Light AC eli

Question 1

Cells

Answer 1

Primary cell cannot be recharged (zinc carbon dry)
Secondary cell is rechargeable

Question 2

Alt/gen

Answer 2

Located on engine and mechanically driven
Alt= stationary conductor (stator) rotating magnet(rotor)

Both produce ac
Alt gets to dc using rectifier
Gen uses split rings and commutator or rectifier

Question 3

AC DC rectification

Answer 3

Silicone diodes in static circuit
Electrical one way valve switches and combines ac to dc

Question 4

Brushless alternator principles

Answer 4

Removes need for slip rings and brushes to provide initial energy
Instead uses exciter( generator type coil that creates a field for rotor to gain electricity)

Question 5

Field relay and reverse current

Answer 5

Protect against battery discharging itself into alt or gen when output is low
Field relay for alt

Question 6

Current limiter

Answer 6

Prevent alternator or generator from producing more current than they are rated for
Adjusts field current by placing variable resistance in the field circuit

Question 7

BUs bar

Answer 7

Distribution centre located behind circuit breakers

Question 8

GPUs

Answer 8

Apu: for starting or running systems on ground
Can be driven by batteries, mechanically driven, or electrically powered
Connect to ac using nato adaptor or plug

Question 9

Bonding and grounding

Answer 9

Grounding: return path for equipment not mounted to airframe
Bonding: connecting components to metal airframe to eliminate build up of potential difference in static
Static causes fire and radio interference

Question 10

Static discharge wicks

Answer 10

Dissipate static build up
Carbon fibres wrapped together
Ends in a point to encourage discharge into atmosphere
Required on all ifr
Wear out but easily replaced

Question 11

GNSS

Answer 11

6 orbital planes 4 satellite per plane
Triangulates position using coded pings (need at least 4 satellites to be used 5 to choose from and the 6th for timing error)
Must check raim for outages (receiver autonomous integrity m)
Dead reckoning occurs when insufficient satellites are available to fix position

Question 12

TCAS

Answer 12

Traffic alert and collision avoidance system
Ac must be operating in mode c or s
Issues alerts by tracking and interrogating planes to determine collision
TCAS 1 offers traffic warning but no resolution
2 will provide vertical resolution advisory

Question 13

Avidyne TAS600

Answer 13

Seees mode a c and s (position alt clim/descend
Will pick up adsb but does lot read long lat hdg or callsign
Range: 7nm +/- 3500ft
Other traffic open white diamond more than 6nm and 1200 ft
Proximity alert solid white diamond ( closer than OT but not a threat)
Traffic alert solid yellow circle and voice alert (calculated intercept course is within 30 seconds .55 nm and 800ft)