(Under Construction) Flashcards
Turbojet and turbofan thrust reverser systems are generally powered by…
Hydraulic or pneumatic
What is required regarding aircraft fire protection systems?
-Illuminates a light on the flight deck which indicates location of fire
-Audible alarm
-Low number or no false alarms
-Resettable when fire is out
-Minimum electrical current requirements
-ALL the above
ALL the above
Which statement is true?
1. Some exhaust systems include an augmentor system to draw additional air over the engine for cooling.
2. Augmentor systems are used to create a low pressure area at the lower rear of the aircraft engine cowling.
Both are true
What does a booster coil on a radial engine operate off of?
Battery power and a trailing finger in the distributor
What is a common visual check of fire detection elements?
Cracked or broken sections
How does a fire detection system operate?
On the principle of building of a gas pressure within a tube proportional to a temp rise
Example: Lindberg pneumatic thermal system
What publication would be used to obtain crankshaft runout tolerances after a ground incident resulting in propeller sudden stoppage?
Current manufacturers maintenance manuals
What does a hissing sound from the carburetor indicate when the propeller is pulled through manually?
Intake valve blow-by
What is a manifold pressure gauge designed to indicate?
Absolute pressure in the intake manifold
What is a common method used to prevent carburetor icing?
Preheat the intake air
What must a QECA (quick-engine-change-assembly) be pre-approved by?
The administrator or an airframe and powerplant mechanic with inspection authorization
After control signals are sent from the Electronic Engine Control (EEC) to regulate fuel flow to the engine, what happens next?
Feedback from several systems in the engine is sent back to the EEC
How is aircraft electrical wire size measured?
According to American wire gauge (AWG)
Which of the following are NOT recommended markers for reciprocating engine exhaust systems?
Lead pencil
What does a movement of the propeller in the direction of engine rotation during a reciprocating engine compression check indicate?
The piston was positioned past top dead center
Compared to reciprocating engine oils, what do turbine engine oils have less tendency to produce?
Lacquer or coke
What increases pitch angle in constant speed non-feathering propellers like McCauley and Hartzell?
Oil pressure
How are cylinder head temperatures measured in a gas turbine engine?
By means of an indicator and a thermocouple sensing device
Where are fire protection systems mandatory?
On auxiliary power unit
For what primary purpose is a turbine engine fuel control unit trimmed?
To obtain maximum thrust output when desired
What percentage of the indicated horsepower on a modern aircraft engine may friction horsepower be?
10-15%
What is considered ground boosted engine manifold pressure?
Any manifold pressure above 30 inches Hg
What can cause hot spots that burn a hole in the combustion section liner on a turbine engine?
A misaligned fuel nozzle resulting in a flame that is not centered in the flame area
How are combustion liner walls cooled in a gas turbine engine?
By secondary airflow through the combustion chamber
How can a steel propeller hub be tested for cracks?
By magnetic particle inspection
How does high-tension ignition shielding tend to reduce radio interference?
Receives and grounds high frequency waves coming from the magneto and high tension ignition leads
How is a fire extinguishing agent distributed in the engine section?
By spray nozzles and perforated tubing
How may reciprocating engine exhaust system leaks be detected?
By signs of exhaust soot inside the cowling and on adjacent components
What happens when ice forms on propellers during flight?
Decreases thrust and causes excessive vibration
When should the combustion process be completed if fuel/air ratio is proper and ignition timing is correct?
20 to 30 degrees after top dead center at the beginning of the power stroke
What happens in a supervisory electronic engine control EEC if there is a fault that adversely affects engine operations?
Causes an immediate reversion to control by the hydromechanical fuel control unit
How can the condition of an engine be discerned in addition to changing oil regularly?
By the amount of metal chips found on the magnetic chip detector
What functions does engine oil perform in addition to lubrication?
Cools
Seals
Cleans
Prevents corrosion
Cushions impact loads
All the above
All functions are performed by engine oil
What are the two most common materials for conductors in aircraft applications?
Copper and aluminum
How should AN and MS electrical connectors be installed to reduce ground shorting possibility when separated for maintenance?
With the pin section on the ground side of the electrical circuit
Which statement is NOT true regarding using a turbine engine oil analysis program?
Generally
Prevents corrosion
All the above
This answer refers to the properties listed in the text
Cushions impact loads
All the above
This answer refers to the properties listed in the text
Two most common materials for conductors in aircraft applications
Copper and aluminum
Installation of AN and MS electrical connectors
Pin section on the ground side of the electrical circuit
Turbine engine oil analysis program
Generally, an accurate trend forecast may be made after an engine’s first oil sample analysis
Example sentence: Regular oil analysis helps in monitoring engine health.
Units turbine engine tachometers are calibrated in
Percent of engine RPM
Recommended maximum number of wires in wire bundles
75 wires
Timing of magneto breaker points
Greatest magnetic field stress exists in the magneto circuit
Main bearing oil seals used in turbine engines
Labyrinth and/or carbon rubber
Master rod bearings type
Plain
Newton’s Third Law of Motion
For every action there is an equal and opposite reaction
Factors in the selection of wire size in a particular application
Voltage drop, Allowable power loss, Current carrying capability
Factors 1, 4, and 5 from the text
Variables for which trim valves are adjusted on a typical engine trim check chart
Ambient temperature and barometric pressure
Oil source for propeller governor on a Pratt and Whitney PT-6 turboprop engine
The engine oil supply
Part of cylinder walls where greatest amount of wear occurs in a normally operating engine
Near the top of the cylinder
Commonly used source for carburetor air heat
Warm ducted air from around the exhaust system
Clutch type in pneumatic starters
Manually engaged and automatically disengaged
Unacceptable issue in reciprocating engine exhaust systems
Local hot spots
Reason for using capacitor-type ignition system on turbine engines
High heat intensity spark
Calculation of compression ratio of an engine
The volume of the cylinder at BDC divided by the volume of the cylinder at TDC
Purpose of the crankcase of an aircraft engine
Is the foundation of the engine containing crankshaft bearings and cylinder pads
Description of crankpin
Hardened by nitriding and is hollow to reduce weight
Attachment method of cylinders to crankcase in aircraft engine
By studs mounted in threaded holes in the crankcase
Energy source for turning the propeller on a turboprop engine
Additional turbine stages
Indication of engine thrust from the engine pressure ratio indicator
Engine thrust being produced
Design purpose of the exhaust section of a turbine engine
Impart a high exit velocity to the exhaust gasses
Function of floating control thermostat in reciprocating engine installations
Controlling airflow through the oil cooler
Purpose of exhaust cone assembly of a turbine engine
Straighten and collect the exhaust gasses into a solid exhaust jet
General requirements for an aircraft engine
Have a good fuel economy, high durability, and be capable of sustained high power output
Additional requirements mentioned in the text
Portion of heat generated by combustion in a typical aircraft reciprocating engine
Carried out with the exhaust gasses
Heat engine predominantly used in aviation
Opposed-type engine
Primary purpose of baffles and deflectors installed around cylinders of air-cooled aircraft engines
Force cooling air into close contact with all parts of the cylinder
Primary purpose of the propeller
Change engine horsepower to thrust
Purpose of a bellmouth inlet
Maximize the aerodynamic efficiency of the inlet
Purpose of cascade vanes in a thrust reversing system
Turn the exhaust gasses forward just after exiting the exhaust nozzle
Purpose of the engine inlet on a turbine engine
Provide a uniform and steady airflow to avoid compressor stall
Receiving inspection for an engine needing to be overhauled
Includes checking the airworthiness directives, service bulletins and type certificate compliance
Consideration for the resistance of the current return path through the aircraft
Structure is adequately bonded
Type of ignition system used on most turbine aircraft engines
Capacitor discharge
The purpose of the engine inlet on a turbine engine is to
Provide a uniform and steady airflow to avoid compressor stall
Example sentence: The engine inlet ensures the compressor receives consistent airflow.
The receiving inspection for an engine needing to be overhauled
Includes checking the airworthiness directives, service bulletins and type certificate compliance
No additional information
The resistance of the current return path through the aircraft is always considered negligible, provided the
Structure is adequately bonded
No additional information
The type of ignition system used on most turbine aircraft engines is
Capacitor discharge
No additional information
The wire identification code of aircraft wire is
The choice of the manufacturer
No additional information
Thermal efficiency of an engine
Affects the fuel consumption of an engine
No additional information
Thermocouples are usually inserted or installed on the
Hottest cylinder of the engine
No additional information
Turbine engines produce noise primarily from engine air intake, vibration, and engine exhaust. Which of these is of the greatest concern?
Engine exhaust noise from the high velocity jet stream moving through a relatively quiet atmosphere
No additional information
Turbine inlet nozzle assembly located on the upstream side of each turbine wheel are used in the gas turbine engine to
Increase the velocity of the gasses flowing past this point
No additional information
Valve clearance changes on opposed-type engines using hydraulic lifters are accomplished by
Replacing the push rod
No additional information
What component of a dual magneto is shared by both ignition systems?
Rotating magnet
No additional information
What is the function of a blast tube as used on aircraft reciprocating engines?
A device to cool an engine accessory
No additional information
What is the primary purpose of the tachometer on an axial compressor turbine engine?
Monitor engine RPM during starting and to indicate overspeed conditions
No additional information
What type of fireproof connector is used in areas where it is vital that the electric current is not interrupted, even though the connector may be exposed to continuous open flame?
Class K connector
No additional information
What type of nuts are used to hold an exhaust system to the cylinders?
Brass or heat-resistant high temperature locking nuts
No additional information
What type of oil do most engine manufacturer’s recommend after new reciprocating engine break-in?
Straight mineral oil
No additional information
When a reciprocating aircraft engine is started, what is the maximum time period to wait for an indication of oil pressure?
30 seconds
No additional information
When internally timing a magneto, the breaker points begin to open when
The magnet poles are a few degrees beyond the neutral position
No additional information
When mounting a replacement engine always,
Install the manufacturer specified bolts and torque to the manufacturer recommended value
No additional information
When preparing to remove an engine, fuel valves must be
Fully closed even if they are solenoid operated
No additional information
When the centrifugal force acting on the propeller governor flyweights overcomes the tension on the speeder spring, a propeller is in what speed condition?
Overspeed
No additional information
When trimming a turbine engine, the fuel control is adjusted to
Set idle RPIM and maximum RPM, indirectly affecting EPR
No additional information
Where are sludge chambers, when used in aircraft lubrication systems, usually located?
In the crankshaft throws
No additional information
Where is the oil temperature bulb usually located?
At the engine oil inlet
No additional information
Which of the following generally renders an aluminum alloy propeller un-repairable?
Transverse cracks of any size
No additional information
Which of the following is a function of the fuel/oil heat exchanger on a turbojet engine?
Increase fuel temperature
No additional information
Which of the following is identified as the cambered or curved side of the propeller blade corresponding to the upper surface of a wing airfoil section? airfoil section?
Blade back
No additional information
Which of the following is the safest fire-extinguishing agent?
Halon 1301
No additional information
Which statement is correct regarding the ignition system of a turbine engine?
The system is normally de-energized as soon as the engine starts
No additional information
Which statement is true concerning the inlet icing of turbine engines?
Most turboprop engines rely on electrical anti-icing
No additional information
Which statement is true regarding proper throttle rigging of an airplane?
The throttle stop on the carburetor must be contacted before the stop in the cockpit
No additional information
Which type of fuel control is used on most of today’s turbine engines?
Hydromechanical or electrical
No additional information
Why are turbine engine igniters less susceptible to fouling than reciprocating engine spark plugs?
The high intensity spark cleans the igniter
No additional information
