
1/
110 V ac system
M146
24 Vdc
110 V ac system
M146F
24 Vdc
110 V ac system
M447
24 Vdc
110 V ac system
M750
24 Vdc
110 V ac system
M313
24 Vdc
110/220 V ac system
M447C
24 Vdc
110/220 V ac system
1/ Direct current (dc)
3.3.2.4 Blackout lights, ON. Blackout light assemblies, when turned on completely,
shall not emit energy above 700 nanometers wavelength (see 4.5.2 and 4.5.4.2.1).
3.3.3 Controls. All electrical, mechanical, and hydraulic controls shall operate without
malfunction under all semitrailer operating conditions (see 4.5.2 and 4.5.5).
3.3.4 Adjustment mechanism. All adjustment mechanisms shall function properly and
maintain adjustment within required settings during all semitrailer operating conditions
(see 4.5.2 and 4.5.5).
3.3.5 Tires and tubes.
3.3.5.1 Tires. Tires shall be class CC, style A, size 9.00-20, 8-ply rating conforming to
SAE J2014 (see 4.5.6).
3.3.5.2 Inner tubes. Inner tubes shall conform to group 2 of ZZ-I-550 for the proper size
tire specified (see 4.5.6).
3.3.6 Brake air lines. Brake air lines and fittings shall be internally clean prior to their
assembly on the semitrailer. Loss of air pressure in the service brake air line and in the
emergency brake air line shall be not greater than 5 pounds per square inch (psi) in 5 minutes.
Brake air lines shall be "snuggled" and routed against the semitrailer components; that is, brake
air lines shall be nested against flat surfaces or protective areas (see 4.5.2 and 4.5.7).
3.3.7 Torque. Torque for fasteners without specific torque requirements stated on
applicable drawings shall be torqued according to accepted industry standards for the particular
size and type of fastener used (see 4.5.2).
3.4 Reliability. The reliability of the semitrailer shall be 6000 mean miles between
failure (MMBF) (see 4.5.2 and 4.5.8).
3.5 Maintainability. Total maintenance, excluding driver/crew checks and services, shall
be not greater than 6 manhours during 6000 miles of operation. This equates to a maintenance
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