MIL-DTL-62270B(AT)
that the material meets or exceeds the operational and maintenance requirements, and promotes
economically advantageous life cycle costs.
3.2.2 Prohibited material. Asbestos, cadmium, and radioactive materials shall not be used
in this item. Radioactive material is defined by Title 10, Code of Federal Regulations (CFR)
Parts 30 and 40, and other radioactive material in which the specific activity is greater than
0.002 microcuries per gram or the activity per item equals or exceeds 0.01 microcuries (see 4.6).
3.3 Construction. Chassis components, subassemblies, and assemblies shall be fabricated
into a complete chassis in accordance with Drawing 8736997 and applicable specifications and
standards. All parts requiring identification shall be marked in accordance with good commercial
practice (see 4.6).
3.3.1 Shroud seal. The space between the upper metal surface of the engine shroud and
the sealing surface of the top deck grille shall not be less than 0.82 nor more than 1.25 inches (in.)
(see 4.6).
3.3.2 Stowed equipment. The chassis shall be capable of stowing all on-vehicle
equipment (OVE) items in the spaces provided (see 4.4).
3.3.3 Electrical system. The chassis electrical system shall consist of the hull electrical
subsystem as described below. The system shall be 24 volts direct current (Vdc), nominal
(see 4.4).
3.3.3.1 Power plant electrical. The power plant electrical equipment shall consist of the
following: sending units necessary to provide engine data in the form of electrical signals to the
operator instrument panel, an engine electrical disconnect to facilitate engine removal and
replacement, an electrical starter motor capable of starting the engine, and an air-cooled generator
(see 4.6).
3.3.3.2 Interior lighting. Each crew position shall contain a domelight to provide general
illumination when required. The domelight shall contain provisions for adjusting light intensity
and a blue filter for night vision adaptation (see 4.6).
3.3.3.3 Auxiliary outlet. One outlet (24 Vdc nominal) shall be provided in the hull to
mate with the OVE trouble light assembly. The auxiliary outlet circuit shall be protected with a
15 ampere (A), automatic reset, circuit breaker (see 4.6).
3.3.3.4 Engine manifold heater. The wiring for the engine manifold heater shall provide a
switch-actuated chassis battery circuit to the engine. Operation of the push-button switch on the
purge pump handle, with the starter switch depressed, shall provide chassis battery voltage to pin
"a" of the multiple connector at the engine electrical quick disconnect (see 4.6).
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