30 Questions
What is recommended to prevent connectors from unscrewing during flight?
Using a positive locking device
Why are battery connections lubricated with white petroleum jelly?
To prevent corrosion
What is recommended for securing all types of battery securing mechanisms?
Lockwiring them
What is the purpose of lockwiring connectors and batteries?
Enhancing security
Why is it important to refer to the aircraft maintenance manual before installing a battery?
To ensure the correct battery type is used
What should be done if a connector does not have an inbuilt locking device?
Lockwire it closed with 26 AWG copper wire
What is the function of the charge relief valve in the hydraulic circuit?
Regulates the operating pressure of the charge oil system
Where does the oil cooler obtain the air for cooling the CSD oil?
Engine fan air
What happens if the pressure differential across the oil cooler reaches a pre-determined value?
Pressure-operated bypass valve opens
Where is the scavenge filter located in the hydraulic system?
In the scavenge line between the scavenge pump and the reservoir
What does the Differential Pressure Indicator in the scavenge filter housing warn of?
Impending blockage
What action is required if either of the hydraulic filters becomes blocked?
Replace the IDG
What is the purpose of the sump jar in Battery Ventilation System A?
To prevent damage to the aircraft skin
Which ventilation system may or may not utilize a sump jar according to the text?
System C
How are connections to light aircraft batteries usually designed?
Bolt-on connections
What is the purpose of smearing lugs with an approved lubricant before connecting light aircraft batteries?
To prevent corrosion
In a pressurized aircraft system, where does the air from the pressurization system pass through?
Non-return valve
What feature do larger fully enclosed batteries usually have due to safety concerns?
Quick disconnect socket
What kind of mechanism activates when the circuit breaker is tripped?
Trip mechanism
Which component of the thermal circuit breaker uses a bimetallic strip to operate?
Thermal element
What happens to the thermal element when the current exceeds the circuit breaker's rating?
Distorts
What is primarily responsible for opening the main switch contacts in a thermal circuit breaker during a short circuit?
Thermal element heat buildup
What must be done to reset a circuit breaker after it has tripped due to excessive current?
Manually reset it
Why do circuit breaker panels need clear labelling according to the text?
For easier identification of circuits
What is the purpose of a rectifier circuit?
To convert alternating current into direct current
In a transformer, what is a tap?
A wire connection made at the very ends of a winding
What kind of current do diodes allow to flow in a rectifier circuit?
Direct current
Transformer Rectifier Units (TRUs) are designed to operate on which type of input?
Three-phase AC
What is the typical frequency of the input going into a Transformer Rectifier Unit (TRU)?
400 Hz
If the input voltage to a rectifier circuit is 115/200-V AC, what would be the output after rectification?
~28-V DC
Test your knowledge on pressurised aircraft's internal air usage, battery ventilation systems, and aircraft pressurization and ventilation systems. Learn about the components of different types of aircraft ventilation systems.
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