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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 Conce
lman (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.
http://rmsconnectors.com/ RMS company
Sockets replaces the historic Male and Female connector
Connector Catalog with Mil-Spec data
http://rmsconnectors.com/pdfs/rms_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 ConnectorsWhen 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/catalog/feat/en/c/18598
ARINC 600 Rack and Panel Connectors
150 connections in one block
Connector tools• 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
Heat Gun
A heat gun is essential for heat shrink tubing and solder sleeving.
Heat Gun
• Video of Heat Gun http://www.youtube.com/watch?v=NRn9lYKD-Wg
• Video of N connector http://www.youtube.com/watch?v=wDP6nFwqAps
Coax Connectorshttp://www.te.com/catalog/menu/en/26435
Coaxial Cables have the following construction
Metallic center conductorLayers of Dielectric or insulating MaterialA shield
FoilWire mesh
A protective jacket
Coaxial or Coax CableThe 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.
Coax
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
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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