Airframe 4 Flashcards
Why would it be necessary to analyze an electric electrical system before increasing the load on the system?
To verify the generator capacity, wire size and protective device capacity will not be exceeded
Name several types of electrically operated devices that would be considered intermittent loads on an electrical system
Landing gear motors
Cowl and wing flap motors
Radio transmitters
At what point in a circuit should the protective device be located?
As close to the source as possible
Prior to conducting a continuity check what must be done to an electrical circuit?
The power must be turned off
What is the reason for a master caution, warning system in aircraft?
It draws the cruise attention to a critical situation that will also generally be illuminated on the annunciator panel to identify the problem
What is the purpose of a MACH warning system in aircraft?
It provides an aural warning that aircraft speed limits have been exceeded
How does a takeoff aural warning differ from a landing gear aural warning?
A takeoff warning will be a series of intermittent horns while landing gear. Warning will be a single steady horn
Name at least two items that may cause a takeoff warning horn to operate in a typical transport jet aircraft
Speed brakes, not in takeoff position
Flaps not in their takeoff position
Stabilizer not in takeoff position
Auxiliary power exhaust door, not in takeoff position
When is the time to check, landing gear switches, lights, and warning, horns or buzzers for proper operation?
During a landing gear retraction check
What other aircraft system may activate the lightning gear warning systems?
The wing flap system
What is used to indicate battery over- temperature?
A warning light
What methods are used to supply heat for thermal anti-icing systems?
Turbine compressor hot bleed air
Engine exhaust heat exchangers
Ram air heated by a combustion heater
How is the temperature maintained in a thermal anti-icing system?
By mixing heated air with ambient air
What happens to the anti-icing airflow after it has heated a leading edge surface?
It is exhausted to the atmosphere
How can an electrically heated pitot tube with an ammeter installed in the system be checked for operation?
By noting the current consumption when the heater is turned on
What are two methods of inflating pneumatic deicer boots?
Engine driven vacuum pump
Compressor bleed air from a turbine engine
What normally keeps deicer boots held down in flight?
Suction supplied to the boots
What is the function of the oil separator used in some deicer boot systems?
Remove oil before it reaches the boots and damages the rubber
How are deicer boots attached to the leading air edge of wings and tail surfaces?
Bonding
Fairing strips and screws
A combination of both
What must be accomplished to a deicer boot prior to a cold patch repair?
Relieve the installed tension
What is the purpose of the electronic timer in a pneumatic deicer boot system?
It controls the operating sequence and time intervals
Why is it necessary to provide overheat protection for anti-icing systems that use turbine engine bleed air?
The air is too hot and can damage the aircraft structure
Describe several potential problems associated with electrically heated windshields
Arcing
Delamination
Scratches
Discoloration
What are the effects of arcing on an electrically heated windshield?
Localized overheating, and damage to the windshield
How are fenwal sensing elements wired?
In series to a control unit
Describe a continuous loop detection system
One or more wires embedded in a special ceramic core that change resistance with a change in temperature
How many a photoelectric smoke detector be checked?
By operating a switch in the test circuit
What are two types of installed fire extinguishing systems?
CO2
Halogenated hydrocarbons (HALON)
What protection is provided for a fire extinguisher bottle in case of a temperature rise in excess of settle limits?
The agent dumps overboard ejecting a red thermal discharge indicator disk
What type extinguishing agent is usually found in a high rate of discharge system?
Halogenated hydrocarbon (HALON)
What procedure is used to check a fire extinguisher container for pressure?
A chart is used to determine a minimum and maximum gauge reading based on temperature
What is the purpose of the yellow disk and a fire extinguisher system?
It indicates a normal system discharge
How is the service life of a discharge cartridge calculated?
By the manufacturers date stamp on the face of the cartridge
Describe the mechanism by which a Freon bottle is discharged
An electrical signal fire is an explosive squib, which ruptures a frangible disk
Name the two basic types of fire extinguishing systems
Conventional system
High rate discharge system
