Airframe 5 Flashcards
What is the purpose of a rotorcraft cyclic pitch control?
To change the pitch of the main rotor blades during its cycle of rotation
What are the three types of hydraulic fluids?
Synthetic ether base
Polyalphaoelefins ( Polly- al-Fay-la-fins)
Phosphate esters
What methods are used to drive turn and bank/slip indicators?
Vacuum, air pressure or electricity
What is the meaning of swinging a compass?
Correcting for deviations by adjusting the compensating magnets
Name at least two items that should be looked for during an inspection of a magnetic compass:
Security of attachment
Correct readings at various headings
The bowl should be full and without bubbles or discoloration
The scale should be readable
Moving parts should easily work
In what way do magnetic fields generated by electrical equipment and steel parts in the airplane affect a magnetic compass?
They deflect the compass from correct alignment with the earths magnetic field
What quantity is accurately measured by a capacitance type fuel quantity indicating system?
The mass of the fuel
Name several types of electrically operated devices that would be considered intermittent loads of an electrical system:
Landing gear motors
Cowl and wing flap motors
Radio transmitters
Under what conditions must a switch be derated from its nominal rating?
When used with inductive circuits, circuits with high in-rush current, and with DC motors
At what point in a circuit should the protective device be located?
As close to the source as possible
What could cause an AC electric motor to run too slowly?
Lack of lubrication, defective wiring, or low voltage
Prior to conducting a continuity check, what must be done to an electrical circuit?
The power must be turned off
What warning system may be required when a nickel-cadmium battery is installed in an aircraft?
A battery temperature monitoring system
How may a photoelectric smoke detector be checked?
By operating a switch in the test circuit
Name 2 types of smoke detection instruments used in aircraft:
Light refraction
Ionization
What are 2 types of installed fire extinguishing systems?
CO2
Halogenated hydrocarbons (HALON)
What indications may be caused by kinks and sharp bends in the sensing elements of a fire detection system?
False fire warnings caused by a short
What does a thermal switch fire detection system consist of?
Heat-sensitive units that complete electrical circuit at certain temperatures, which triggers a warning
How are thermal switch units wired?
Parallel with each other and in series with the light
How is a thermocouple fire warning system different from a thermal switch system?
Thermal switch works once a specific temperature is reached
Thermocouple works based on the rate of temperature rise
How are Fenwal sensing elements wired?
In series to a control unit
How are the detector units in a double-loop fenwal system wired?
In parallel between 2 complete loops of wiring
Describe a continuous loop detection system:
One or more wires embedded in a special ceramic core that change resistance with a change in temperature
What is a swash plate?
Transmit control inputs from the collective and cyclic controls to the main rotor blades.
What does throttle control do in a helicopter?
Regulates engine rpm
What does the governor do in a helicopter?
Sensing device that senses rotor and engine rpm and makes the necessary adjustments in order to keep rotor rpm constant.
What does the cyclic pitch control do in a helicopter?
Tilt the tip-path plane in the desired horizontal direction.
What is the most common type of rivet used in aircraft construction?
Solid shank rivets
What are thermosetting and thermoplastics used for ?
Thermoplastic - widows and windshields
Thermosetting- matrix material
Name some of the factors that a cause crazing in transparent plastic windows and windshields?
Exposure to ultraviolet light. stress. solvents. and improper handling.
What type of defect in. or damage to. a bonded honeycomb structure can be repaired using the potted repair method?
Filing a hole
What are the most common causes for delimitation of a composite structure?
Sonic vibration. expansion of internal moisture. liquid leakage. and a manufacturing error.
A drill bit used for drilling composites should have an included angle of how many degrees?
135
What must be done with a damaged area in a bonded honeycomb structure prior to beginning repairs?
The damaged area must be completely removed.
