Week 9 - Air Washington

Report
Connectors
Connectors are a major cause of
equipment failure.
Pins are wired incorrectly, bare wires
touch and short circuit or connector
pins are accidently bent.
Failed connectors can mimic
system chassis failure
DC Direct Current
AC Alternating Current
Alternating Current
Alternating Current
Alternating Current
Radio Signal or Alternating Current (AC)
Removing pins from connector
Local Companies like Pan Pacific
build connectors for Boeing
Typical
connector
from your
text
“Bayonet coupling A quick coupling mechanism for mating a plug onto a
Receptacle utilizing three equally spaced pins protruding from the
receptacle shell which engage corresponding ramps milled into the
coupling nut of the mating plug. Mating and unmating is accomplished
by rotating the coupling nut.”
Radio Frequency Connectors
• BNC Bayonet Neill
Concelman (British Navel
Connector)
• TNC Threaded Neill
Concelman connector
• Series N Plug (connector)
weatherproof, RF connector,
with consistent performance
through 11 GHz. Primary use
is connecting and terminating
Coax RG-8, RG- 58, RG-141
and RG- 225
• SMA connectors
(Subminiature) Screw type
mechanism like F connector,
50 ohm impedance, Electrical
performance DC to 17 GHz.
Sockets
replaces the
historic Male
and Female
connector
http://rmsconnectors.com/
RMS company
Connector Catalog with Mil-Spec
data
http://rmsconnectors.com/pdfs/rm
s_connectorsGuide.pdf
Polarization
D Subminiature.
• D Subminiature.
– The "D" refers to the shape of
the connector, which is wider
on one side to prevent the
plug from being inserted
incorrectly.
– The connector is often used in
circuits under about 5 amps,
such as power, audio, digital
signals and ground.
– Manufactured in many sizes
sizes, with 15-and 25-pin
models common in avionics.
– The type sold in most
electronics stores for PC use
are unreliable for aviation use.
A good connector will also
have a sturdy system for
removing strain on the cable.
ARINC Connectors
When old airline aircraft are upgraded with digital avionics (such
as the Boeing 747-400) the flight deck becomes a "glass cockpit,"
meaning EFIS, the electronic flight instrument system. Digital
equipment requires ARINC 600 connectors
• 404
• http://www.te.com/cat
alog/feat/en/c/18538
.
• 600 – used on new
digital equipment
• http://www.te.com/cat
alog/feat/en/c/18598
600 connectors
ARINC 600 Rack and Panel Connectors
150
connections
in one block
• A large variety of
tools are used for
inserting and
extracting pins
from connectors
• A large Aviation
industry
surrounds the
construction of
connectors.
• Tools like these
are replacing the
soldered type
connectors
Connector tools
Heat Gun
A heat gun is essential for heat shrink
tubing and solder sleeving.
Heat Gun
• Video of Heat Gun
http://www.youtub
e.com/watch?v=NR
n9lYKD-Wg
• Video of N
connector
http://www.youtub
e.com/watch?v=wD
P6nFwqAps
Coax Connectors
http://www.te.com/catalog/menu/e
n/26435
Coaxial Cables have the
following construction
Metallic center
conductor
Layers of Dielectric or
insulating Material
A shield
Foil
Wire mesh
A protective jacket
Coaxial or Coax Cable
The inner and outer conductors are separated by
an insulating layer known as dielectric.
Choice of materials and dimensions determines
the cable's electrical properties, including
attenuation at various frequencies.
TNC next to BNC
Coax
coax
Coax
Video of coax
Single shield Coax
2 Shields for immunity to electrical
noise--Ingress
This is not
Twinax, see
below
connector
Triaxial cable
Twinaxial
Coax Bend Radius
Wiring to hold connectors in place
Lockwire
Applications other than Avionics
Safety wire or lockwire is a type of positive locking device that prevents fasteners
from loosening due to vibration and other forces. The presence of safety wiring
also serves to indicate that the fasteners have been properly tightened.
Safety Wire
Connectors (soldered)
Connectors
• “Working with
connectors often
takes up more of an
installation
technician's time
than any other task”
quote from your text.
• Light aircraft have
connectors in the
dozens while large AC
have them in the
hundreds.

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