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M11✅ > 11.3 AEROPLANE STRUCTURES > Flashcards

11.3 AEROPLANE STRUCTURES Flashcards

1
Q

What are the 3 aircraft fuselage constructions?

A

Truss type (Pratt or Warren)
Monocoque type
Semi-monocoque type

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2
Q

Pratt truss ?

A

→ wooden longerons (main longitudinal structural members)
→ Longerons supported by wooden struts

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3
Q

Warren Truss ?

A

→ Longerons connected with diagonal members
→ carry both tension and compression

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4
Q

How is a fuselage pressurised ?

A
  • Air pumped into cabin after take off
  • Results in difference outside/inside cabin pressure
  • Differential pressure is regulated/maintained throughout flight
  • Causes significant stresses leading to metal fatigue
  • Semi-Monocoque construction
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5
Q

2 sealant application methods on aircraft fuselage ?

A
  • Faying seal (2 metals overlap)
  • Fillet seal (corner)
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6
Q

Why must electrical and flying control cable must be sealed ?

A
  • prevent excessive pressure leaks as they pass through pressure bulkheads
  • rubber, silicon seals or sealant plates
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7
Q

Common fuselage on modern day aircraft ?

A
  • Semi-monocoque construction
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8
Q

What is a stressed skin fuselage

A

All loads carried in the exterior skin

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9
Q

How are electrical cables and flying control cables sealed to prevent excessive pressure leaks

A

Special designed rubber or silicon seals used

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10
Q

What is the pylons structural purpose

A

Transfers thrust generated by engines to airframe

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11
Q

Passengers and flight crew seats are secured to longitudinal tracks using what type of fasteners

A

Quick release fasteners

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12
Q

What are the seat tracked bolted/riveted to

A

Floor beam

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13
Q

Cargo loading system components include

A

-transport components
- guidance components
- locking components

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14
Q

What type of door is the ‘main entry doors’

A

Plug type

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15
Q

What type of door is a ‘service door’ e.g. potable water system

A

Non plug type

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16
Q

What type of door are cargo doors

A

Non Plug type

17
Q

Explain plug type door

A
  • Seal itself by utilising differential pressure
  • One side has higher pressure so it wedges it in
18
Q

Explain non-plug type door

A

Open outwards and use locking mechanisms such as latches

19
Q

What are the left doors of the aircraft usually used for

A

Passenger entry

20
Q

What are the right doors of the aircraft usually used for

A

Galley servicing

21
Q

If a door is incorrectly latched/open is a warning given to a flight crew

A

Yes

22
Q

What do the door frame house

A

Pressure stop fittings

23
Q

What is the function of the pressure stop fittings and how is it achieved

A

Holds the door closed when cabin is pressurised

By a ‘stop pin’

24
Q

How are door seals held in place

A

Adhesive compounds, screws

25
Q

> than 45,500 kg/> than 60 passenger seating capacity shall be equipped with what

A

-compartment door between cabin and flight deck

26
Q

Should the aircraft door be opened if the cabin pressure ‘indicator’ is lit

A

No, risk of door violently opening and injuring outside personnel

27
Q

What are safety gags used for

A

Prevent hydraulic actuation of cargo doors

28
Q

What do witness points indicate on cargo door

A

If latches have been fully engaged

29
Q

What device are doors usually fitted with to ensure they are securely locked for flight

A

Proximity devices

30
Q

What are doors usually fitted with to ensure they are securely locked for flight

A

Proximity devices

31
Q

Explain passenger windows

A
  • plug type
  • made of acrylic plastic
  • 2 layers of acrylic plastic for failsafe reasons
32
Q

Explain flight deck windows

A
  • usually 6 flight deck windows
  • constructed from laminations of tempered glass and plastic
  • electrically heated
  • silicon seal in between windows and frame to bond
33
Q

What do you inspect for window damage

A
  • Delamination and bubbles
  • chips, cracking, scratches
34
Q

What does the keel beam support

A
  • wheel well area

M11✅ (17 decks)

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