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M11 > ATA 06- Airframe Structures General Concepts > Flashcards

ATA 06- Airframe Structures General Concepts Flashcards

1
Q

Is a vertical plane at a right angle to the body centerline?

A

Body Station

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2
Q

Are vertical planes parallel to the body centerline plane?

A

Body Buttock Line

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3
Q

Are horizontal planes at a right angle to the body stations and the body buttock lines?

A

Body Waterlines

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4
Q

On Boeing 747, what is the distance of Body waterline 0 from the lower fuselage?

A

91 inches

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5
Q

On Airbus 320, what is the distance for the Fuselage Datum which is the point zero on the Z axis?

A

240 milllimeters above the floor beams

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6
Q

On Airbus 320, what is the distance value for the Station Zero on X axis?

A

2540 millimeters in front of the nose

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7
Q

Aircraft Zoning

A

100- Lower fuselage,
200 - Upper Fuselage,
300 - Empennage,
400 - powerplant
500 - Left Wing,
600 -Right Wing,
700- Landing Gear,
800- Doors

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8
Q

Aircraft Zoning is divided into three groups

A

1st Digit - Major Zones,
2nd Digit - Sub-Major Zones,
3rd Digit - Zones

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9
Q

How are the zones numbered?

A

Usually numbered from Forward to Aft, Inboard to Outboard, and Bottom to Top

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10
Q

If more subdivisions of a zone are necessary to identify doors and panels, what codes do we use?

A

We use Letters after the Zone numbers.

First Letter is the position of panels or doors from Forward to Aft, Inboard to Outboard, and Bottom to Top.

Second Letter is the orientation ofpanels or doors if it is in the left or right side

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11
Q

What are the main structural units of aircraft?

A

Fuselage, Wings, Stabilizers, Flight Control Surfaces, Landing Gears

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12
Q

What are the 5 Major type of stress?

A

Tension, Compression, Torsion, Shear,
Bending

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13
Q

What structures contributes significantly to carrying flight, ground, and pressurization loads?

A

Primary Structures

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14
Q

What design concept method relies upon a duplication of certain structural members to ensure that if one member fails, the other would assume the load of the failed member?

A

Fail Safe

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15
Q

This design principle requires that major
structural elements are replaced after a fixed number of flight cycles, these parts cannot be repaired or refurbished to extend the components life?

A

Safe Life

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16
Q

Reference point for Z axis

A

240mm above the floorbeams

17
Q

Right angle to the body centerline

A

Body station

18
Q

On boeing 747, distance of nacelle station zero

A

197.5 inches in front of the forward engine mount

19
Q

This is a phenomenon in the aircraft structure materials where metals are weakened by the number of cycles

A

Fatigue

20
Q

What is the stress in the structures caused by two forces pulling it apart

A

Tension

21
Q

Construction made of members such as beams, struts, and bars to resist deformation by applied loads

A

Truss-type construction

22
Q

What is this type of fuselage construction where the frames are joined together by the stringers and skin with clips

A

Semi-monocoque

23
Q

Different coordinates of BOEING

A

Body station, body buttock line, body waterline

24
Q

Different coordinates of Airbus

A

X, Y, Z coordinates

25
Q

Where do you find the zero X axis

A

2540mm from the radome/nose

26
Q

Different major zones of aircraft

A

a. 100 lower fuselage
b. 200 upper fuselage
c. 300 Empennage
d. 400 Powerplant ——————
e. 500 Left wing
f. 600 right wing
g. 700 landing gear
h. 800 doors

27
Q

How do we distribute the second digit of aircraft zoning

A

Odd numbers on the left, even number on the right

28
Q

Third digit of aircraft zoning

A

Forward to aft, Inboard to outboard, Bottom to top

29
Q

A design principle that requires major structural elements to be replaced after a fixed number of flight cycles

A

Safe life

30
Q

What is the basis for the safe life design principle

A

Fatigue analysis

31
Q

Duplication of certain structural members to ensure that if one member fails, the other would assume the load of the failed member

A

Fail safe

32
Q

Improves fail-safety by considering multiple site cracking. Damage is detected and repaired back to its original strength

A

Damage tolerance

33
Q

Combination of compression and tension

A

Bending

34
Q

Stress that resist crashing force

A

Compression

35
Q

Type of structure classification that carry flight, ground, and pressurization loads

A

Primary structures

36
Q

Type of structure classification that carries only air and inertial loads

A

Secondary structures

37
Q

is measured by the distance from a point in front of the nose of the aircraft.

A

Body station

38
Q

To define locations for the installation of components and equipment in the cabin or cockpit, the manufacturers use a reference plane.

A

fixed waterline along the top surface of the floor beams.

M11 (14 decks)

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