ATA 06- Airframe Structures General Concepts

Question 1

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

Answer 1

Body Station

Question 2

Are vertical planes parallel to the body centerline plane?

Answer 2

Body Buttock Line

Question 3

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

Answer 3

Body Waterlines

Question 4

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

Answer 4

91 inches

Question 5

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

Answer 5

240 milllimeters above the floor beams

Question 6

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

Answer 6

2540 millimeters in front of the nose

Question 7

Aircraft Zoning

Answer 7

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

Question 8

Aircraft Zoning is divided into three groups

Answer 8

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

Question 9

How are the zones numbered?

Answer 9

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

Question 10

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

Answer 10

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

Question 11

What are the main structural units of aircraft?

Answer 11

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

Question 12

What are the 5 Major type of stress?

Answer 12

Tension, Compression, Torsion, Shear,
Bending

Question 13

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

Answer 13

Primary Structures

Question 14

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?

Answer 14

Fail Safe

Question 15

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?

Answer 15

Safe Life

Question 16

Reference point for Z axis

Answer 16

240mm above the floorbeams

Question 17

Right angle to the body centerline

Answer 17

Body station

Question 18

On boeing 747, distance of nacelle station zero

Answer 18

197.5 inches in front of the forward engine mount

Question 19

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

Answer 19

Fatigue

Question 20

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

Answer 20

Tension

Question 21

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

Answer 21

Truss-type construction

Question 22

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

Answer 22

Semi-monocoque

Question 23

Different coordinates of BOEING

Answer 23

Body station, body buttock line, body waterline

Question 24

Different coordinates of Airbus

Answer 24

X, Y, Z coordinates

Question 25

Where do you find the zero X axis

Answer 25

2540mm from the radome/nose

Question 26

Different major zones of aircraft

Answer 26

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

Question 27

How do we distribute the second digit of aircraft zoning

Answer 27

Odd numbers on the left, even number on the right

Question 28

Third digit of aircraft zoning

Answer 28

Forward to aft, Inboard to outboard, Bottom to top

Question 29

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

Answer 29

Safe life

Question 30

What is the basis for the safe life design principle

Answer 30

Fatigue analysis

Question 31

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

Answer 31

Fail safe

Question 32

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

Answer 32

Damage tolerance

Question 33

Combination of compression and tension

Answer 33

Bending

Question 34

Stress that resist crashing force

Answer 34

Compression

Question 35

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

Answer 35

Primary structures

Question 36

Type of structure classification that carries only air and inertial loads

Answer 36

Secondary structures

Question 37

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

Answer 37

Body station

Question 38

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

Answer 38

fixed waterline along the top surface of the floor beams.