Engines and APU

Question 1

What is the meaning of the FLAP OPEN indication on the ECAM APU page. What happens when the Flap Fully Opens?

Answer 1

1) APU Air Intake Flap is Fully Open

2) APU starter motor is inhibited until the flap is fully open

Question 2

What is the meaning of the LOW OIL LEVEL indication on the ECAM APU page. When would this appear?

Answer 2

1) APU oil tank quantity is sensed to be low
2) The indication would appear immediately when the APU MASTER SW pb is selected to ON and the aircraft is on the ground

Question 3

What should you do if the LOW OIL LEVEL is indicated on the ECAM APU page on the ground

Answer 3

Don’t start the APU and contact maintenance for assistance.

Question 4

What indications will you get when the APU is “ON SPEED”

Answer 4

1) AVAIL appears on the APU START pb and ECAM APU page

2) APU AVAIL appears on the ECAM Memo Section

Question 5

What happens when the APU MASTER SW pb is turned ON

Answer 5

1) APU computer is enabled and performs a self test

2) Air Intake flap is commanded open

Question 6

What happens when the APU MASTER pb is set to OFF or “Light Out”

Answer 6

APU computer is deactivated and APU shuts down (Normal Shutdown Sequence)

Question 7

When will the APU MASTER pb show a FAULT

Answer 7

Automatic shutdown or failed start has occurred

Question 8

Why must the aircraft batteries be on for all APU starts and when the APU generator is the sole source of electrical power

Answer 8

1) Permits the APU starter motor to connect to the aircraft battery buses, which are the only power source available to the starter motor

2) On the ground, in the event of an APU fire while the APU generator is the sole source of power, the batteries being on ensure a power source for proper APU shutdown and extinguisher discharge

Question 9

What is the function of the APU BLEED pb and APU GEN pb

Answer 9

1) APU BLEED pb - When ON commands the APU bleed valve open

2) APU GEN pb
- “Light Out” APU generator will automatically energize once APU is on speed
- OFF - APU Gen is de-energized

Question 10

What can APU bleed air be used for and NOT used for

Answer 10

1) Can be used for Engine Starts and AC Pack operation

2) Cannot be used for Wing Anti- Icing

Question 11

What start malfunction can a FADEC not sense and therefore not automatically abort. How do you manually abort this?

Answer 11

Tailpipe Fire. Manually Abort by placing the respective ENG MASTER switch to OFF

Question 12

How is continuous Ignition manually activated. What is the only indication that the system is active

Answer 12

After an engine start, cycle the ENG MODE selector from NORM to IGN/START.

IGNITION will appear in the memo section of the E/WD

Question 13

How are the ignitors displayed on the ECAM ENGINE page

Answer 13

1) A or B appear at the lower portion of the page indicating which is the active ignitor

2) AB together indicates both ignitors are being used for that engine start or continuous ignition is active

Question 14

Will FADEC independently alternate which ignitor is used with each start

Answer 14

Yes

Question 15

What do the following E/WD N1 gauge’s indications mean

1) Green
2) Amber Tick Mark
3) Red Arc
4) Circle
5) Blue Arc
6) Boxed Amber Rev
7) Boxed Green Rev

Answer 15

1) Green - Digital and Analog N1 speeds
2) Amber Tick Mark - FADEC computed MAX N1 for current ambient conditions
3) Red Arc - Max permissible
4) Circle - Current position of associated TL
5) Blue Arc - difference between actual N1 and thrust commanded by the auto-thrust system
6) Boxed Amber REV - one or more of the blocker doors is not stowed or locked
7) Boxed Green Rev - all four blocker doors are fully deployed

Question 16

What does the grey background on the N2 display on the E/WD mean

Answer 16

Engine start sequence is in progress. When sequence is completed or aborted grey background is removed

Question 17

What do the positions of the ENG MASTER 1(2) switches mean

Answer 17

1) ON - initiates the automatic start sequence when ENG Mode Selector is set to IGN/START

2) OFF - shuts down the engine or aborts the start sequence

Question 18

What do the positions of the ENG MODE selector mean

Answer 18

1) NORM - normal operations following engine start

2) IGN/START - Selected Prior to all engine starts
- Displays the ECAM ENGINE page on SD
- Activates both FADECs
- Commands both pack valves to close for 30 secs
- Increases APU speed (if being used)
- Provides continuous Ignition following an engine start when cycled from the NORM position

3) CRANK - selected to Dry Crank/ Ventilate the engine
- No Fuel or Ignition supplied
- Displays ECAM ENGINE page on SD
- Activates both FADECs

Question 19

When will the Fire or Fault pbs illuminate

Answer 19

1) FIRE - When engine fire has been detected
2) FAULT - When automatic start has been aborted (FADEC start fault) or there is a disagreement between the HP fuel valve and commanded position

Question 20

is there a relationship between the FIRE and FAULT indications?

Answer 20

No, they are separate

Question 21

What occurs when an ENG MAN START pb is selected ON

Answer 21

1) The respective engine start valve opens provided the ENG MODE selector is in IGN/START or CRANK and Bleed air Pressure is available

2) The respective start valve will automatically close at approx. 50% N2 but the ON light remains illuminated until re-selected

Question 22

Describe the ignitor behavior during automatic versus manual starts

Answer 22

1) Automatic - engine ignitors alternate between starts and FADEC automatically controls the ignition

2) Manual - both ignitors are activated ONLY AFTER the engine master switch has been selected on.

Question 23

When is the Intake Flap commanded Open?

Answer 23

Flap is commanded open when APU MASTER SW pb is selected ON