15.14 engine indication systems Flashcards
(26 cards)
what are the three engine indication groups
performance indications
system indications
engine trend monitoring
whats performance indications also known as
primary indications
what is system indications known as
secondary indications
where is engine performance indications located on ecam
always at the top
what indications are used to show thrust
rotational speed of fan, n1
engine pressure ratio
what are examples of secondary indications
oil quantitiy
oil pressure
engine vibration
what are the three engine analyses done
thermodynamic analysis
mechanic-dynamic analysis
oil consumption analysis
what does the thermodynamic analysis check
checks the pressure and temperatures along the gas flow path
what does the mechanic-dynamic analysis mainly check
mainly checks for failures in rotor system
what does the epr compare
compares engine turbine discharged pressure to the pressure of the ram air at the inlet
where are the measurements taken from for epr
probes installed in the engine inlet and turbine exhaustq
what is flexibletakeoff
standard takeoff thrust setting used on aircraft unless wet runway or have to do TOGA
how does bourdon tube work to measure oil pressure
when pressure enters the tube it causes the tube to move and open the c shape - the deflection is measured on a scale
how does strain gauge type work
electronic pressure sensor measures the physical reaction to an applied pressure then measuring the proportional change electronically
what is the most common type of oil temp sensor used in aircraft engine
resistance temp detector (RTD)
where are low pressure fuel sensor located
positioned after outlet from low pressure filter
how is fuel temp measured
resistance type electric fuel temp sender in main tank
what does fuel flow indicating system show
actual fuel flow to engines
fuel used since the engine was started
how are engine rotor speed indications expressed
as a percentage of a 100% design speed
what are the 3 main parts of rotor speed indications
sensor
data transmission
indication
what are the two types of sensor that can measure rotor speed
variable reluctance
tachometer generator type
how does variable reluctance sensor work
permanent magnet and magnetic target (teeth on a gear wheel) positioned close to each other. as the wheel rotates, it creates a pulse and a reading
how does tachometer generator work
permanent magnet driven by gearbox with a speed proportional to n2
what units is engine vibration represented in
0-6
