CIRRUS AIRCRAFT WIRING MANUAL MODEL SR20
20-00
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EFFECTIVITY:
STANDARD PRACTICES: WIRING
1. GENERAL
This chapter contains requirements and procedures for the fabrication, repair, and marking of wire harness
assemblies, cables, and wires. All wiring repairs and marking of wire harness assemblies, cables, and
wires should be accomplished in accordance with the procedures in this chapter and in accordance with
FAA Advisory Circular AC 43-13 (latest revision).
A. Terminology
The following terms are used throughout this chapter. The maintenance technician should be familiar
with the following definitions, materials, and procedures:
• Wire: An individual insulated wire. Either stranded or solid.
• Cable: A multi-conductor cable. In most cases this is a shielded twisted-wire cable that is jacketed
with a Teflon material.
• Wire: Bundle A group of wires and/or cables that are tied together using tie string, tie wraps, or
other methods. In some cases the wire bundle may be covered with an external sheath.
• Wire Harness: A complete assembly including a wire bundle and the associated connectors, fas-
teners, and markings.
• Plug: A connector with female pins (sockets) normally used on the power side (coming from an
electrical source) of a connection of two or more bundles or devices.
• Jack: A connector with male pins normally used on the device side of a connection.
B. Wire and Cable Marking
Wire marking aids the technician in locating and identifying individual wires within a wire bundle. Wire
marking consists of a combination of letters and numbers that identify the wire, circuit or system, wire
gauge, and additional data that helps in wire identification.
(1) Numbering
(a) Wires are numbered to identify the system, circuit, wire number, wire gauge, and signal
type. For example, wire ANGP003-20N indicates a 20 AWG ground wire for the GPS
receiver.
(b) Each wire is numbered within 6 inches of the termination at each end and every 12 to 15
inches along the length of the wire with the following exceptions:
1
Wires less than 6 inches in length may not be marked.
2
Wires installed within conduit are marked within 6 inches of termination ends.
3
Wires 6 to 24 inches in length and having one end terminated by a terminal ring,
spade lug, or soldered to a device are marked by a single marker on the external
connector end.
4
Assemblies consisting of a single wire with terminal rings or spade lugs on each end
and not having a wire number are not marked but are labeled with the part's assem-
bly number and revision level.
5
Wires 6 to 24 inches in length, not meeting the above criteria, are marked within 6
inches of each termination end.
(2) Marking
(a) Wires are marked by stamping directly onto the wire insulation, or are marked by attaching
printed sleeving or tape.
(b) Each wire and/or cable is marked by using the codes listed in Figure 20-001.
19 Sep 2010
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