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EFFECTIVITY:
CIRRUS AIRCRAFT WIRING MANUAL MODEL SR20
19 Sep 2010
C. Wire Harness Marking
Wire harnesses are also marked for ease of identification during fabrication and installation. Wire har-
nesses are marked using the following methods:
(1) Markings
Each wire harness shall be marked with a unique number that identifies its location in the air-
plane. Wire harness numbers shall start with a “W” followed by a unique three (3) digit number
that corresponds to the wire harness location. The following numbering convention is used:
(a) 001-299 Firewall Forward
(b) 300-399 Left Wing
(c) 400-499 Right Wing
(d) 500-999 Fuselage
Wire harnesses are marked with a tag that identifies the wire harness number and the wire har-
ness part number. This tag is attached to the wire harness adjacent to the plug or jack that pro-
vides primary power or signals to the wire harness.
D. Plug and Jack Marking
Plugs and jacks are marked to aid in identification during fabrication, installation, and troubleshooting.
Plugs and jacks are be marked using the following methods:
(1) Markings
Plugs and jacks are marked with a unique number that identifies their location in the airplane.
The first character is a “P” for plugs or a “J” for jacks. The plug or jack designation is followed by
a unique three (3) digit number that corresponds to the plug/jack location. The following number-
ing convention is used:
(a) 001-299 Firewall Forward
(b) 300-399 Left Wing
(c) 400-499 Right Wing
(d) 500-999 Fuselage
Plugs and jacks are marked with a tag that identifies the plug or jack number. This tag is
attached to the wire harness adjacent to the plug or jack.
Relay bases or sockets do not require marking. Bases are directly marked with paint or visible
permanent marker with the base identification number.
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