AGK Aircraft Systems & Structures Flashcards
What are to components of a monocoque construction?
Bulkhead
Former and frames
Skin
What are to components of a semi-monocoque construction?
Stringer
Frame
Floor beam
Longeron
Firewall
Aircraft Skin
Why are fuselages circular?
Ensures good airflow
Circular cross sections can easily withstand pressurization loads.
What are the characteristics of centre wing box
- Forms part of the centre wing box
- provides attachment points of the wings
- Holds fuel
What are the characteristics of torsion wing box (wing structure)
Main structural component in a wing that is made up of spars, ribs, upper and lower skins.
What does eye reference position do?
Ensure that pilot sits at the right design eye point.
Why are flight windows layered?
For strength and heated with enough flexibility to withstand bird strike.
What is meant by the term safe life?
Minimum life given to the aircraft during which it will not suffer catastrophic failure based on; flying hours, cycle, landings and take-offs and pressurizations.
What’s the difference between hard time and on condition maintenance?
Hard-time - item must be removed from service before its scheduled maintenance for inspection or repair.
On condition - an inspection-functional check that determines an items performance and may result in removal if it fails in service
What is an accumulator?
Its is filled with non-flammable gas nitrogen to:
-Store hydraulic fluid under pressure.
-Provide a limited supply of pressurized fluid in an emergency
-Dampen pressure fluctuations in the system
-Allow for thermal expansion
-Allow for small internal leaks
What are hydraulic pumps and what are the different pumps?
It is to provide a flow of fluid to produce the pressure of the system.
Spur and rotary pumps (light aircraft)
Piston pumps in (larger aircraft)
Electrical pumps (emergency backup)
Hand pumps (Maintenance purposes)
A shuttle valve…
Allows two hydraulic supplies to operate one hydraulic service
What are the threats of hydraulic systems
System overheat: exceeds its maximum allowable operating temperature and must be re-energized
Low system pressure: loss of fluid, blockage or failure of a hydraulic pumps
Hydraulic fuel contamination: Can be chemical or particulate by improper servicing of system or component failure
