Airframe electrical system Flashcards
How many electrical phases are in an electrical alternators?
Three
What is the frequency of AC voltage used in aircraft?
400 Hz
How does a constant speed drive unit maintain a constant output frequency of the AC generator?
By maintaining a constant speed of the generator as the engine speed varies
What is an integrated drive generator ?
When a constant speed drive is combined within the alternator housing, the assembly Is known as an IDG
Where could you find the part number of a switch in an aircraft electrical system?
In the equipment table or bill of materials on the electrical circuit diagram for the aircraft
What is the main disadvantage of aluminum wire over copper wire for use is an aircraft electrical system?
Aluminum wire is more brittle than copper. it is more subject to breakage when is is nicked or when it is subjected to vibration
What size aluminum wire would be proper to replace a piece of a four gauge copper wire?
Two-gauge. When you substitute aluminum wire for copper wire, use a wire that is two gauge number larger
What is the smallest size aluminum wire that is approved for use in aircraft electrical systems?
Six gauge
Can you sabstitute aluminum wire for copper wire?
Yes, however, you must use aluminum wire two gauge sizes larger to carry the same current. Aluminum wire should never be used in runs of three feet or less, or in communication and navigation system
Can wire in free air carry the same current as wire in bundle?
Wire in free air may be used to a higher current level than the same size wire in a bundle always refer to an electrical wire size selection chart
What are common causes of wire failure in a crimped connector?
The wire was not inserted far enough into the connector and/or the connector was excessively crimped
What is one of the first things to check if an electrical component does not operate?
Always start with simple solutions and move to more complex. is the component turned on? is power available? for example, if a light doesn’t function is the system turned on, is the aircraft electrical system energized or is the bulb burnt out?
What may be provided by the manufacturer to assist in troubleshooting?
Manufactures often provide a troubleshooting logic chart
What are the four basic steps of troubleshooting?
Know how the system should operate, Observe the way the system is operating. Divide the system into smaller segments to isolate trouble. Look for the obvious problem first
When routing a fluid line parallel to an electrical wire bundle, which should be on top?
The electrical wire bundle should be on the top
