AUXILIARY

What are the two different types of air mixed in the compressor stage of a turbine engine.

Ambient air is mixed with bleed air.

The mixture of ambient and bleed air is propelled into the aircraft cabin by a constant ____________________.

R.P.M. blower.

Pressurized aircraft that use air cycle air conditioning systems mix _________ with cold air produced by the air cycle machine expansion turbine to obtain warm air for the cabin.

Bleed Air Systems

AIRCRAFT AIR DUCTS
The mixing of air can be done in a variety of ways:

•       Mixing air valves

•       flow control valves

•       shutoff valves

•       various control valves controlled by switches in the cockpit

Bleed air heat system uses_________________ in helicopter cabins to combine bleed air with cabin air. All of these bleed air heating systems are simple and function well, as long as the valves, ducting, and controls are in operational condition

Bleed air heat system uses mini-ejectors in helicopter cabins to combine bleed air with cabin air. All of these bleed air heating systems are simple and function well, as long as the valves, ducting, and controls are in operational condition

Require a significant amount of the aircraft’s generator output, which is better dedicated to the operation of other electrical devices. For this reason, they are not very common.
A. Bleed air Systems

B. Electric Heating System

C. Exhaust Shroud System

D. Combustion Heaters

B. Electric Heating System

Most single-engine light aircraft use ___________________ to heat the cabin. Ambient air is directed into a metal shroud, or jacket, that encases part of the engine’s__________.

The air is warmed by the exhaust and directed through a firewall heater valve into the cabin. This simple solution requires no electrical or engine power and it makes use of heat that would otherwise be wasted.

A. Exhaust Shroud System

B. Electric Heating System

C. Bleed air Systems

D. Combustion Heaters

A. Exhaust Shroud System

A major concern of exhaust shroud heat systems is the possibility that exhaust gases could contaminate the cabin air by ________________.

A. Carbon Dioxide

B. Carbon Monoxide

C. Dust

D. Corrosion

B. Carbon Monoxide

Most involve pressurizing the exhaust system with air, while inspecting for leaks with a _________________.

A. Powdered Solution

B. Dye penetrant

C. Soapy Solution

C. Soapy Solution

Some require the exhaust to be removed and pressurized while submerged under water to detect any leaks. Frequency of exhaust heat leak detection can be every ___________.

A. 50 hours

B. 100 hours.

C. Annual inspection.

B. 100 hours.

What is the Disadvantage of welded studs in exhaust shroud?

A. Air Leaks

B. Corrosion

C. Prone to dirt accumulation.

A. Air Leaks

is used on many small to medium sized aircraft. It is a heat source independent from the aircraft’s engine(s), although it does use fuel from the aircraft’s main fuel system.

are similar to exhaust shroud heaters in that ambient air is heated and sent to the cabin.

A. Bleed air Systems

B. Electric Heating System

C. Exhaust Shroud System

D. Combustion Heaters

D. Combustion Heaters

the name of the air that is warmed and sent into the cabin. Typically, it comes into the combustion heater through a ram air intake.

A. Bleed air Systems

B. Ventilating Air System

C. Ignition System

D. Combustion Heaters

B. Ventilating Air System

When the aircraft is ___________________, a ventilating air fan controlled by a landing gear squat switch operates to draw in the air. Once ______________, the fan ceases to operate as the ram air flow is sufficient.

When the aircraft is on the ground, a ventilating air fan controlled by a landing gear squat switch operates to draw in the air. Once airborne, the fan ceases to operate as the ram air flow is sufficient.

consist of a cabin heat switch and a thermostat.

combustion heater controls

Safety Features:
A duct limit switch cuts off fuel to the heater when there is not enough airflow to keep the heater duct below a preset temperature.

An overheat switch set at a higher temperature than the duct limit switch guards against overheat of any kind. It is designed to cut fuel to the combustion heater before an unwanted fire occurs.

MAINTENANCE AND INSPECTION OF COMBUSTION HEATERS

Maintenance of combustion heaters consists of routine items, such ____________________, _________________________, and ________________ .All maintenance and inspection of combustion heaters should be accomplished in accordance with the aircraft manufacturer’s instructions.

Maintenance of combustion heaters consists of routine items, such as cleaning filters, checking spark plug wear, and ensuring inlets are not plugged. All maintenance and inspection of combustion heaters should be accomplished in accordance with the aircraft manufacturer’s instructions.

also called air-conditioning systems, are used to reduce the temperature inside an aircraft for crew and passenger comfort.

A. Aircraft-cooling Systems

B. Vapor Cycle Cooling System

C. Air Cycle Cooling System

A. Aircraft-cooling Systems

The two basic methods of reducing the temperature of aircraft are the _____________________________________.

Freon Vapor - Cycle machine and the Air -Cycle Machine.

Cycle Machine is a closed system using the evaporation and condensation of Freon to remove heat from the cabin interior.

A. The Air

B. The Bleed Air

C. The Vapor

D. The Condensation

C. The Vapor

Cycle Machine uses the compression and expansion of air to lower the temperature of the cabin air.

A. The Air

B. The Bleed Air

C. The Vapor

D. The Condensation

A. The Air

CABIN – COOLING SYSTEM
Cools the engine/APU bleed air.

A. PRIMARY HEAT EXCHANGER 

B. SECONDARY HEAT EXCHANGER 

C. OIL COOLING SYSTEM

D. AIR COOLING SYSTEM

A. PRIMARY HEAT EXCHANGER 

CABIN – COOLING SYSTEM

Removes the heat of compression of the ACM.

A. PRIMARY HEAT EXCHANGER 

B. SECONDARY HEAT EXCHANGER 

C. OIL COOLING SYSTEM

D. AIR COOLING SYSTEM

B. SECONDARY HEAT EXCHANGER 

is the refrigeration unit of the environmental control system (ECS) used in pressurized gas turbine-powered aircraft.

A. REFRIGERANT

B. VAPOR CYCLE COOLING SYSTEM

C. FREON VAPOR - CYCLE MACHINE

D. AIR CYCLE MACHINE

D. AIR CYCLE MACHINE

Normally an aircraft has how many of these ACM?? 

two or three

is used in reciprocating-engine-powered aircraft and in smaller turboprop aircraft that do not make use of air-cycle machines to reduce the cabin interior temperature.

A. REFRIGERANT

B. VAPOR CYCLE COOLING SYSTEM

C. FREON VAPOR - CYCLE MACHINE

D. AIR CYCLE MACHINE

B. VAPOR CYCLE COOLING SYSTEM

Conversely, as heat is extracted from a gas it becomes a __________________________.This heat is called the latent heat of vaporization. 

Conversely, as heat is extracted from a gas it becomes a liquid and then a solid.

When a gas is compressed, its temperature ____________, and when the pressure on a gas is decreased, its temperature _____________.

When a gas is compressed, its temperature increases, and when the pressure on a gas is decreased, its temperature decreases.

One heat exchanger works in a fashion similar to the one previously discussed, taking heat from the closed system, and is called an _________________. The other heat exchanger draws heat from the air and adds it to the closed system. This heat exchanger is called a ______________.

One heat exchanger works in a fashion similar to the one previously discussed, taking heat from the closed system, and is called an evaporator. The other heat exchanger draws heat from the air and adds it to the closed system. This heat exchanger is called a condenser.

It is a gas at standard pressure and temperature but becomes a liquid when its pressure is increased sufficiently or when the temperature is reduced to the required level.

A. REFRIGERANT 12

B. VAPOR CYCLE COOLING SYSTEM

C. FREON VAPOR - CYCLE MACHINE

D. AIR CYCLE MACHINE

A. REFRIGERANT 12, also known as Freon 12

The ______________ is the source of energy required for the operation of the vapor cycle system.

A. Compressor

B. Condenser

C. Evaporator

D. ACM

A. Compressor

The ___________________ is essentially a reservoir containing a filter and a desiccant. 

The receiver-dryer-filter is essentially a reservoir containing a filter and a desiccant. 

Modern large turbine-powered aircraft make use of air cycle machines to adjust the temperature of the air directed into the passenger and crew compartments of these large aircraft.

utilize the same principles of thermodynamics and the same laws of gases involved in vapor-cycle systems.

A. REFRIGERANT

B. VAPOR CYCLE COOLING SYSTEM

C. FREON VAPOR - CYCLE MACHINE

D. AIR CYCLE COOLING SYSTEM

D. AIR CYCLE COOLING SYSTEM

is the valve that regulates bleed air from the pneumatic manifold into the air cycle air conditioning system. It is controlled with a switch from the air conditioning panel in the cockpit.

A. Bleed Air Bypass

B. Pack Valve

C. Water Separator

B. Pack Valve

A means for bypassing some of the pneumatic air supplied to the air cycle air conditioning system around the system is present on all aircraft.

A. Bleed Air Bypass

B. Pack Valve

C. Water Separator

A. Bleed Air Bypass

is used to remove the water from the saturated air before it is sent to the aircraft cabin.

coalesces and removes water by swirling the air/water mixture from ACM expansion turbine. Centrifugal force sends the water to the walls of the collector where it drains from the unit

A. Bleed Air Bypass

B. Pack Valve

C. Water Separator

C. Water Separator

regulates the temperature of the ACM discharge air so it does not freeze when passing through the water separator.

A. CABIN TEMPERATURE CONTROL SYSTEM

B. BASIC VAPOR CYCLE

C. REFRIGERATION BYPASS VALVE

D. PACK VALVE

C. REFRIGERATION BYPASS VALVE

is the pressure of the vapor that exists above a liquid that is in an enclosed container at any given temperature.

A. Vapor pressure

B. Basic Vapor

C. Air Pressure

A. Vapor pressure

TRUE OR FALSE:

VAPOR CYCLE COOLING SYSTEM Modern large turbine-powered aircraft make use of air cycle machines to adjust the temperature of the air directed into the passenger and crew compartments of these large aircraft.

FALSE (AIR CYCLE COOLING SYSTEM)

The Compressor is the source of energy required for the operation of the vapor cycle system.

TRUE

Normally an aircraft has two or three of these ACM.

TRUE

When a gas is compressed, its temperature decrease, and when the pressure on a gas is decreased, its temperature decrease.

FALSE (INCREASE)

Refrigerant is the refrigeration unit of the environmental control system (ECS) used in pressurized gas turbine-powered aircraft.

FALSE (AIR CYCLE MACHINE)

Bleed air Systems is the name of the air that is warmed and sent into the cabin. Typically, it comes into the combustion heater through a ram air intake.

FALSE (Ventilating Air System)

A major concern of exhaust shroud heat systems is the possibility that exhaust gases could contaminate the cabin air by Carbon Monoxide.

TRUE

FREON VAPOR - CYCLE MACHINE is used in reciprocating-engine-powered aircraft and in smaller turboprop aircraft that do not make use of air-cycle machines to reduce the cabin interior temperature.

FALSE (VAPOR CYCLE COOLING SYSTEM)

REFRIGERANT 12 It is a gas at standard pressure and temperature but becomes a liquid when its pressure is increased sufficiently or when the temperature is reduced to the required level.

TRUE

Vapor pressure is the pressure of the vapor that exists above a liquid that is in an enclosed container at any given temperature.

TRUE

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Ma’am Rutao 2022 - 2023