30 Questions
Pressure bulkheads are installed to withstand ______ pressure
cabin
Stringers give shape to the fuselage shell and they are located on the inner side of the aircraft ______ panel
skin
Stringers are designed to carry loads because of the fuselage bending, shear, torsion and ______ pressure
cabin
On semi-monocoque constructions you can also find stringers attached to the frames by angle-shaped or ______-shaped clips
T
Stringers pass through cut-outs in the frame of a ______ construction
monocoque
Several pressure bulkheads form part of the pressurised cabin of a fuselage, for example, the forward pressure bulkhead and the aft pressure ______
bulkhead
CLIPS are usually found on the inner surface of the skin and are attached to the frame and also to the ______.
stringer
The main purpose of these clips is to transfer the pressure load from the skin panel to the frame and assist the frame in carrying ______ stress.
compression
FLOOR BEAMS lay horizontally and are adjacent to the skin panel. They are attached to the frames and help to carry the pressure loads across the ______.
fuselage
Floor beams are also able to support cabin pressurization and can absorb the normal loads of the seat tracks and ______ panels.
floor
Floor−to−skin shear ties extend along the 2 sides of the fuselage and are level with the floor ______.
beams
The purpose of floor−to−skin shear ties is to provide additional support and prevent ______ between the skin and the floor beams.
shearing
Republic of the Philippines PHILIPPINE STATE COLLEGE OF AERONAUTICS Institute of Engineering and Technology is located in Piccio Garden, Villamor, Pasay City. AIRCRAFT STRUCTURAL REPAIR OVERVIEW TOPIC: AIRCRAFT STRUCTURAL REPAIR OVERVIEW| Ver. 1 Rev.March 2021 Page 1 of 29 Republic of the Philippines PHILIPPINE STATE COLLEGE OF AERONAUTICS Institute of Engineering and Technology Piccio Garden, Villamor, Pasay City TOPIC: ___________
AIRCRAFT STRUCTURAL REPAIR OVERVIEW
Two kinds of typical structure assembly are used in the airbus aircraft design: Metallic principle that can be also divided into two parts: o The fuselage part structure: the skin is attached to the frames and stiffened by ___________
stringers
Two kinds of typical structure assembly are used in the airbus aircraft design: Metallic principle that can be also divided into two parts: o The wingbox part structure: the skins stiffened with stiffeners are attached to ___________
spars and ribs
Republic of the Philippines PHILIPPINE STATE COLLEGE OF AERONAUTICS Institute of Engineering and Technology is located in Piccio Garden, Villamor, Pasay City. TOPIC: AIRCRAFT STRUCTURAL REPAIR OVERVIEW| Ver. 1 Rev. March 2021 Page 2 of 29 Republic of the Philippines PHILIPPINE STATE COLLEGE OF AERONAUTICS Institute of Engineering and Technology Piccio Garden, Villamor, Pasay City ___________
STRUCTURES
Two kinds of typical structure assembly are used in the airbus aircraft design: Metallic principle that can be also divided into two parts: o The fuselage part structure: the skin is attached to the frames and stiffened by ___________
stringers
Two kinds of typical structure assembly are used in the airbus aircraft design: Metallic principle that can be also divided into two parts: o The wingbox part structure: the skins stiffened with stiffeners are attached to spars and ___________
ribs
The keel beam and the skin/stringer panels of the lower half of the forward and aft fuselage carry the ______.
loads
The fuselage center section provides part of the cabin with a structure for joining the center wing box and main landing gears together. The area underneath the cabin floor of the aircraft is ______.
unpressurized
A pressure boundary is made by the upper skin panel of the center wing box and a pressure diaphragm extends from the wing box above the main landing gears. The forward and aft pressure boundary is created by the pressure bulkheads which lie in front of the center wing box and at the end of the main landing gear ______.
bay
The fuselage center section provides part of the cabin with a structure for joining the center wing box and main landing gears together. The area underneath the cabin floor of the aircraft is ______.
unpressurized
A pressure boundary is made by the upper skin panel of the center wing box and a pressure diaphragm extends from the wing box above the main landing gears. The forward and aft pressure boundary is created by the pressure bulkheads which lie in front of the center wing box and at the end of the main landing gear ______.
bay
The fuselage center section provides part of the cabin with a structure for joining the center wing box and main landing gears together. The area underneath the cabin floor of the aircraft is ______.
unpressurized
An aircraft has 5 main structural units which consist of: - Fuselage Wings Stabilizers Flight Control Surfaces ______
Landing gears
Composite principle that can be also divided in two parts: o The sandwich part structure: inner and outer skins are made of layers of fabric or tape (carbon, aramid or glass) and honeycomb core in between (ex: landing gear doors, flight control surface), o The monolithic part structure: parts are made of layers of fabric or tape, like carbon, aramid or glass (ex: rear pressure bulkhead, vertical ______...).
stabilizer
The sandwich part structure: inner and outer skins are made of layers of fabric or tape (carbon, aramid or glass) and honeycomb core in between (ex: landing gear doors, flight ______ surface), o The monolithic part structure: parts are made of layers of fabric or tape, like carbon, aramid or glass (ex: rear pressure bulkhead, vertical stabilizer...).
control
TOPIC: AIRCRAFT STRUCTURAL REPAIR ______| Ver. 1 Rev.March 2021 Page 4 of 29 Republic of the Philippines PHILIPPINE STATE COLLEGE OF AERONAUTICS Institute of Engineering and Technology Piccio Garden, Villamor, Pasay City
OVERVIEW
TOPIC: AIRCRAFT STRUCTURAL REPAIR OVERVIEW| Ver. 1 Rev.March 2021 Page 4 of 29 Republic of the Philippines PHILIPPINE STATE COLLEGE OF AERONAUTICS Institute of Engineering and Technology Piccio Garden, Villamor, Pasay City AIRFRAME GENERAL CONCEPTS An aircraft has 5 main structural units which consist of: - Fuselage Wings Stabilizers Flight Control Surfaces Landing ______
gears
TOPIC: AIRCRAFT STRUCTURAL REPAIR OVERVIEW| Ver. 1 Rev.March 2021 Page 5 of 29 Republic of the Philippines PHILIPPINE STATE COLLEGE OF AERONAUTICS Institute of Engineering and Technology Piccio Garden, Villamor, Pasay City ______ GENERAL CONCEPTS An aircraft has 5 main structural units which consist of: - Fuselage Wings Stabilizers Flight Control Surfaces Landing gears
AIRFRAME
Study Notes
Aircraft Structures
- Two types of typical structure assemblies are used in Airbus aircraft design:
- Metallic principle
- Composite principle
- Metallic principle can be divided into two parts:
- Fuselage part structure: skin is attached to frames and stiffened by stringers
- Wingbox part structure: skins stiffened with stiffeners are attached to spars and ribs
- Composite principle can be divided into two parts:
- Sandwich part structure: inner and outer skins are made of layers of fabric or tape and honeycomb core in between
- Monolithic part structure: parts are made of layers of fabric or tape, like carbon, aramid, or glass
Airframe General Concepts
- An aircraft has 5 main structural units:
- Fuselage
- Wings
- Stabilizers
- Flight Control Surfaces
- Landing gears
- Pressure bulkheads are installed to withstand cabin pressure and are located in areas such as the nose and tail of the fuselage, the wheel well, and the wings
Fuselage Components
- Stringers:
- Give shape to the fuselage shell
- Located on the inner side of the aircraft skin panel
- Carry loads due to fuselage bending, shear, torsion, and cabin pressure
- Connected to each other by stringer splices on production breaks
- Make way only for structural openings such as windows and doors
- Clips:
- Found on the inner surface of the skin
- Attached to the frame and stringer
- Transfer pressure load from the skin panel to the frame and assist the frame in carrying compression stress
- Floor beams:
- Lay horizontally and are adjacent to the skin panel
- Attached to the frames and help to carry the pressure loads across the fuselage
- Support cabin pressurization and absorb normal loads of the seat tracks and floor panels
- Floor-to-skin shear ties:
- Extend along the 2 sides of the fuselage and are level with the floor beams
- Carry loads along with the keel beam and the skin/stringer panels of the lower half of the forward and aft fuselage
Fuselage Center Section
- Provides part of the cabin with a structure for joining the center wing box and main landing gears together
- The area underneath the cabin floor of the aircraft is unpressurized
- A pressure boundary is made by the upper skin panel of the center wing box and a pressure diaphragm extends from the wing box above the main landing gears
- The forward and aft pressure boundary is created by the pressure bulkheads which lie in front of the center wing box and at the end of the main landing gear bay
Explore the installation and purpose of pressure bulkheads in aircraft structural repair. Learn about the various areas where pressure bulkheads are located and their significance in withstanding cabin pressure.
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