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A320 Limitations > APU Limitations > Flashcards

Flashcards in APU Limitations Deck (22)
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1

%N for amber font

102%

2

%N for auto shutdown

107% or greater

3

EGT for amber font

within 33C of current max EGT

4

EGT for auto shutdown

computer calculated

5

%N for AVAIL

99.5% or 95% for > 2 seconds

6

Min batt voltage to start

25.5V, if less charge for 20 mins

7

When can you press APU START?

5 seconds after MASTER SW has been depressed and no LOW OIL LEVEL advisory

8

Max START EGT?

1000C

9

Max operating EGT?

700C

10

When can you NOT check for the LOW OIL LEVEL during APU start?

Battery starts

11

After turning batteries to AUTO how much time do you have to start the APU?

30 minutes

12

After the batteries have been on for 35 minutes how much batt capacity is remaining?

<25%

13

Approx how long until APU available after start is engaged?

~1 minute

14

After AVAIL extinguishes during shutdown, how long do you leave batteries on for?

2 minutes

15

Max service ceiling

FL390

16

Max altitude to start on batteries only

FL250

17

Max altitude to power one AC pack

FL200

18

Max altitude to power two AC packs

FL150

19

APU starter limit

After 3 consec starts attempts allow 60 minutes for cool down

20

Max alt to start engines

8,000 ft

21

Max alt for APU anti-ice

TRICK, you can't use APU for anti-ice

22

What is the cooling period for emergency shutdown?

None