Engines, APU

Question 0

What is the required engine warm up period prior to applying T/O power?

Answer 0

Minimum of 3 minutes. Target is 5 minute warmup, but don’t delay takeoff if 3 minute warmup has been attained.

Question 1

What six conditions would lead to aborting an engine start?

Answer 1

-Oil pressure rise does not occur
-Fuel flow abnormally high or fluctuating
-EGT rising too rapidly or approaching limit, or if EGT fails to rise within
20sec of selecting RUN
-N1 fails to increase after EGT rise
-EGT quickly nears or exceeds the start limit
-The oil pressure indication is not normal by the time the engine is
stabilized at idle

Question 2

What is the required engine cool down time prior to engine shutdown?

Answer 2

3 minutes or gate arrival, whichever is less.

Question 3

When should the fuel control switch be placed to RUN during an engine start?

Answer 3

• verify N2 rotation and that the oil pressure increases

- when N2 is at 25%, or if 25% is not possible, at max motoring and a minimum of 18% in the 757, 15% in the 767.

Question 4

A magenta bug (fuel on command bug) appears at what N2 speed?

Answer 4

18% in the 757

15% in the 767

Question 5

What’s the APU starter duty cycle?

Answer 5

3 start attempts in 60 minutes

Question 6

Max altitude to use APU electrics?

Answer 6

Aircraft service ceiling

Question 7

Max altitude to use APU pneumatics?

Answer 7

Approximately 17,000ft

Question 8

What do EEC’s provide?

Answer 8

Over boost and overspeed protection, but no over temp protection

Question 9

What’s the primary indication for setting thrust on PW engines?

Answer 9

EPR

Question 10

What’s the primary indication for setting thrust on GE engines?

Answer 10

N1

Question 11

How can you cancel an APU shutdown if the APU has been selected OFF and the RUN light is still illuminated?

Answer 11

Momentarily move the APU selector to the start position.

Question 12

What does an illuminated APU RUN light signify?

Answer 12

APU is at operating speed

Question 13

What does an amber illuminated APU FAULT light indicate?

Answer 13

-the APU has automatically shut down
-the APU fuel valve disagrees with the commanded position
-the APU will auto shutdown for an APU Fire
NOTE: the FAULT light momentarily illuminates during APU start when the fuel valve is in transit.

Question 14

What is the engine starter duty cycle?

Answer 14

• 5 minutes continuous
• cool 30 sec per minute of starter operation
• after 2 consecutive 5 minute cycles, cool the starter for 10 minutes prior to each subsequent starter duty cycle

Question 15

What does an illuminated L or R ENG OIL PRESS light mean?

Answer 15

• respective oil pressure is at or below minimum

- oil pressure switch malfunction

Question 16

What are the oil quantity requirements?

Answer 16

• 17qts recommended for start
• if quantity is less than 17, verify 8qts at idle following engine warmup
• if less than 8 quarts following engine warmup, dispatcher approval required.

Question 17

How do you manually select a desired thrust reference mode?

Answer 17

Push the controls on the Thrust Mode Select Panel (TMSP)

Question 18

How can you verify the selected TMSP mode is active?

Answer 18

It will be displayed above the primary thrust reference (N1 or EPR as appropriate)

Question 19

What does the TEMP SEL knob on the TMSP do?

Answer 19

Rotates to select assumed temperature in lieu of using the FMS to enter an assumed temperature.

Question 20

If assumed temperature has been entered and normal thrust (takeoff power) is desired, how can this change be made with the TMSP?

Answer 20

Selecting TO/GA on the TMSP will eliminate the assumed temperature and select normal thrust (takeoff power).

Question 21

On the upper EICAS display, what does a TAI indication signify?

Answer 21

Thermal Anti-Ice

• green- engine anti-ice is on
• amber- engine anti-ice is on, but N1 too low

Question 22

Where is the EICAS TAT (total air temperature) displayed?

Answer 22

Upper EICAS. On the ground, TAT approximates OAT.

Question 23

How are engine exceedances displayed on the EICAS?

Answer 23

Current exceedances are displayed in red.

Max exceedances are displayed in white below the indicator.

Question 24

Engine start selectors: what does the GND mode do?

Answer 24

Push in and rotate-
Opens start valve to supply starter air
Arms selected igniter(s)
Selector magnetically held in GND position until 50% N2 RPM.

Question 25

Engine start selectors: how does AUTO mode work?

Answer 25

-Selector releases to auto at 50% N2 RPM
-Closes start valve and terminates ignition
-Selected igniter(s) operate continuously with LE slats extended or
engine anti-ice on.

Question 26

Engine start selectors: what does OFF mode do?

Answer 26

Provides no ignition.

Question 27

Engine start selectors: what does CONT mode do?

Answer 27

• selected igniter(s) operate continuously

- no time limit

Question 28

Engine start selectors: what does FLT mode do?

Answer 28

• both igniters operate continuously regardless of ignition selector position
• no time limit

Question 29

What is the function of the engine fuel control switches?

Answer 29

RUN - normal position for engine operation
- opens engine and spar fuel valves
- activates selected igniter(s)
CUT OFF- closes engine and spar fuel valves
- terminates ignition

Question 30

What are the indications for the thrust reverser system?

Answer 30

REV(amber)- the reverser is in transit

REV(green)- the reverser is fully deployed