MIL-PRF-85281C(AS)
3.6.1 Degree of enclosure. The degree of enclosure for exposed equipment (see 3.3.11.1.1)
shall be watertight (see 6.4.5), and for sheltered equipment (see 3.3.11.1.2) shall be water
controlled (see 6.4.4). Flow paths shall lead to a low point area equipped with drainage facilities
to ensure complete overboard discharge by natural gravity flow.
3.6.2 External connections. The method and placement of external connections for HRS
equipment shall be in accordance with NAVAIRWARCEN Drawings 520895, Sheets 2 and 3;
520896, Sheet 2; and 520897.
3.6.3 Equipment mounting. Equipment mounting provisions shall be in accordance with
NAVAIRWARCEN Drawing 621154. The electronic components assembly and the
control-indicator shall be designed for bulkhead mounting.
3.6.3.1 Shock and vibration. HRS components shall withstand shock and vibration
environments. There shall be no decline in performance after testing (see 4.3.3.10 and 4.3.3.11).
3.6.4 Controls, indicators, and panel layouts. Controls and indicators for the electronic
components assembly and for the control-indicator shall functionally conform to 3.3.7; panel
illumination is required. In addition, the panel of the control-indicator shall be designed for non-
illuminated areas. Panel layouts shall conform to NAVAIRWARCEN Drawing 212602 and
212603, Sheet 2. The electronic components assembly shall include a time totaling meter to
indicate elapsed time for set operation and a key switch to disable the servo drive of the
stabilization data indicator assembly for maintenance safety.
3.7 Thermal design. Thermal design shall encompass natural convection using inlet/outlet
vents. Equipment design shall not require forced air or water cooling. HRS components shall not
display any performance deterioration after testing in accordance with 4.3.4.1.
3.8 Identification and marking. Functional labeling on equipment shall be user friendly with
respect to visibility and readability. Conductor and terminal end identification internal to
equipment shall be conspicuously placed for electrical safety and information.
3.9 Workmanship. The HRS shall be clean in appearance. There shall be no burrs on
threaded parts. Bearing assemblies shall have no surface defects, binding, or galling. Wiring shall
be routed to avoid rough surfaces. Shielding/insulation shall prevent short circuits and leakage.
Clearance between wires or cables and heat generating parts shall minimize deterioration.
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