Chapter 3 - Subsidary Airframe Structures

Question 1

Passenger Cabin Windows

Answer 1

• 3 Layers
• Made from acrylic
• Middle and Outer layer can both take full pressurisation if one fails

-Can withstand 1.5x normal operating pressure.

Question 2

Eye Reference Position

Answer 2

The flight crew must adjust seats to the design eye point.

3 Balls in the centre of the cockpit. Only 2 should be viewable when correctly sat.

CS25 - Requires aircraft to be fitted with aids to ensure good eye position.

Question 3

Front Cockpit Window makeup?

Answer 3

Glass Layer
Vinyl (Conductive coating)
Glass Layer

• Front window is the thickest.
• Vinyl catches any glass shards.

Question 4

Side Panel Window make up (Cockpit)?

Answer 4

Stretch Acyclic
Phenolic Spacer
Stretch Acyclic

Question 5

CS25 - Windows cockpit windows rule?

Answer 5

Must be a direct vision window capable of being opened in flight when the aircraft is unpressurised.

Question 6

The front cockpit window can withstand up to a ___ Lb bird impact.

Answer 6

The front cockpit window can withstand up to a 4 Lb bird impact.

Question 7

Flight Deck Windows Must have:

Answer 7

• Excellent optical qualities
• Must be able to seal for pressurisation
• Be able to handle large temperature differences
• Be able to absorb impacts without failure.
• De-icing / De-misting capabilities
• Shouldn’t bend excessively when heated (Mailable) Somewhat flexible to help absorb impacts.

Question 8

Red Flag through inspection window?

Answer 8

Door Unlocked (Unpressurised)

Question 9

Green Flag through inspection window?

Answer 9

Door Locked (Pressurised)

Question 10

Cargo Doors characteristics?

Answer 10

• Usually hinged along their top edge and open directly outwards and upwards.

Question 11

How are Cargo Doors secured?

Answer 11

• By over-centre locks and pressurisation interlocks.

- Sealed with inflatable seal or rubber cuff.

Question 12

What is a Plug Door?

Answer 12

• Access door which uses tapered edges to fit snugly in tapered door frame.
• When closed the door must first come inwards then outwards.
• Unless depressurised the door CANNOT be opened (Even in emergency evacuations door must first be unpressurised).

Question 13

Over Wing Exit Doors

Answer 13

• Some Hinge outwards
• Require complex latching and locking mechanisms to ensure they can withstand pressurisation force, and not be opened unnecessarily.

Question 14

Light Aircraft Doors

Answer 14

Often hinged on forward edge in unpressurised aircraft.

• If door is accidentally left opened, the natural airstream should keep it near closed.

Question 15

Light Aircraft Floor

Answer 15

• Can be formed as an integral part of the shell halves which make up the fuselage
• Can be part of the wing surface which travels through the cabin

Question 16

Blow out panels?

Answer 16

The floors have vents and blow-out panels to equalise the pressure in the case of depressurisation.