Sandel ST3400H HeliTAWS, Installation Manual

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Bell 412
Figure 4-3 Bell 412 Series
4.4 Electrical Installation Considerations
The installing agency fabricates and supplies all wiring harnesses. Refer to the ST3400H
Interconnect Wiring Diagrams for detailed wiring information and appropriate notes.
1) Refer to the Functional Pinout Descriptions for explanations of pin functions.
2) The length and routing of wires must be carefully planned before starting the installation.
3) Avoid sharp bends in the harness.
4) Do not locate the harness near aircraft controls.
5) 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(B) and –2(A).
6) MIL-C27500 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.
7) In order to ensure optimum performance, the ST3400H and associated wiring must be
kept a minimum of three feet from high noise sources and not routed with cables from
high power sources.
8) Prior to installation, verify proper wiring by completing a point-to-point continuity check
of the wiring harness.
9) Use the Functional Pinout Descriptions to determine installation requirements.
82046-IM-K ST3400H INSTALLATION MANUAL Page 4-5