Recip Ignition Starting Sys.

Question 1

Name the different circuits of a magneto:

Answer 1

1) Magnetic circuit
2) Primary circuit
3) Secondary circuit

Question 2

The magneto primary circuit consists of:

Answer 2

1) Coil
2) Breaker Points
3) Ignition Switch
4) Capacitor

Question 3

The magneto magnetic circuit consists of:

Answer 3

1) Magnet
2) Pole shoes
3) Coil core

Question 4

The magneto secondary circuit consists of:

Answer 4

1) Secondary coils
2) Distributor (rotor & housing)
3) Harness & plugs

Question 5

Benefit of magnetos over battery ignition systems:

Answer 5

1) Magnetos are lighter weight.
2) Has its own source of electrical energy.

Question 6

To turn on a battery ignition system the circuit must be ______.

Answer 6

Closed.

Question 7

To turn on a magneto system the circuit must be ______.

Answer 7

Opened.

Question 8

Purpose of the capacitor in the magneto:

Answer 8

To prevent arcing at the breaking points.

Question 9

Ignition switch positions:

Answer 9

Off - Left - Right - Both

Question 10

Produces the highest amount of voltage in the rotation of the magneto magnet:

Answer 10

Efficiency gap (E-Gap)

Question 11

These components of a magneto must be timed together:

Answer 11

1) Magnet
2) Cam
3) Distributor Finger

Question 12

Magneto manufacturers:

Answer 12

1) Bendix
2) Slick

Question 13

Used to reduce chance of arcing in magnetos:

Answer 13

Upper deck air

Question 14

Arcing from distributor finger to the wrong distributor terminal is called:

Answer 14

Flash over

Question 15

Numbers on the magneto indicate what?

Answer 15

Firing order of plugs.

Question 16

The coupling on a base mount magneto:

Answer 16

Vernier coupling.

Question 17

Retards the timing of the spark to increase intensity at start up:

Answer 17

Impulse coupling

Question 18

A result of breaker point erosion and cam wear:

Answer 18

Magneto drift

Question 19

Types of magneto mounts:

Answer 19

Flange mount
Base mount

Question 20

Causes of spark plug fouling:

Answer 20

Carbon
Dirt
Fuel lead
Over priming
Rich mixture at idle/takeoff

Question 21

Stopped by plug resistor:

Answer 21

Capacitance after firing

Question 22

Problem with spark plug reach being too long:

Answer 22

Preignition of incandescent threads.
Carbon build up on threads

Question 23

Problem with plug reach being too short:

Answer 23

Reduced exposure to fuel/air charge.
Plug fouls faster in the recessed area around plug.

Question 24

Drawback of magnetos:

Answer 24

Does not produce a hot enough spark at low RPM during startup.

Question 25

Name the two types of engine magneto systems:

Answer 25

1) High tension
2) Low tension

Question 26

The wire from the breaker points to the ignition switch is called:

Answer 26

P-lead (primary lead)

Question 27

When is flash over most likely to occur?

Answer 27

During high altitude operation, due to low dielectric strength of low air pressure.

Question 28

What is the safety gap of a magneto?

Answer 28

A location inside a magneto that allows a spark to jump to ground from the secondary circuit before the voltage rises high enough to damage the secondary insulation.

Question 29

Purpose of impulse couplings on magnetos:

Answer 29

To produce a hot, late spark for starting the engine.

Question 30

Another name for the vibrator ignition system:

Answer 30

Shower of sparks ignition system

Question 31

T/F
The spark used for starting an aircraft must occur earlier than the normal spark.

Answer 31

False.
Later.

Question 32

The _______ breaker points open last in a vibrator ignition system.

Answer 32

Retard.

Question 33

14 CFR 33.37 requires that each spark ignition engine must have what?

Answer 33

1) Dual ignition system with at least two spark plugs for each cylinder.
2) Two separate electrical circuits with separate sources of electrical energy.

Question 34

Three ways of mounting a magneto to an engine:

Answer 34

1) Base mount
2) Flange mount
3) Clamp mount

Question 35

When should magnetos be checked?

Answer 35

On each annual or 100 hour inspection.

Question 36

Things to look for when inspecting magnetos:

Answer 36

1) Oil in the housing.
2) Evidence of burning or pitting of the points.
3) Carbon tracks in the distributor block.

Question 37

Erosion of the breaker points will cause the magneto to engine timing to drift ______.

Answer 37

Early

Question 38

Wear of the cam follower will cause the magneto to engine timing to drift ______.

Answer 38

Late.

Question 39

The two components in a magneto distributor are the:

Answer 39

1) Block
2) Rotor

Question 40

What is a hot spark plug?

Answer 40

A plug with a long insulator tip which is slow to dissipate the heat.

Question 41

What is a cold spark plug?

Answer 41

A plug with a short tip which rapidly dissipates heat.

Question 42

Two types of electrodes used on aircraft spark plugs:

Answer 42

1) Massive electrodes
2) Fine-wire electrodes

Question 43

Why are dual magnetos used?

Answer 43

Improve combustion efficiency and provide redundancy for safety.

Question 44

Magneto internal timing consists of:

Answer 44

Adjusting breaker points to open at E-gap and ensuring that the distributor rotor is in position to send voltage to cylinder one.

Question 45

What malfunction in the ignition system would cause a recip engine to continue to run after the ignition switch is placed in the off position?

Answer 45

The ignition switch is not grounding the magneto primary circuit.