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Cleaning and Corrosion Control - Vol. III - Avionics and Electronics

1-1. 
1-1.1. 
GENERAL. 
Today's military avionic Systems assume a 
significant share of the responsibility for mission 
completion, performance capability , and overall system 
safety. The role of avionics includes mission essential 
equipment, flight critical equipment, and aircraft 
hardware. For example, navigation, communications, 
electro nic warfare, weapon management, flight/engine 
controls and displays, and wiring are all considered 
avionics. Electronics and electrical power systems are 
also considered avionics. The reliability of thesecomplex 
systems in any environment is critical for aircraft flight 
and mission essential functions. 
Inthis manual, use Oftheterm "avionic systems" 
shall refer to any device that uses electrical 
power. The term "avionic technician" shall 
include the aviation electrician, aviation 
electronic technician, or any personnel 
authorized to perform maintenance on avionic 
systems. 
1-1.2. Corrosion is a major cause Of avionic 
equipmentfailures, particularlywhile installed in military 
aircraft. In many cases, even minute amounts of 
corrosion can cause intermittent malfunction or 
complete failure of the equipment. Past experience 
shows that in order to obtain certain electrical 
characteristics, for example, low electromagnetic 
interference (EMI), a compromise in the design 
selection of materials might be needed (for example, 
the use of conductive adhesive). Sometimes such 
compromises can lead to corrosion problems that are 
aggravated by exposure to varying environmental 
conditions (for example, EMI corrosion). Avionic 
equipment is routinely exposed to varying 
environmental conditions. These conditions include 
changing temperatures and pressures, varying 
humidity, dust, dirt, and industrial pollutants in the 
atmosphere that often initiate corrosion.