APU

Question 1

What is the APU type?

Answer 1

RE 220

Question 2

What occurs when the APU
run switch is returned to the
RUN position prior to the
60-second cooldown period?

Answer 2

The APU rpm returns to 100%

Question 3

How many start attempts

are permitted for the APU?

Answer 3

3 per hour

Question 4

Name the four ways the APU can be

shut down during an emergency.

Answer 4

1. APU fire DISCH handle pulled,
2. APU SHUT OFF button
   (external services panel) pushed
3. BATT MASTER switch selected OFF
4. APU SHUTDOWN switch
   (APU compartment) pushed

Question 5

What is the maximum electrical load rating for the APU generator?

Answer 5

40 KVA

Question 6

When does the APU door

position display on the EICAS?

Answer 6

When the FADEC detects

an inlet door fault

Question 7

When is use of the oil

replenishment system prohibited?

Answer 7

When the OAT is

less than or equal to -12°C

Question 8

What is the maximum

starting altitude for the APU?

Answer 8

37,000 feet

Question 9

How are electrical loads given priority?

Answer 9

APU FADEC cycles the

load control valve (LCV) closed

Question 10

When is it recommended

to top up the APU oil reservoir?

Answer 10

When the STATUS page

indication of less then 4.5 qts

Question 11

What pilot action must be taken
if the APU is powering
an AC bus above 37,000 ft?

Answer 11

The associated hydraulic

ACMP must be selected off

Question 12

What is the APU shutdown RPM
requirement before turning off
the BATT MASTER switch?

Answer 12

RPM less than 76%

Question 13

What is the maximum altitude
for bleed-air extraction from
the APU?

Answer 13

30,000 feet

Question 14

What is the maximum OAT for
bleed-air extraction from the APU
for air conditioning?

Answer 14

OAT 45°C

Question 15

What is the maximum altitude

for APU operation?

Answer 15

45,000 feet

Question 16

What is the minimum temperature
for starting a cold-soaked APU
on the ground?

Answer 16

-40°C

Question 17

Name one of the three conditions that
would cause the manual operation
of the APU LCV impossible.

Answer 17

Anti-ice active, left engine pressure regulating valve is

manually opened, right engine pressure regulating valve and crossbleed valve are manually opened

Question 18

What is the time limitation
for replenishing the APU
oil system?

Answer 18

A minimum of 15 minutes after APU shutdown

Question 19

What is the maximum APU RPM?

Answer 19

106%

Question 20

What conditions must be met to replenish the APU oil system

Answer 20

Aircraft on the gnd with power available to the Batt Bus
APU shutdown for at least 15mins
Oil reservoir is above 1.5 qts
both engines shut down and not being replenished