Engine/APU

Question 1

Recall the rated thrust of the BR715 engine

Answer 1

21,000 lbs

Question 2

Recall the engine starter duty cycle

Answer 2

Lim:
• Three start attempts, with a maximum of 3 minutes duration each
• 15 seconds is required between start attempts
• Allow 15 minutes of starter cooling before further start attempts are made

Question 3

Recall the requirements for a ground, engine AUTO START

Answer 3

• During an auto-start, the EEC controls all fuel metering and ignition to the respective
engine once the ENG START Switch is pulled and the FUEL Switch selected ON.
The auto-start includes an automatic 30 second engine motoring delay before fuel
is introduced
• Auto-Start also includes a TGT protection threshold and will not allow fuel introduction unless the respective TGT is below 150ºC
IGNITION Switch – AUTO
ENG START Switch—Pulled
FUEL Switch – ON

Question 4

Recall reasons for an Auto Abort during a ground engine Auto Start (6)

Answer 4

Auto Starts will automatically terminate and alert the crew
(ENG L/R START ABORT) for:
• Hung Start
• Starter duty timer is exceeded (3 minutes)
• Hot Start (or impending hot start) - 700ºC
• Fuel On condition not satisfied (TGT is above 150ºC)
• Loss of valid N2 input
• Certain failures of both channels of EEC

Question 5

Recall all in flight starts are MANUAL starts

Answer 5

AUTO ABORT start protections provided by the EEC are not available
during in-flight starts – ALL in-flight starts are MANUAL starts

Question 6

Recall the required engine warm up and cool down times

Answer 6

• No minimum warm up time required following an engine shutdown of two hours or less
• A warm up of at least 3 minutes is required following shutdown periods exceeding two
hours
• Engines require a 3 minute cool down prior to shutdown. Verify ENGINE COOL alert message illuminated on EAD

Question 7

Recall approximate STD day, sea level, engine indications after a stabilized start

Answer 7

EPR -- 1.0
N1 – 20%
TGT -- 400
N2 -- 60%
FF -- 600 - 700
Oil Press -- 45

Question 8

Recall the primary FADEC function and its main components (3 main components)

Answer 8

The engines use a Full Authority Digital Engine
Control (FADEC) to control engine functions from start
to shutdown
FADEC has three main components: throttle, throttle
module, and Electronic Engine Control (EEC)

Question 9

Recall when the EEC will provide automatic ignition activation (auto-relight) (4) Recall Engine Anti-ice ignition

Answer 9

The EEC incorporates an automatic re-light function that is armed from engine start to
shutdown
Automatic activation of BOTH ignition systems is activated if the following conditions are
detected and maintained until the conditions no longer exist:
• Combustor instability
• Significant water ingestion
• Significant ice ingestion
• Flameout
NOTE: Additionally, a SINGLE ignition system unit will be automatically energized for 60
seconds after either ENG anti-ice switch has been selected on

Question 10

Recall how to select EMERGENCY thrust

Answer 10

• Emergency thrust is available by pushing the thrust levers through a mechanical gate
• EPR will still be displayed, however, thrust management will be based on N1
• ATS will disconnect automatically and the QRH should be referenced for reengagement
NOTE: Thrust limits achieved at the forward throttle gate should be referred to as
MAXIMUM power. EMERGENCY thrust = through the mechanical gate

Question 11

Recall features and indications of engine reverse thrust

Answer 11

The reversers will only deploy when the respective engine
is running. However, when landing with an engine shut
down, the reverser on the inoperative engine is permitted
to deploy for 30 seconds after nose wheel compression
• When the reversers are out of the stowed position, the amber reverser unlock
indications (U/L) are displayed inside the EPR arcs on the EAD
• When the reversers are approximately 90% deployed, REV is displayed in green
• Built-in safety features should prevent uncommanded reverser deployment in-flight,
however, should this occur, the EEC will automatically reduce thrust on the affected
engine to idle – and red REV will be displayed

Question 12

Recall how to select EMERGENCY REVERSE power

Answer 12

• Emergency reverse thrust is obtained by pulling the reverse thrust levers through a
mechanical gate (and holding them in position)
• When selected, engine damage can occur, and a maintenance inspection will be
required
• Amber REV alerts will appear on the EAD in the EPR exceedance position while
green REV remains inside

Question 13

Recall function of the ENG EXCEEDANCE RESET Switch

Answer 13

The ENG EXCEEDANCE RESET button, when depressed, resets any exceedance
on the EPR, N1, TGT, and N2 primary engine synoptic displays

Question 14

Recall the APU starter motor duty cycle

Answer 14

Lim:
• The APU starter duty cycle is limited to three consecutive start attempts
• Wait 30 minutes prior to further start attempts

Question 15

Recall the normal and back-up fuel supply for the APU

Answer 15

• APU fuel is normally supplied from the right main tank
• Using crossfeed, fuel can be supplied from the left tank
• When center tank pumps are used to supply fuel to the APU (both pumps ON), a right
main tank fuel boost pump should also be operating
• When center tank fuel value is less than 800 pounds, using center tank pumps alone
can force air into the APU fuel line and cause APU flameout or prevent APU start

Question 16

Recall that an APU start incorporates an automatic delay

Answer 16

APU starts automatically delay approximately 40 seconds to allow the APU inlet door
to open

Question 17

Recall that APU bleed air is inhibited for two minutes after an APU start

Answer 17

APU bleed air is automatically inhibited until 2 minutes after an APU start is initiated

Question 18

Recall how the APU shutdown cycle is verified complete

Answer 18

After turning the APU MASTER switch OFF, ensure the APU shutdown cycle is complete
(inlet door closed) by verifying the absence of the APU information block on the SD ENG
display. This takes approximately 1 minute after APU RPM begins decreasing

Question 19

Recall considerations for shutting down the APU both with and without External Power
available

Answer 19

• With no external power, the BATT switch and EMER PWR selector must remain on
until APU shutdown is complete
• With external power connected, the EXT power switch or the GROUND SERVICE
ELEC PWR switch must remain ON until APU shutdown is complete

Question 20

Recall the APU continues to run for approximately 17 seconds while a No Power Break
Transfer is performed

Answer 20

• At normal shutdown, the APU continues to run for approximately 17 seconds while the
electrical system performs a No Break Power Transfer (NBPT)

• This delay is bypassed when the flight deck APU FIRE CONT toggle switch is moved
to the OFF & AGENT ARM position OR when the exterior ground APU toggle switch is
moved to the SHUT OFF position
• It is also bypassed if an APU fire is detected

Question 21

Recall the automatic shutdown features of the APU for both ground and in-flight faults

Answer 21

• On the ground, when conditions are present that could damage the APU, the APU
automatically shuts down and the amber APU AUTO SHUTDOWN alert is displayed
• In-flight, the APU only automatically shuts down for an APU OVERSPEED or an APU
COMPARTMENT FIRE. If an APU FAULT condition occurs in-flight, the APU
automatically shuts down 10 minutes after landing, unless shut down sooner by the
pilot