1 Each type … aircraft has a group … buses identified … the priority … the equipment it powers.
2 … example, a flight-essential bus may power emergency lighting, critical flight … engine instruments, … an emergency radio. Less important critical equipment receives power … an essential bus. Normal systems used to complete the assigned mission … provide crew comfort are … the main bus.
3 The input to a bus may be either dc … ac.
4 The output … the bus has a protective device such as a circuit breaker, fuse, … current limiter.
5 There are basically two types … power transfer contactors: single coil … double coil.
6 A single coil contactor consists … auxiliary contacts … two sets … three main contacts … a paralleled common output.
7 The auxiliary contacts normally control identification lights … the power control panel.
8 The two sets … three main contacts are arranged so that only one set … contacts can be closed … a time.
VIMatch the following questions with the answers:
1 What examples of group of buses identified by the priority of the equipment it
powers, has each type of aircraft?
2 How many types of power transfer contactors do you know, describe them?
3 What are the four power sources available to the F-14 aircraft?
4 List the three-phase buses of the F-14 aircraft?
| There aretwo types of power transfer contactors
|
| two sets of three main contacts
|
| normally control identification lights on the power control panel
|
| arranged so that only one set of contacts can be closed at a time
|
| relay is a two-section mechanically interlocking device having two
energizing coils
|
A)
| Electrical power is provided to the buses from four sources
|
B)
| Distribution system consists of five -phase ac buses
|
| Ac essential number one bus
|
| Ac essential number two bus
|
C)
| a flight-essential bus may power emergency lighting
|
| critical flight and engine instruments
|
D)
