(AD) AVIATION MACHINIST MATE WEEK 2 (ACTUAL
2025/2026) LATEST WITH COMPLETE VERIFIED SOLUTION
Electricity
The physical phenomena arising from the existence and interaction of
an electrical charge
Voltage / Electromotive Force (EMF)
The amount of force being applied to a circuit to produce an electron
flow
Amperage / Current Flow
The quantity of electricity flowing through the circuit
Oil Pressure Indicator
Displays oil pressure in pounds-per-square-inch (PSI)
Engine Fire Detection System's Components
Fire Detection Element and Fire Warning Light
Fire Detection Element
,Senses an overheat condition or fire and transmits a signal to the
flight station / cockpit
Fire Warning Light
(1) Receives its signal from the fire detection element to illuminate
the flight station / cockpit
(2) When the temperature in the engine cavity reaches an overheat
condition, the sensors will provide a signal, allowing a small current
to flow, which is transmitted to illuminate the fire warning light
Engine Starting System's Purpose
Provides initial rotation to accelerate the engine to the point where
ignition can be accomplished and sustained
Engine Ignition System's Type
High Energy Capacitor Discharge: Spark must be constant under
varying conditions
Engine Ignition System Components
Input Leads, Transformer (Exciter), Ignitor Leads, and Ignitor Plugs
,Input Leads
Delivers input power from the aircraft electrical system, or from an
external power source, to the transformer
Transformer (Exciter)
Steps up the input voltage to the rated output voltage.
Ignitor Leads
Delivers power to ignitor plugs
Ignitor Plugs
Provides and air gap for voltage arc
Auxiliary Power Unit Description
A small gas turbine engine located within the airframe of the aircraft
Auxiliary Power Unit Purposes
Supplies bleed air (pneumatic power) for:
(1) Main engine starting, which is available at the start bypass valve.
, (2) Aircraft air conditioning, which is available at the pneumatic
power source outlet
The APU also supplies electrical and hydraulic sources of power to
operate selected aircraft systems, which are used:
(1) During ground maintenance allowing the aircraft to be
independent of support equipment
(2) For emergency electrical and hydraulic power while in flight
Additionally, the APU supplies mechanical power, which is available
as shaft power at the main output drive pad
APU Assemblies
Power Section Assembly and Gearbox Assembly
Power Section Assembly
Compressor, Combustion, and Turbine
Compressor Section
(1) Is a centrifugal compressor
2025/2026) LATEST WITH COMPLETE VERIFIED SOLUTION
Electricity
The physical phenomena arising from the existence and interaction of
an electrical charge
Voltage / Electromotive Force (EMF)
The amount of force being applied to a circuit to produce an electron
flow
Amperage / Current Flow
The quantity of electricity flowing through the circuit
Oil Pressure Indicator
Displays oil pressure in pounds-per-square-inch (PSI)
Engine Fire Detection System's Components
Fire Detection Element and Fire Warning Light
Fire Detection Element
,Senses an overheat condition or fire and transmits a signal to the
flight station / cockpit
Fire Warning Light
(1) Receives its signal from the fire detection element to illuminate
the flight station / cockpit
(2) When the temperature in the engine cavity reaches an overheat
condition, the sensors will provide a signal, allowing a small current
to flow, which is transmitted to illuminate the fire warning light
Engine Starting System's Purpose
Provides initial rotation to accelerate the engine to the point where
ignition can be accomplished and sustained
Engine Ignition System's Type
High Energy Capacitor Discharge: Spark must be constant under
varying conditions
Engine Ignition System Components
Input Leads, Transformer (Exciter), Ignitor Leads, and Ignitor Plugs
,Input Leads
Delivers input power from the aircraft electrical system, or from an
external power source, to the transformer
Transformer (Exciter)
Steps up the input voltage to the rated output voltage.
Ignitor Leads
Delivers power to ignitor plugs
Ignitor Plugs
Provides and air gap for voltage arc
Auxiliary Power Unit Description
A small gas turbine engine located within the airframe of the aircraft
Auxiliary Power Unit Purposes
Supplies bleed air (pneumatic power) for:
(1) Main engine starting, which is available at the start bypass valve.
, (2) Aircraft air conditioning, which is available at the pneumatic
power source outlet
The APU also supplies electrical and hydraulic sources of power to
operate selected aircraft systems, which are used:
(1) During ground maintenance allowing the aircraft to be
independent of support equipment
(2) For emergency electrical and hydraulic power while in flight
Additionally, the APU supplies mechanical power, which is available
as shaft power at the main output drive pad
APU Assemblies
Power Section Assembly and Gearbox Assembly
Power Section Assembly
Compressor, Combustion, and Turbine
Compressor Section
(1) Is a centrifugal compressor
