MIL --- PRF --- 51191G(EA)
document takes precedence. Nothing in this specification, however, supersedes applicable
laws and regulations unless a specific exemption has been obtained.
3. REQUIREMENTS
3.1 First article. When specified (see 6.2), a sample shall be subjected to first article in-
spection in accordance with 4.2.
3.2 Interface requirements.
3.2.1 Maximum critical dimensions. The size of the air heater shall not exceed the follow-
ing critical dimensions: The maximum length (distance between furthest inlet port location
and furthest outlet port location) shall be no greater than 7.32 inches. The distance between
the bottom of the mounting bracket (base plate) and the highest point on the controller hous-
ing (excluding the control knob) shall be no greater than 5.95 inches when the center axis of
the controller is oriented perpendicular to the mounting bracket. The controller shall not ex-
ceed a "footprint" of 2.78 x 3.70 inches, whereby the 2.78 inches is parallel to the longitudinal
axis of the heater to allow necessary clearance for hose connections. A "footprint" is defined
as the maximum length and width of the controller in any plane parallel to the heater base
when the controller is upright relative to the base plate.
3.2.2 Compatibility with interfacing parts. In addition to the requirements in 3.2.1, the
following requirements shall be met to insure compatibility of the air heater with the vehicle
and its Gas Particulate Filter Unit (GPFU) system. The degree of movement, orientation
and number of the air inlet and outlet ports shall be equivalent to those on Drawing
5 --- 19 --- 1782 in form, fit and function. Two threaded plugs, which are form, fit, and function
equivalent to those on Drawing 5 --- 19 --- 1782, shall be installed in the side inlet and outlet
ports. Material selection of the plugs and heater's housing shall prevent galvanic corrosion
between the plugs and the housing. (Additional plugs may be required by solicitation or spe-
cial packaging instruction.) Female screw threads in the inlet and outlet ports of the heater
and those in the heater for the attachment of the controller to the heater shall conform to
ASME B1.1 and be compatible in form, fit, and function to threads defined for the inlet and
outlet ports and in Detail B of Drawing 5 --- 19 --- 1782, respectively. The cable connectors on
the air heater shall be interoperable and interchangable with those shown on Drawing
5 --- 19 --- 1782 and in MS27142 and MS27144. The female and male connectors shall remain
firmly attached except when normal hand force is used to separate them. The hole size and
pattern in the mounting bracket of the heater shall conform to Detail C of Drawing
5 --- 19 --- 1782. The heater with controller shall have the capability to be mounted in the guard
assembly (part no. 12910415) without interference.
3.2.3 Controller features. The controller shall be capable of being removed from the heat-
er and remotely mounted inside the vehicle on a mounting that has the same threaded hole
pattern as is described by Detail B of Drawing 5 --- 19 --- 1782. The controller shall enable the
operator to change the air stream temperature over a continuous range via a temperature
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