MIL-DTL-10215M
3.3.1.2.2 Fastening. The dial shall be secured to the body of the speedometer or tachometer
in such a position that the marking on the face of the dial and the numerals on the odometer or engine
hour meter shall be legible when illuminated through the case window from an outside source.
3.3.1.3 Pointer. The pointer shall be attached to the indicator movement and shall be
damped to reduce oscillation from vibration. The pointer shall not touch the dial or window. The
shape of the pointer shall facilitate reading of any point in the range of the dial. Not less than the top
half of the visible portion of the pointer shall be white conforming to color number 37875 of
FED-STD-595. Damping of oscillation shall be in accordance with Table II.
3.3.1.4 Recording devices.
3.3.1.4.1 Odometer. The instrument, when furnished for use with a speedometer, shall be of
the nonreset-type, consisting of six numeral wheels located in the dial as shown in figure 8. The
odometer shall totalize and record actual mileage up to 99,999.9 in multiples of 0.1 mile before
automatically turning to zero. Accuracy shall be in accordance with Table II.
3.3.1.4.2 Engine hour meter. The engine hour meter shall accurately record hours of
engine operation. It shall totalize and record up to 9,999.9 hours in multiples of 0.1 hour or up to
9,999.99 hours in multiples of 0.01 hour before automatically turning to zero. Accuracy shall be
in accordance with Table II.
3.3.2 Drive mechanism.
3.3.2.1 Flexible shaft assembly. A flexible shaft assembly shall drive speedometers and
tachometers with adapters as required. The assembly shall consist of a flexible outer casing and a
flexible inner core. The outer casing shall be equipped with reusable means for attaching the
assembly to both the instrument and the take-off point. The configuration shall fall within the
envelope limits indicated in figure 1, figure 2 or figure 3, as applicable. End connections affecting
interchangeability shall conform to the interface requirements in figure 1, figure 2 and figure 3. A
means shall be provided in the assembly to prevent the core from falling out.
3.3.2.1.1 Core. The flexible shaft assembly core shall conform to figure 4. The outer
layer of core wires shall be wound in the direction of right hand lay.
7, as applicable.
3.4 Performance. Table II applies. Verification of the parts under consideration will be
components described by this specification shall meet the minimum requirements of Table II
after being tested under a variety of operational conditions to include: a) resistance to wear, b)
verification of operating torque for shaft assemblies and adapters to include flexibility, torsional
and tensile strength and c) resistance to potentially damaging environmentally induced
conditions to include lubrication leakage, vibration resistance, shock resistance, water
submersion, corrosive conditions, fungus contamination and ozone exposure (see Table III).
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