Powerplant Flashcards
What engines are on the Phenom 300? How many lbs of thrust?
Pratt & Whitney PW535E; 3360 lbs of thrust.
How are the engines controlled?
By a dual channel Full Authority Digital Electronic Control, (FADEC) system. Each
engine is controlled and monitored by two FADEC channels. When one channel is in
control, the other is in standby mode.
What supplies power to the FADEC?
A 28VDC airframe power is required to enable operation of the control system and
to start the engine. Once the engine is running, the FADEC takes its primary power
from either the engine driven PMA or the 28VDC airframe power, whichever
provides more power. The 28VDC airframe power bus is available for
back-up supply purposes
What are some of the functions of the FADEC?
- During START, it accelerates the operating engine’s N2 to 72% to protect the
gear box from damage. - Ensures no limits are exceeded on hot, hung or no start.
- Controls Automatic Thrust, (ATR).
- Provides WHSAIS envelope information to the AMS controller.
- Schedules fuel flow during starting based on N2 speed and ambient conditions.
- Controls the igniters.
- Calculates an N1 speed setting corresponding to the Thrust Lever Angle, (TLA)
position selected, and compensates this setting for ambient temperatures and
pressures, aircraft bleed off-takeoffs and operating modes. The FADEC then
governs the engine to this N1 value.
During start, when are both igniters automatically energized?
The FADEC energizes one igniter for ground engine starting when
TT0 is above 0°C and both igniters when TT0 is below 0°C or for in-flight
engine starting.
How does the FADEC assist an In-Flight Start?
FADEC automatically actuates both igniters during starting and
disables the abort starting logic. In this case, the decision on whether
to abort an unsuccessful start is at the pilot’s discretion.
How does the FADEC assist for an Auto Relight?
The FADEC continuously monitors the engine parameters and
automatically turns on both igniters and schedules the relight fuel flow
in case an engine flameout is detected, assuming the ENG START/STOP
knob is out of the STOP position.
How is dry motoring performed?
By setting the ENG IGNITION switch to OFF, while the engine is in
shutdown state, and by setting the ENG START/STOP knob to START.
- What is the purpose of the Permanent Magnetic Alternator, (PMA)?
The PMA is the primary source of AC power to both channels
of the FADEC when the engine is running above idle. Below this speed,
the primary source of AC power to the FADEC is the airframe 28VDC
power, which is used during engine starting and as a backup source for
the PMA.
What is the purpose of the ATR?
The ATR, controlled by the FADEC, automatically provides maximum
engine thrust (TO RSV or GA RSV) whenever it is armed, thrust levers
are at least at the TO/GA position, and one of following conditions
occurs:
Difference of N1 values is greater than 20% between both
engines (one engine fails);
Loss of communication between both engines.
2
3
The TO RSV thrust is also provided whenever both engines are
operating and both thrust levers are positioned to MAX, if the ATR is
armed.
The ATR status (ON/OFF) may be selected via MFD bezel on the
Takeoff Data Set Menu. However, if no selection is made before takeoff,
the system assumes status ON.
Whenever the ATR is activated, the green ATR indication on the MFD
disappears and the cyan thrust mode will be displayed with an
additional “RSV” indication.
When ATR is commanded, the FADEC will send a discrete hardwired
command to close the ECS flow control valve. This will have the effect
that no bleed to the airplane air conditioning system will be extracted
from the engine. The ECS OFF will also be commanded if one bleed
fails during takeoff or go-around with wing and horizontal stabilizer
anti-ice ON
- What will happen if the START/STOP knob is moved to STOP and the TLA is not
at idle?
The FADEC will disregard the STOP selection and not shut down the engine
- Under normal operating conditions what color are the engine instruments
pointers and digits?
Green
What does an “E1/2 OIL IMP BYP” CAS message indicate?
There is an impending blockage of an oil filter
