Engine SYS - 2 Flashcards
The EDECU will display a torque signal of?
25%
what is the connection between NP and NR?
1way mechanical connection via the freewheeling unit
what function of DEC keeps NP at 100%?
NP governing
how do you manually turn off starter?
pull down on PCL
3 modules of engine
cold, hot, power turbine, accessory
How does the cockpit receive the NG signal?
from the NG winding of the alternator
how does DEC get power?
primarily through alternator
secondary through AC airframe power
Where does the engine receive its electrical power?
Engine Alternator
describe load demand system
provides mechanical input directly from the collective
output flight control mixer to the engine HMU to reduce transient engine and NR droop.
Alternator windings (3)?
NG speed, DEC power, ignition power
cabin heat is provided how?
sce/ht switch to engine
When does the DEC go into 2.5min limiting?
when torque of one engine is 50% below the other
3 main functions of DEC
NP governing, torque match, single fault validation, hot start prevention,
The pneumatic start system (EPU) uses air turbine engine start motor for?
engine starting
oil holds ___
Has to be __________ for flights more than 6 hrs
______ for flights less than 6 hrs.
7quarts
at the full line
above the fill line
How does eng. oiling occur?
liquid to liquid cooler, oil from the scroll vanes
When will fuel flow be automatically be shut off to the engine during the start sequence (hot start prevention)
when TGT reaches 900c,
what controls air/fuel mix?
hmu through fuel scheduling
Oil from the chip detector passes through the oil cooler and is cooled by?
transferring heat from the oil to fuel
if NG signal is lost, what happens?
engine out warning light and audio 0% NG
where is the oil drawn from in an emergency
sumps a and b
Overservicing is not possible because oil will?
flow out the filler port
What are are the 2 operational sections of the engine?
NG and NP
primary functions of ODV
Hot start prev
Fuel purge
fuel sequencing/12 injectors
Overspeed shuts off (120%)
