Avionics News April 2012 - 41

When an airplane turns up for work – whether planned or not – wiring will be an issue. Before quoting a job, it’s a good idea to carry out an inspection. What kind of wire is behind the panel, and what condition is it in?

Consider a general aviation customer trying to save money on a radio upgrade: Is a new antenna and cable required? Of course, your first step is to check the specifications to see if the old ones are compatible. But, even if they appear to be, check their age. A customer buying a new radio because he’s getting poor results with his old one may be unhappy to find he still has bad results when the new radio’s performance is limited by old, chafed wire and corroded connectors. Speaking of chafing – that’s a serious problem. Chafed wire caused total electrical failure of a Jetstream 4100 in 2005, resulting in an AD requiring modifications to all such aircraft in the UK. A 2008 aircraft wiring degradation study conducted by Raytheon Technical Services for the FAA found chafing was caused by oversized, loose or out of alignment clamps, which allowed cables to move and vibration from contact with the aircraft structure and/or components, such as fuel lines. The study identified a number of other problems, including accelerated aging of wire and cable in high moisture areas. This can lead to brittle insulation prone to cracking when handled. It noted most wiring failures occur within 3 inches of the back of a connector due to insufficient strain relief. Raytheon was particularly concerned about problems being created during avionics installation and modification, citing “poor crimping of lugs,
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Avionics News April 2012

Table of Contents for the Digital Edition of Avionics News April 2012

Point of Communication
AEA Now
The View from Washington
International News and Regulatory Updates
Datalink Weather
Member Profile
Where Are They Now?
Before & After
Phoebe Fairgrave Omlie
A Conversation With...
Aircraft Electrical Wiring
Meet the AEA Staff
Member Profile
The AEA Ambassador Program
Business Basics
Pro-to-col
Industry Profile
Theory & Practice
What's New
Marketplace Classifieds
Avionics News April 2012 - Cover1
Avionics News April 2012 - Cover2
Avionics News April 2012 - 1
Avionics News April 2012 - 2
Avionics News April 2012 - 3
Avionics News April 2012 - Point of Communication
Avionics News April 2012 - 5
Avionics News April 2012 - AEA Now
Avionics News April 2012 - 7
Avionics News April 2012 - 8
Avionics News April 2012 - 9
Avionics News April 2012 - 10
Avionics News April 2012 - 11
Avionics News April 2012 - 12
Avionics News April 2012 - 13
Avionics News April 2012 - 14
Avionics News April 2012 - 15
Avionics News April 2012 - The View from Washington
Avionics News April 2012 - 17
Avionics News April 2012 - International News and Regulatory Updates
Avionics News April 2012 - 19
Avionics News April 2012 - Datalink Weather
Avionics News April 2012 - 21
Avionics News April 2012 - 22
Avionics News April 2012 - 23
Avionics News April 2012 - Member Profile
Avionics News April 2012 - 25
Avionics News April 2012 - 26
Avionics News April 2012 - 27
Avionics News April 2012 - Where Are They Now?
Avionics News April 2012 - 29
Avionics News April 2012 - 30
Avionics News April 2012 - 31
Avionics News April 2012 - 32
Avionics News April 2012 - Before & After
Avionics News April 2012 - Phoebe Fairgrave Omlie
Avionics News April 2012 - 35
Avionics News April 2012 - 36
Avionics News April 2012 - 37
Avionics News April 2012 - A Conversation With...
Avionics News April 2012 - 39
Avionics News April 2012 - Aircraft Electrical Wiring
Avionics News April 2012 - 41
Avionics News April 2012 - 42
Avionics News April 2012 - 43
Avionics News April 2012 - 44
Avionics News April 2012 - 45
Avionics News April 2012 - Meet the AEA Staff
Avionics News April 2012 - 47
Avionics News April 2012 - 48
Avionics News April 2012 - 49
Avionics News April 2012 - Member Profile
Avionics News April 2012 - 51
Avionics News April 2012 - 52
Avionics News April 2012 - 53
Avionics News April 2012 - The AEA Ambassador Program
Avionics News April 2012 - 55
Avionics News April 2012 - 56
Avionics News April 2012 - 57
Avionics News April 2012 - 58
Avionics News April 2012 - 59
Avionics News April 2012 - Business Basics
Avionics News April 2012 - 61
Avionics News April 2012 - 62
Avionics News April 2012 - 63
Avionics News April 2012 - 64
Avionics News April 2012 - 65
Avionics News April 2012 - Pro-to-col
Avionics News April 2012 - 67
Avionics News April 2012 - 68
Avionics News April 2012 - 69
Avionics News April 2012 - Industry Profile
Avionics News April 2012 - 71
Avionics News April 2012 - 72
Avionics News April 2012 - 73
Avionics News April 2012 - Theory & Practice
Avionics News April 2012 - 75
Avionics News April 2012 - 76
Avionics News April 2012 - 77
Avionics News April 2012 - 78
Avionics News April 2012 - 79
Avionics News April 2012 - What's New
Avionics News April 2012 - 81
Avionics News April 2012 - 82
Avionics News April 2012 - 83
Avionics News April 2012 - 84
Avionics News April 2012 - 85
Avionics News April 2012 - Marketplace Classifieds
Avionics News April 2012 - 87
Avionics News April 2012 - 88
Avionics News April 2012 - Cover3
Avionics News April 2012 - Cover4
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