In what publication can a mechanic find the operating
limitations for an aircraft engine? - ANSWER- In the TCDS for
the engine
Who is authorized to perform the powerplant inspection that is
required for an annual inspection? - ANSWER- An A&P
mechanic who holds an IA
What are two types of compression checks that can be
performed on an aircraft reciprocating engine? - ANSWER- A
differential compression check and a direct compression check
What items are checked in a hot section inspection of a turbine
engine? - ANSWER- The combustion sections is checked for
cracks or distortion. The turbine wheel, the turbine case, and the
,2|Page
exhaust section are checked for cracks, indications of
overheating, and any indication of warpage, erosion, or burning
What is the most common type of damage that is found in the
hot section of a turbine engine? - ANSWER- Cracks that are
caused by the high concentration of heat in the hot section
Is the use of a checklist required when performing an annual or
100-hour inspection on an aircraft engine? - ANSWER- Yes
What inspection must be performed on an aircraft reciprocating
engine if it has been operated on turbine fuel? - ANSWER- The
inside of the cylinders must be inspected with borescope. The oil
must be changed and the filters examined, and the engine given
a careful run-up and operational check
In what units is the tachometer for a reciprocating engine
calibrated? - ANSWER- In hundreds of RPM
In what units is the tachometer for a turbine engine calibrated? -
ANSWER- In percent of the engine's rated takeoff RPM
,3|Page
Where does the manifold pressure gage used on an aircraft
reciprocating engine pick up the pressure it measures? -
ANSWER- From the intake manifold of the engine
What are two types of pickups used for measuring the cylinder
head temperature of a reciprocating engine? - ANSWER- The
thermocoulple can be embedded in a gasket that is installed
under the spark plug of the hottest running cylinder, or it can be
in a bayonet that is held against the cylinder head by a spring
Why do most engine oil pressure gages have a restrictor in the
line between the engine and the instrument? - ANSWER- The
restrictor damps out pressure pulsations in the oil to keep the
needle from oscillating
What is used to measure the fuel flow of a horizontally opposed,
fuel-injected reciprocating engine? - ANSWER- A pressure
gage that measures the pressure drop across injector nozzles
What is indicated if the needle of a ratiometer-type oil
temperature indicator pegs to the high side of the dial as soon as
the aircraft master switch is turned on? - ANSWER- There is an
open in the bulb circuit that causes the instrument to see an
infinite resistance. The higher the resistance in the bulb circuit,
the higher the temperature indication
, 4|Page
What type of indicating system is used to measure the EGT of a
turbine engine? - ANSWER- A set of thermocouples arranged in
an averaging circuit. These thermocouples are installed in the
tail pipe of the engine
What should a thermocouple-type cylinder head temperature
indicator read when the engine is not operating? - ANSWER-
The temp of the outside air
how does a torquemeter actually measure the torque produced
by an engine? - ANSWER- A torquemeter is actually an oil
pressure gage. The pressure it measures is produced in a torque
sensor and is proportional to the amount of strain in the torsional
shaft that drives the reduction gears of the turboprop engine
What two pressures are measured to get the Engine pressure
Ratio of a turbojet engine? - ANSWER- The turbine discharge
total pressure and the compressor inlet total pressure
Of what two materials are the thermocouples made that are used
in a turbine engine EGT system? - ANSWER- Chromel and
alumel
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