Installation
82005-IM-K
Sandel SN3500 Installation Manual
Page 3-2
§ 25.1321(b) stipulates: “The flight instruments required by §25.1303 must be
grouped on the instrument panel and centered as nearly as practicable about the
vertical plane of the pilot’s forward vision.” In addition - §25.1321(b)(4) states: “The
instrument that most effectively indicates direction of flight must be adjacent to and
directly below the instrument in the top center position.” Similar regulations apply to
FAR Part 29 Transport Category Rotorcraft and to Part 23 Small Airplanes.
Refer to Sandel Avionics, Drawing No. 82005 titled, “Layout - SN3500 Installation” for
specific assembly and mounting instructions.
3.2.4
Electrical Installation Considerations
Connections and functions of the SN3500 are described in this section. Refer to the
SN3500 Interconnect Wiring Diagrams for detailed wiring information and appropriate
notes. Refer to the Functional Pinout Descriptions for explanations of pin functions.
A. The installing agency will supply and fabricate all wiring harnesses. The
length and routing of wires must be carefully measured and planned before
the actual installation is attempted. Avoid sharp bends in the harness or
locating the harness near aircraft controls. Observe all recommended wire
sizes and types and subscribe to appropriate FAR Parts 23, 25, 27, and 29, as
well as AC 43.13-1( ) and -2( ).
B. The use of MIL-C-27500 shielded wire and MIL-W-22759 single conductor
wire is recommended. The use of ferrules or grounding blocks for signal
ground and digital ground returns is satisfactory, however, each ground return
must be electrically separated.
C. When an existing installation of a navigation source selection relay unit is
installed to provide mode control switching and annunciation for a GPS or
other long-range navigation system, the SN3500 may not perform these
functions simultaneously. This does not preclude the SN3500 from
annunciating such mode control functions.
D. In order to ensure optimum performance the SN3500 and associated wiring
must be kept at least a minimum of three feet from high noise sources and not
routed with cables from high power sources.
E. Prior to installing the SN3500, a point-to-point continuity check of the wiring
harness should be accomplished to verify proper wiring. See
FUNCTIONAL
GROUND TEST PROCEDURES/REPORT
in the appendix for verification of
this step and other checks.
F. The Functional Pinout Descriptions on the following pages will assist you in
determining installation requirements.
Adhere to all notes within these
descriptions and on installation wiring diagrams
.
G.
Special caution
must be taken to observe 30 Hz OBS resolver connections in
order to prevent possible damage to the installed VOR/localizer converter.
Summary of Contents for SN3500
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