Airframe Flashcards
(25 cards)
What is a joggle?
The offset formed on a part to allow clerance for a sheet or another mating part.
Describe the criteria for replacement of a 2117 rivet for general repair, requirements
For 5/32 or less diameter, USE THE NEXT larger size rivet 2117 and the edge/spacing distance meet the minimum requirements
What action is taken to prevent cracks from forming while dimpling magnesium or some hard sheet metals?
Hot dimpling equipment is used to preheat and soften the metal before the dimpling is formed.
How does a gear-type power pump operate?
Two meshed gears are driven by a power unit rotate in a housing. FLUID is carried around the outside of the gears and delivered to the outlet side as the gears rotate.
What is the purpose of a pressure relief valve?
It LIMITS PRESSURE, preventing failure of the system components.
What is the purpose of a pressure regulator?
It MANAGES the OUTPUT of the pump to MAINTAIN system PRESSURE and allow the pump to turn without resistance (unloading)
What types of components or systems are pneumatically operated in some aircraft?
Landing Gear, Brakes, Flaps & other mechanic actuators
Name serveral sources of pneumatic power?
Storage bottles, engine bleed air, engine-driven compressor or vane-type pumps
How does a continuous-flow oxygen system operate?
Oxygen flows from a charged cylinder through a high-pressure line to a reducing valve and to mask outlets.
How does a basic pressure-demand oxygen system operate?
Oxygen flows from a charged cylinder to a pressure-demand regulator, that’s adjustable by each crewmember
What components are used in an air-cycle cooling system?
Expansion turbine
Heat exchanger
Various valves
Describe the basic operating principles that allow an air-cycle system to produce air.
1) Engine air bleed is cooled in the primary heat exchanger
2) Compressed cooled again in the second heat exchange
3) Enters a turbine that removes the energy and pressure of the air dropping the air temperature
What causes a temperature drop in an air-cycle cooling system?
The compressed air performs the work of turning a turbine, and it undergoes a pressure and temperature drop.
How does a water separator remove moisture from the air?
The moist air passes through vanes that swirl the air and the droplets are collected and drained
What is a vapor-cycle cooling?
A closed system in which refrigerant Freon is circulated through tubing & variety of components to remove heat from the aircraft
What components are in a vapor-cycle cooling?
Receiver Dryer
Evaporator
Compressor
Condenser
Expansion valve
What is the function of ventilating air in a combustion heater?
It transport heat from the heater into the cabin
AND
Prevents combustion gasses from entering the cabin if the combustion chamber develops a CRACK
How is the output voltage of an alternator controlled?
By changing the field CURRENT that exited the alternator
Under what conditions must a switch be derated from its nominal rating?
When used with:
1) Inductive circuits
2) Circuits with high in-rush current
And
3) DC motors
(When switching motors, coils, or anything with a current spike—especially in DC.)
What are the components of a typical VOR system?
Receiver
Visual indicator
Frequency selector
Antennas
Power supply
Memory hook:
“Real VORs Find A Path”
(Receiver, Visual indicator, Frequency selector, Antennas, Power supply)
What are the basic components of a radio communication system?
A mic
Transmitter
Antennas
Receiver
Speaker or headphones
What factors are considered when selecting wire size for electrical power?
Permissible voltage drop
System voltage
Wire length
Current carrying
If load is intermittent or continuous
What factors are used to determine setback?
Bend Radius
Material Thickness
What calculation must be made when bending sheet metal?
Setback
Bend Allowance
