Ch. 7 Engines, APU

Question 1

What does BB mean on the engine vibration source display?

Answer 1

Broadband

the source is unknown and average vibration is displayed

AOM 7.10.14

Question 2

What thrust rating does the Rolls Royce Trent 1000C have?

Answer 2

69800 pounds of takeoff thrust

AOM 7.20.1

Question 3

Which 7 conditions automatically show the secondary engine indications?

Answer 3

the display initially receive electrical power
a FUEL CONTROL switch is moved to CUTOFF in flight
an engine fire switch is pulled in flight
a secondary engine parameter is exceeded
engine N2 RPM is below idle in flight
a start selector is in START position
FUEL FLOW ENG L/R advisory is shown

cannot be cleared until the condition is no longer present.

AOM 7.20.2

Question 4

What does the amber line on the top of the TPR dial indicate?
Does the color of the indication change when you exceed it?

Answer 4

Maximum TPR limit
it does not change color when you exceed it

AOM 7.20.3

Question 5

What does the amber band on the EGT indication represent, and what happens if you exceed it during take off or go around?

Answer 5

max continuous limit.

EGT indications are inhibited during take off and go around for 5 mins.
*10 minus for single engine. It is acceptable to be in the amber band during take off and go around.

AOM 7.20.4

Question 6

What are the 2 EEC modes and which parameter do they use for setting thrust?

Answer 6

2, normal and alternate.
normal uses TPR as the parameter for setting thrust
alternate uses N1 RPM as the controlling parameter.

*TPR indication will be blank.

AOM 7.20.4

Question 7

What does the EICAS message ENG RPM LIMITED mean?

Answer 7

It is displayed when RPM limiting is in effect.

The EEC monitors N1, N2 and N3 rotor speeds and commands reduced fuel flow if any rotor speed approaches it redline limit.

AOM 7.20.7

Question 8

What is the Secondary air system (SAS)?

Answer 8

The engines are equipped with a SAS to provide cooling and sealing airflow to the intermediate pressure turbine. The system is monitored and controlled by the EEC.

AOM 7.20.7

Question 9

What is Thrust control malfunction accommodation?

Answer 9

Thurst control malfunction accommodation is an EEC function that provides protection against idle thrust asymmetry conditions while on the ground.

The EEC commands shutdown of the affected engine when the:
Airplane is on the ground
Thrust lever is at idle, and
Engine is above idle speed and not decelerating normally.

AOM 7.20.8

Question 10

What is Thrust asymmetry protection (TAP)?

Answer 10

TAP is an automatic feature that provides protection against aymmetric thrust during takeoff or go-around by limiting thrust on the higher thrust engine.

For an engine-out condition, TAP reduces thrust on the operating engine to ensure there is sufficient rudder for directional control.

TAP is only available when the flight controls are in normal mode, and the EEC is in normal or alternate modes.

AOM 7.20.9

Question 11

What are the different EEC idle selections?

Answer 11

Minimum idle:

Minimum idle is a lower thrust than approach idle. Minimum idle is selected for ground operation and most phases of flight.

Approach idle:

Is selected in fligth when:
The flaps are commanded to 25 or greater, or
the landing gear is selected DOWN.

Icing idle:

Selected with engine anti-ice ON.

Ice crystal idle:

OAT is between ISA and ISA +29C and altitude is between 35000’ and 5000’

AOM 7.20.10

Question 12

During an autostart, when does the EEC abort the autostart and does not make a second attempt?

Answer 12

Loss of both starters
No N1 rotation

AOM 7.20.12

Question 13

During an autostart, when does the EEC abort the autostart, but tries to make a second start attempt?

Answer 13

Compressor stall
Hot start
Hung start
Loss of one starter
No EGT rise
Start time exceeds the starter duty cycle timer

If one of the above conditions is detected the EEC turns off fuel and ignition and motors the engine for 20 to 30 seconds (depending on the detected condition) before making a second start attempt. Both igniters are used for the second start attempt.

On the ground there is a limit of 2 start attempts. Ther is no limit in the air.

AOM 7.20.13

Question 14

What does the Engine failure alert system do?

Answer 14

The engine failure alert system provides alerts when actual engine performance is less than commanded engine performance during a part of the takeoff and for other phases of flight.

a red ENG FAIL is displayed on both PFDs and ENG FAIL is displayed on both HUGs if actual thrust is less than commanded thrust during takeoff with airspeed between 65kts and 6kts prior to V1.

Is is accompanied by the voice annunciation “Engine fail” and the master WARNING lights illuminate.

AOM 7.20.21

Question 15

When can you start the APU without any pumps operating?

Answer 15

The APU is designed to be started with no pumps operating when on the ground or in-flight up to 14000’.

AOM 7.30.2

Question 16

How many APU starts can be attempted using the APU battery?

Answer 16

2 consecutive starts may be attempted, if the APU fails to start after the second attempt, a 5 minute cooling period must be observed before a third attempt is made.

AOM 7.30.2

Question 17

When does the APU automatically start?

Answer 17

In flight, if 3 or more engine generators go offline, the APU automatically starts.

7.30.3

Question 18

Which of the following is true about the EEC Alternate mode?

Answer 18

A. Thrust Limit protection is not provided.
B. N1 reference and target values are computed by the FMC.
C. N1 and N2 overspeed protection protection is available.

Question 19

Inflight, the EEC selects approach idle if:

Answer 19

A. Flaps are 25 or greater
B. Engine anti-ice is on.
C. Landing gear is selected down.

Question 20

The Autostart system monitors ____ during a ground start.

Answer 20

A. Compressor stalls.

C. Oil pressure.

Question 21

How will a low oil quantity condition be displayed on EICAS?

Answer 21

Reverses the display to show black numbers on a white background.

Question 22

Which of the following engine parameters is not monitored be the autostart system during engine start?

Answer 22

High oil temperature.

Question 23

Maximum rated thrust is available in any phase of flight by moving the thrust levers to the full forward position. The ____ provides N1 and N2 overspeed protection.

Answer 23

EEC

Question 24

While operating in the ATTENDED mode, the APU will not shut down for:

Answer 24

High EGT.

Question 25

If the N2 redline is exceeded, the red color around the digital indication can be reset to white (if the exceeded parameter has returned to normal) by pushing:

Answer 25

The Cancel / Recall switch.

Question 26

What does the “APU LIMIT” EICAS mesage mean?

Answer 26

An APU limit has been exceeded.

Question 27

How many starters are available to start the APU?

Answer 27

Two, electric only.

Question 28

In the attended mode, which of the following faults do NOT cause the APU to shut down immediately:

Answer 28

High EGT, High Oil Temperature, Low Oil Pressure.

Question 29

Can both engines be started simultaneously?

Answer 29

Yes, if using both APU generators as the power source

Question 30

The APU battery is designed to support _____ consecutive start attempts.

Answer 30

2

Question 31

What is the characteristic of B787 Engine? AOM 7.20.1

Answer 31

RR Trent 1000
3 Shaft, Hi Bypass Ratio Design with N1 Fan generating almost 90% of thrust
Thrust displayed by TPR
3 Shaft design helps to prevent compressor stall and shorten total length of the engine.
Trent 1000-C rated at 69,800lbs of thrust
The N2 (intermediate) rotor drives the engine accessory gearbox
Each Engine controlled by an EEC (powered by dedicated PMA with backup from 115v AC)

Question 32

What Kind of engine start malfunctions can occur on the B787?

Answer 32

• COMPRESSOR STALL
• HOT START
• HUNG START
• LOSS OF ONE STARTER
• NO EGT RISE
• START TIME EXCEEDS THE STARTER DUTY CYCLE TIME

Question 33

Engine failure after V1

What is the TAP? What is the TAMS?

Answer 33

Thrust asymmetry protection (Aom 7.20.9)
Automatic protection against asymmetric thrust during TO and go around by limiting thrust on the higher thrust engine
Reduces thrust on operating engine to ensure adequate rudder control Flight control must be in normal mode
EEC must be in normal or alternate mode
Thrust asymmetry minimum speed (Aom15.20.14)
Displayed on speed tape to give pilots situational awareness of minimum control speed with large thrust asymmetry
Varies with weight and cg but always at least 10KTS above minimum control speed for TO and Go around
When airspeed decreases to Tams. Aural alerts AIRSPEED AIRSPEED and master warning light illuminates

Question 34

Does climb performance go down with TAP operating?

Answer 34

No (Aom 7.20.9)
TAP does not affect certified TO performance. For airspeed where tap does limit thrust , climb gradient is higher than it would be if tap did not limit thrust This occurs because additional thrust asymmetry creates more airplane drag than the thrust that was added Therefore if TAP becomes active due to a speed below V2, any reduction in the climb gradient from that scheduled for the TO is due to mismanaged speed and not due TAP