Ch 10 Airframes And Related Systems Flashcards
Advantages and disadvantages of tubular construction
Advantages -high strength to weight ratio -field repairable Disadvantages -costly to manufacture -high dimensional tolerances
Types of sheet metal construction
- monocoque
- semi-monocoque
- high strength to weight
- close tolerance
- complex shapes
Types of construction
- tubular
- sheet metal
- bonded
Bonded constantly advantages
- high strength to weight ratio
- reduced construction costs
- wide variety of materials
- save weight (no fasteners/rivets on some of it)
Purpose of vertical stabilizer
Unloads tail rotor in flight (it’s off set)
Helicopter landing gear is not built to withstand ____
High aft loading
Tail section attachments
- tail rotor
- vertical stabilizer (off set)
- horizontal stabilizer
Landing gear
Skids vs wheels
Skids
-lighter & less complex
-additional equipment required for handling
-rugged
Wheels
-ease of ground movement
-can have less parasite drag in flight (retractable)
Locate the datum for a bell 206
-1 inch forward of helicopter
Describe the construction of the AS350 tailboom
- semi-monocoque design
- of riveted construction
What are the two main disadvantages of tubular-truss construction?
- costly for manufacturer
- difficult to hold dimensions to close tolerance
What is the major advantage of tubular-truss construction?
Repairable in field (also has high strength-to-weight ratio)
Which side of the Bell 206 rear fuselage and tail boom are most critical, from an inspection standpoint?
Upper left hand attach point
What material is the canopy of the AS350 made from?
Thermoplastics (Poly Carbonate Polyamide)
What type of airfoil is the lower fin on the AS350?
Symmetrical airfoil
What is used on the skids of the landing gear of the AS350 to reduce the chance of ground resonance?
A long steel strip attached to the skids that is bent downward
Where is the cabin anti-vibration device on the AS350 located?
Under cabin floor beneath pilot and copilot, attached to forward cross beam
Describe the construction of the bathtub on the bell 206 jet ranger
Aluminum honeycomb with aluminum skins
