11.3 E Nacelles And Pylons

Question 1

What is the housing unit that typically encloses an aircraft engine called?
A. Turret
B. Nacelle
C. Podium

Answer 1

B. Nacelle

Question 2

What isolates the aircraft engine from the wing or fuselage to enhance safety?
A. Insulation foam
B. Firewalls or fire shields
C. Cooling fans

Answer 2

B. Firewalls or fire shields

Question 3

What is the main structural component of a pylon called that contains the engine attachment fittings?
A. Firewall
B. Torque box
C. Fairing

Answer 3

B. Torque box

Question 4

What types of loads do the forward pylon attachment fittings primarily transmit?
A. Longitudinal and aerodynamic
B. Weight and lateral
C. Electrical and hydraulic

Answer 4

B. Weight and lateral

Question 5

What is the primary purpose of a nacelle on an aircraft?
A. To carry passengers
B. To house the engine and accessories
C. To store fuel

Answer 5

B. To house the engine and accessories

Question 6

What are the large panels called that surround and streamline the engine?
A. Skids
B. Cowls
C. Pods

Answer 6

B. Cowls

Question 7

What type of metal is typically used on nacelle surfaces near exhaust exits due to high temperatures?
A. Copper
B. Stainless steel or titanium alloys
C. Lead

Answer 7

B. Stainless steel or titanium alloys

Question 8

What is another common name for a nacelle?
A. Canopy
B. Pod
C. Shell

Answer 8

B. Pod

Question 9

What feature is often added to modern nacelles to help reduce engine noise?
A. Air vents
B. Acoustic lining and serrated edges
C. Extra insulation foam

Answer 9

B. Acoustic lining and serrated edges

Question 10

What does the fan cowl support beam do?
A. Stores fuel for the engine
B. Supports the fan cowl and distributes loads to the torque box
C. Controls airflow into the engine

Answer 10

B. Supports the fan cowl and distributes loads to the torque box

Question 11

How is the fan cowl attached to the fan cowl support beam?
A. Welded
B. Bolted
C. Hinged with quick-release pins

Answer 11

C. Hinged with quick-release pins

Question 12

What is the purpose of the wing-to-nacelle fairings?
A. To reduce engine noise
B. To provide a low-drag aerodynamic profile between the engine nacelle and the wing
C. To support the engine

Answer 12

B. To provide a low-drag aerodynamic profile between the engine nacelle and the wing

Question 13

How long must firewall materials resist flame penetration according to regulations?
A. 5 minutes
B. 10 minutes
C. 15 minutes

Answer 13

C. 15 minutes

Question 14

What is the purpose of a flameproof bulkhead (firewall) in an aircraft?
A. To support the engine
B. To separate the engine compartment from the rest of the aircraft and prevent flame penetration
C. To reduce fuel consumption

Answer 14

B. To separate the engine compartment from the rest of the aircraft and prevent flame penetration

Question 15

What must the firewall prevent from passing through to other parts of the aircraft?
A. Oxygen and any fuel from leaking from the tank

What must the firewall prevent from passing through to other parts of the aircraft?
A. Oxygen
B. Hazardous quantity of liquid, gas, or flame
C. Carbon dioxide

C. Carbon dioxide from getting to the fire and making it worst

Answer 15

B. Hazardous quantity of liquid, gas, or flame

Question 16

What must all aircraft firewalls and shrouds be?
A. Waterproof
B. Fireproof
C. Shockproof

Answer 16

B. Fireproof

Question 17

What must firewalls prevent from passing to other parts of the aircraft?
A. Air
B. Electrical signals
C. Hazardous liquid, gas, or flame

Answer 17

C. Hazardous liquid, gas, or flame

Question 18

How must openings in firewalls be sealed?
A. With glue
B. With close-fitting, fireproof grommets or fittings
C. With foam seals

Answer 18

B. With close-fitting, fireproof grommets or fittings

Question 19

What protection must firewalls have in addition to fire resistance?
A. Paint coating
B. Anti-vibration
C. Corrosion protection

Answer 19

C. Corrosion protection

Question 20

What are firewalls made from to resist high engine temperatures?
A. Aluminium and plastic
B. Stainless steel, Inconel, or titanium
C. Wood and copper

Answer 20

B. Stainless steel, Inconel, or titanium

Question 21

What do flameproof panels and diaphragms help prevent?
A. Engine noise
B. Vibration
C. Spread of flames through the engine

Answer 21

C. Spread of flames through the engine

Question 22

What should be inspected when checking a firewall?
A. Only the top edge
B. Paint color
C. Condition, security, cracking, grommets, and sealant

Answer 22

C. Condition, security, cracking, grommets, and sealant

Question 23

What must be done if a fire shield or heat blanket is worn or damaged?
A. Leave it until next inspection
B. Patch it with tape
C. Replace it

Answer 23

C. Replace it

Question 24

What is the main purpose of an engine mount?
A. Store fuel
B. Connect the engine to the aircraft and manage vibrations
C. Increase engine speed

Answer 24

B. Connect the engine to the aircraft and manage vibrations

Question 25

What is the main purpose of shock mounts (flexible engine suspension units)? A. Increase engine power B. Prevent overheating C. Absorb engine vibrations

Answer 25

C. Absorb engine vibrations

Question 26

What additional stress affects the entire engine mount bolts when the aircraft is airborne? A. Compressive stress B. Torsional stress C. Thermal stress

Answer 26

B. Torsional stress

Question 27

How is the engine typically attached to the mount in aircraft using dynafocal mounts? A. By bolts placed at the rear of the engine B. Using dynafocal mounts at the engine’s centre of gravity, forward of the mounting ring C. With rigid brackets directly to the fuselage

Answer 27

B. Using dynafocal mounts at the engine’s centre of gravity, forward of the mounting ring

Question 28

What is the purpose of the mounting pad angle in dynafocal engine mounts? A. To align the mount with the aircraft fuselage B. To reduce engine vibrations during flight C. To point to the Centre of Gravity (CG) of the engine’s mass

Answer 28

C. To point to the Centre of Gravity (CG) of the engine’s mass

Question 29

How do engine mounts for turbofan engines function? A. They only support the rear end of the engine B. They transmit loads from the engine to the aircraft structure C. They are only used to isolate engine vibrations

Answer 29

B. They transmit loads from the engine to the aircraft structure

Question 30

What is the primary function of the forward turbine vibration isolator engine mounts? A. To support only vertical loads B. To support vertical, side, and axial (thrust) loads while allowing thermal expansion C. To only accommodate thermal expansion without supporting any loads

Answer 30

B. To support vertical, side, and axial (thrust) loads while allowing thermal expansion