PART 1 | ATA 06- Airframe Structures General Concepts

Question 1

Right angle to the body centerline

Answer 1

Body station

Question 2

Parallel to the body centerline

Answer 2

Body buttock line

Question 3

Reference point for Z axis

Answer 3

240mm above the floorbeams

Question 4

Distance of nacelle station zero

Answer 4

197.5 in front of the forward engine mount

Question 5

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

Answer 5

Fatigue

Question 6

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

Answer 6

Tension

Question 7

Construction made of members such as beams

Answer 7

struts

Question 8

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

Answer 8

Semi-monocoque

Question 9

Different coordinates of BOEING

Answer 9

Body station, body buttock line, body waterline

Question 10

Different coordinates of Airbus

Answer 10

X, Y, Z Coordinates

Question 11

Where do you find the zero X axis

Answer 11

2540mm from the radome/nose

Question 12

Different major zones of aircraft

Answer 12

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 13

How do we distribute the second digit of aircraft zoning

Answer 13

Odd numbers on the left,
Even numbers on the right

Question 14

Third digit of aircraft zoning

Answer 14

Forward to aft
Inboard to outboard
Bottom to top

Question 15

A design principle that requires major structural elements to be 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

What is the basis for the safe life design principle

Answer 16

Fatigue analysis

Question 17

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

Answer 17

Fail safe

Question 18

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

Answer 18

Damage tolerance

Question 19

Combination of compression and tension

Answer 19

Bending

Question 20

Stress that resist crashing force

Answer 20

Compression

Question 21

Type of structure classification that carry flight ground and pressurization loads

Answer 21

Primary structures

Question 22

Type of structure classification that carmes only air and inertial loads

Answer 22

secondary structures

Question 23

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

Answer 23

91 inches

Question 24

Aircraft Zoning is divided into three groups,

Answer 24

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

Question 25

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

Answer 25

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 of panels or doors if it is in the left or right side

Question 26

What are the main structural units of aircraft?,

Answer 26

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

Question 27

What are the main structural units of aircraft?,

Answer 27

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

Question 28

What are the 5 Major type of stress?

Answer 28

Tension, Compression, Torsion, Shear, Bending