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G650 Intial > Power Plant > Flashcards

Power Plant Flashcards

1
Q

What section of engine provides
air for Environmental Control
System (ECS), wing anti-icing,
nose cowl anti-icing and engine
internal cooling / sealing?

A

5TH & 8TH stage of the HP compressor
Ref: AOM 2A

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2
Q

The parameter used to measure
forward thrust in primary control
mode is Engine Pressure Ratio
(EPR). How is it derived?

A

By forming ratio of outlet pressure to inlet pressure
Ref: AOM 2A

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3
Q

What happens to engine during
water ingestion?

A

Bleed handling valves are commanded OPEN,
continuous ignition is selected ON automatically, and
engine idle speed is increased to ensure engine stability
and allow water to pass into bypass flow.
Ref: AOM 2A

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4
Q

FADEC is normally powered by
its Permanent Magnetic Alternator
(PMA). What happens during
engine start or failure of PMA?

A

Alternate source of power is provided by aircraft 28V
DC essential power
Ref: AOM 2A

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5
Q

What engines are on the G650

A

Rolls-Royce BR700x725
High bypass (4.4:1) turbo fans
16900lbs of thrust

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6
Q

Primary function of Engine
Vibration Monitoring System
(EVMS) is to monitor the balance
of rotating assemblies in the
engine in order to detect possible
mechanical failure. How many sets
of probes are used?

A

Two (2) sets of probes (one primary and one secondary)
to measure amount of rotation on both LP and HP
rotating components
Ref: AOM 2A

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7
Q

When should an engine be shut
down for abnormal EVM
indications?

A

If vibration is accompanied by other failure indications
Ref: AOM 2A

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8
Q

When might vibrations exceed
alert levels and be considered
normal?

A

Icing conditions
Ref: AOM 2A

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9
Q

At what altitude must the boost
pumps be operating to sustain
engine operation?

A

Above 20,000 feet
Ref: AOM 2A

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10
Q

What’s the primary purpose of
Fuel Cooled Oil Cooler (FCOC)?

A

It enables engine oil to heat fuel and prevent formation
of ice crystals in LP filter and FMU. It also cools the oil.
Ref: AOM 2A

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11
Q

Name four conditions required for
the heated fuel return system to
operate?

A

Not at high power setting, system is armed by selection of
FUEL RETURN switch to AUTO, fuel tank temperature
drops to approximately 0°C, and crossflow closed
Ref: AOM 2A

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12
Q

At what fuel tank temperature does
heated fuel return system cease to
operate?

A

Approximately +10°C
Ref: AOM 2A

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13
Q

What happens during engine
shutdown if capacity of drains tank
(environmental container) is
exceeded?

A

Fuel is dumped overboard
Ref: AOM 2A

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14
Q

What three ways can be used to fill
the oil tank?

A

By conventional gravity filling, through remote
replenishing or pressure filling system for maintenance.
Ref: AOM 2A

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15
Q

When does Fluid Quantity
Indicator (FQI) take a snap shot of
oil quantity and store it as a
historical reading?

A

Five (5) minutes after engine shutdown
Ref: AOM 2A

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16
Q

How does FADEC alternate

channels for consecutive ground starts?

A

It changes channels every time you cycle FUEL
CONTROL switch and changes exciters/igniters every other time unless there’s a start anomaly.
Ref: AOM 2A

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17
Q

True/False: When normal ground
start attempt is aborted due to
anomalies, FADEC automatically
selects the other igniter on the
following normal ground start
attempt.

A

True

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18
Q

True/False: Ignition systems are
capable of being continuously
energized by pilot selection of
continuous ignition.

A

True. There’s no time limitation; however, continued or
very frequent use shortens igniter life.
Ref: AOM 2A

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19
Q

Which type of engine start uses
just one igniter?

A

Normal ground start including crossbleed start and engine
start – battery power only.
Both igniters are used for alternate engine ground start and
all air starts as well as inclement weather mode, auto-
relight, and quick relight.
Ref: AOM 2A

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20
Q

What happens when you select
MASTER START switch to ON?

A

It signals FADEC to arm the automatic start sequence
for start valve and ignition, opens isolation valve and
shuts off the right pack.
Ref: AOM 2A

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21
Q

During engine start, when would
you expect Starter Air Valve
(SVO) and IGN icons to
extinguish?

A

Approximately 44% HP

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22
Q

What’s the only time you’re fully
FADEC protected during an
engine start?

A

During normal start on ground using the MASTER
START switch
Ref: QRH

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23
Q

What’s the caution associated with
opening the starter air valve
manually?

A

Wear high temperature protective gloves and exercise
caution
Ref: QRH

24
Q

What is rotor bow?

A

It’s a phenomenon where LP and HP shafts warp or bow
due to uneven temperatures after shutdown.
Ref: AOM 2A

25
Q

When would you expect FADEC
to perform an automatic rotor bow
avoidance procedure during engine
start?

A

If engine has been shut down for more than twenty (20)
minutes, but less than five (5) hours
Ref: QRH

26
Q

What would be the corrective
action for an Autostart Abort?

A

Select associated FUEL CONTROL switch to OFF and
select ENGINE START MASTER switch to OFF
Ref: QRH

27
Q

Alternate start mode is selected
when MASTER CRANK switch is
placed to ON. In this mode, what
can the FADEC not command?

A

Ignition: the crew must manually select continuous
ignition to ON
Ref: QRH

28
Q

What are the two sources of air for
rotating the engine during airborne
engine start?

A

Air from inside (i.e., from other engine or APU) or air
from outside (i.e., Windmilling).
Ref: QRH

29
Q

Name the three (3) airstart
procedures

A

Normal Airstart – Automatic,
Manual Airstart – Starter-Assist
Manual Airstart – Windmilling
Ref: QRH

30
Q

Which airstart method is
preferred?

A

Normal Airstart – Automatic
Ref: QRH

31
Q

When using Normal Airstart –
Automatic checklist, what does
FADEC use to determine whether
to assist with bleed air or
windmill?

A

Airspeed (i.e., < 250 KCAS, the FADEC opens starter
air valve and > 250 KCAS, starter air valve remains
closed)
Ref: QRH

32
Q

Under what conditions would you
use the Manual Airstart –

Windmilling procedure?

A

If starter was inoperative or in icing conditions
Ref: QRH

33
Q

What’s the auto-relight mode?

A

It’s automatically initiated by FADEC for engine
flameout and rundown. In this mode, FADEC energizes
both igniters continuously and schedules fuel flow until
rpm stabilizes.
Ref: AOM 2A

34
Q

What’s the quick relight mode?

A

Provides a means of automatically relighting the engine
if FUEL CONTROL switch is selected to OFF position
and then reselected to RUN position within 30 seconds.
When activated, fuel is commanded on and both ignition
systems are switched ON.
Ref: AOM 2A

35
Q

How are the engines controlled
and what are the benefits?

A

Engine control is achieved by dual channel Full
Authority Digital Engine Control (FADEC) system for
improved handling, fuel efficiency and longer engine
life.
Ref: AOM 2A

36
Q

Name the three (3) major
components of the FADEC?

A

Electronic engine controller (EEC), data entry plug
(DEP), and permanent magnetic alternator (PMA).
Ref: AOM 2A

37
Q

What are the requirements for
engaging autothrottles on takeoff?

A

Valid EPR rating selected, valid speed target selected,
and > 1.05 EPR
Ref: AOM 2A

38
Q

Why do autothrottles go into hold
mode at 60 kts during takeoff?

A

Autothrottle servos are deenergized to prevent unwanted
thrust reductions during critical takeoff between 60 kts
airspeed, rotation and climbout to 400’ AGL.
Ref: AOM 2A

39
Q

When does autothrottle system
come out of hold?

A

400’ AGL

Ref: AOM 2A

40
Q

What affect does the hold mode
have on rejected takeoff?

A

It allows you to abort with no friction on the throttles
Ref: AOM 2A

41
Q

What happens if you push TO/GA
during a fully coupled two engine
ILS approach?

A

Go-around is commanded (initial 9° pitch up and wings
level), both autopilot and autothrottles remain engaged,
power levers advance to go-around power, and FMS
sequences to missed approach procedure.
Ref: AOM 2A

42
Q

How can autothrottles be
disconnected?

A

Push either quick disconnect switch, toggle either
engage/disengage button, or manually adjust the
throttles.
Ref: AOM 2A

43
Q

How is the engine controlled in
Alternate mode?

A

With LP

Ref: AOM 2A

44
Q

Name the three idle settings.

A

Flight, approach (i.e., high idle), and low or ground idle
Ref: AOM 2A

45
Q

What’s the requirement for
approach idle?

A

Flaps > 20°, aircraft in flight and no wheel spin-up
Ref: AOM 2A

46
Q

FADEC normally governs the
engine power using EPR as
primary control parameter;
however, as an alternative,
FADEC can also use LP fan speed
as engine control parameter.
What’s the changeover between
these two modes of operation
called?

A

A reversion

Ref: AOM 2A

47
Q

What’s the difference between a
soft and hard reversion?

A

A change to alternate control mode, which is initiated by
FADEC, is known as soft reversion. A change initiated
by pilot, through selections made on the SMC (Sensor
page), is known as hard reversion.
Ref: AOM 2A

48
Q

What’s the downside to alternate
control mode?

A

You lose FADEC protection, you lose autothrottles, and
you can’t dispatch in alternate control.
Ref: AOM 2A

49
Q

At a given throttle position (other
than idle), which engine would
provide higher thrust: a hard
reverted engine in alternate LP
control mode or an engine in
normal EPR control mode?

A

Hard reverted engine in alternate LP control mode
would provide higher thrust
Ref: AOM 2A

50
Q

True/False: To prevent sudden
changes in thrust from occurring
when hard reverting the engine
control mode, throttle lever should
always be placed in mid position
before selecting or de-selecting
alternate control on SMC.

A

True

51
Q

How would you describe thrust
reverser operation?

A

Electrically controlled and hydraulically operated
Ref: AOM 2A

52
Q

When would thrust reversers be
available after landing?

A

With wheel spin-up or weight-on-wheels
Ref: AOM 2A

53
Q

Were thrust reversers considered
for landing distance certification?

A

Not on dry runways; they were considered for wet
Ref: AFM Performance section

54
Q

How is the engine controlled in
reverse thrust region?

A

With LP

55
Q

Describe thrust reverser
indications.

A

White REV – unlocked
Green REV – fully deployed (maximum reverse thrust
available)
Amber REV – uncommanded deployment on the
ground: engine limited to idle
Flashing red REV – deployment in flight: engine limited
to idle
Ref: AOM 2A

56
Q

Can an inoperative reverser be
locked out?

A

Yes

G650 Intial (17 decks)

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