Power Plant/APU

Question 1

FLAP OPEN and LOW OIL LEVEL indications on the ECAM APU page.

Answer 1

FLAP OPEN:

▪ APU air intake flap is fully open.
▪ Flap is commanded open when APU MASTER SW pb is selected to ON.
▪ APU starter motor is inhibited until flap is fully open.

▪ APU’s oil tank quantity is sensed to be low.
▪ Indication would appear immediately when the APU MASTER SW pb is selected to ON and the aircraft is on the
ground.

NOTE: With LOW OIL LEVEL indicated, the APU START pb should not be selected to ON. Contact maintenance for assistance.

Question 2

Indications when the APU is “On-Speed”.

Answer 2

AVAIL appears on apu start pb and ecam apu page

APU AVAIL appears on ECAM Memo section

Question 3

APU MASTER SW pb.

ON

Lights out

Fault

Answer 3

ON: apu computer performs self-test
air intake flap opens

Light out: apu computer deactivated at apu shuts down

Fault: auto shutdown or failed start has occured

Question 4

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

Answer 4

Connects apu starter motor to the battery buses (the ony power source available to the starter motor)

On the ground, batteries provide power source for extinguisher discharge

Question 5

APU BLEED pb and APU GEN pb.

Answer 5

APU BLEED: on commands apu bleed valve open

APU GEN: lights out, apu gen with auto energize once apu is on speed

OFF: apu gen is de-energized

Question 6

uses of APU bleed air.

Answer 6

engine start and air conditioning pack operation

cannot be used for wing anti-ice

Question 7

which start malfunction a FADEC cannot sense and therefore cannot automatically abort.

Answer 7

tailpipe fire

Question 8

Recall how Continuous Ignition can be manually activated.

Answer 8

after engine start, cycle ENG MODE selector to norm then back to IGN/START

NOTE: IGNITION appears in the memo section of the E/WD when continuous ignition is active

Question 9

Recall the engine igniter displays on the ECAM ENGINE page.

Answer 9

displayed as A and B on ECAM ENGINE page

alternates between starts

AB indicates both igniters being used for continuous ignition

NOTE: FADECs independently alternate which igniter is used with each start. For example, if igniter A was used for the first start, then igniter B would be used for the next start. FADECs do not match each other’s igniter selection.

Question 10

Recall the E/WD N1 gauge’s indications.

▪ Green

▪ Amber tick mark

▪ Red arc

▪ Circle

▪ Blue arc

▪ Boxed amber REV

▪ Boxed green REV

Answer 10

▪ Green digital numeric N1 speed and analog green line N1 speed.

▪ Amber tick mark – FADEC computed maximum N1 for current ambient conditions.

▪ Red arc – maximum permissible.

▪ Circle – current position of the associated thrust lever.

▪ Blue arc – indicates the difference between actual N1 and the thrust commanded by the autothrust system.

▪ Boxed amber REV – one or more of the reverser blocker doors is not stowed or not locked.

▪ Boxed green REV – all four reverser blocker doors are fully deployed.

Question 11

meaning of the grey background of an N2 display on E/WD.

Answer 11

engine start in progress

Question 12

functions of the controls and indicators on the ENG panel.

ENG MASTER 1(2) switches:

Answer 12

ON – initiates the automatic start sequence when ENG MODE selector is set to IGN/START

▪ OFF – shuts down the engine or aborts the start sequence

Question 13

ENG MODE selector:

NORM

IGN/START

CRANK

Answer 13

NORM: normal operations following engine start

IGN/START: displays ECAM ENGINE page
activates both fadecs
pack valves close for 30 seconds
increases apu speed
after engine start, cont ignition

CRANK: no fuel of ignition supplied
displays ECAM ENGINE page
activates both fadecs

Question 14

ENG panel Fault light

Answer 14

auto start aborted

disagreement between HP fuel valve commanded position and actual position

Question 15

Explain what occurs when an ENG MAN START pb is selected ON.

Answer 15

engine start valve opens if

IGN/START or CRANK is selected
bleed air pressure available

engine start valve closes at 50% N2 but ON light remains

Question 16

Describe igniter behavior during automatic versus manual starts.

Answer 16

▪ Automatic starts – engine igniters alternate between starts (A or B).
▪ Manual starts – both igniters are automatically activated (AB)

Question 17

Describe the position of the EGT Limit tick mark (amber) on the EGT display during and after engine start.

Answer 17

During start: tick mark represents EGT limit

After start: tick mark represents MCT EGT limit