APU STDY 01: General overview

Question 1

(Warnings)

Prior to operating the bleed air system what area must be cleared of personnel & equipment?

Answer 1

Prop area

must be cleared for all four engines before pressurizing the bleed air manifold.

Question 2

Start light out at ___% rpm

or __ min

Answer 2

35% rpm

Or

1 min

Question 3

APU oil is serviced to how much?

IAW 1C-130H-2-12JG-10-2, 12-15-01

Answer 3

6 quarts

4 in the tank

2 in the lines

Question 4

How many anti-ice lights are tested?

Answer 4

7

Question 5

Why is it important to wait 4 min prior to an APU restart?

1min on 4min off

Answer 5

To ensure the turbine stops rotating & the RPMs are at zero.

Question 6

(Cautions)

What is the starter motor duty cycle for the APU?

Answer 6

Do not exceed the starter motor duty cycle of

1min on & 4min off

Question 7

When operating AC systems, at what decibels do u require hearing protection?

Answer 7

0-84 -no hearing protection

85-109 - single hearing protection

110 & up - double hearing protection

Question 8

How many fire handles are there?

Answer 8

1 for each engine and 1 for the APU.

Question 9

TO & page for Emergency Shutdown Procedures.

Answer 9

49-00-3 (pg-62)

Question 10

Cargo door handle clockwise to

Answer 10

3n or 6n

Question 11

During run tach indicates _____RPM +-___

Answer 11

100RPM (+-2)

Question 12

Ensure ____lbs in No.2 tank.

Answer 12

2,000 lbs

Question 13

If No.2 tank does not have 2000 lbs you need to turn the ____ ____ on.

Answer 13

Boost pump

Question 14

If outside temp is 32 degrees F or lower, wait __minutes to ____ _____.

Answer 14

…wait 4 minutes to apply load.

Question 15

Allow APU to run with ____ ____ for __ minutes after on-spread light is on.

Answer 15

…with no load for 2 minutes.

Question 16

Verify ___ ___ is reading ____V and FEQ is reading 400+-20Hz

Answer 16

APU GEN is reading 115+-3V

Question 17

MIN B/A Press =

Answer 17

35PSI

Question 18

Bleed down:

• Start timing when press drops to 30PSI
• End time at 15PSI

What are the time limits?

Answer 18

8.5 sec = prior to 83-846

16 sec = 83-846 and up

Question 19

APU GEN is reading 115+-3V and FREQ is reading ____+-___Hz.

Answer 19

FEQ is reading 400+-20Hz

Question 20

If the START light does not go out within one minute, place ____ sw to STOP.

Answer 20

APU CNTR/ APU

Question 21

What lights do you observe when first starting the APU?

Answer 21

START light, ON SPEED LIGHT, tachometer, and EGT indicator.

Question 22

What light is always on during the run?

Answer 22

the DOOR OPEN light.

Question 23

the EGT (exhaust gas temp) should never go above how many degrees?

Answer 23

620 degrees Celsius

Question 24

If the START light does not go out within one minute, place ____ sw to STOP.

Answer 24

APU CNTR/ APU

Question 25

What lights do you observe when first starting the APU?

Answer 25

START light, ON SPEED LIGHT, tachometer, and EGT indicator.

Question 26

What light is always on during the run?

Answer 26

the DOOR OPEN light.

Question 27

the start light goes out when?

Answer 27

within one minute or 35 seconds

Question 28

TACH indication indicates how many RPMs during the run?

Answer 28

100 +-2

Question 29

during the run once the START light goes out the _____ light should comes on.

Answer 29

ON-SPEED light

Depending on the airplane the light may flicker on at the same time but generally once the START light goes out it is on-speed and the ON-SPEED light comes on.

Question 30

What is the preferred method for starting the APU,BAT, or external power?

Answer 30

Use BAT power only when external power is not available.

Question 31

If isolated DC power is interrupted while the APU is operating the control circuit will be opened and cause the APU to stop; what should you do,

Answer 31

Place the APU Control switch to stop and wait 4 minutes prior to starting procedures.

Question 32

What must be removed prior to AC operation?

Answer 32

Plugs must be removed.

Question 33

Is it acceptable to run the APU with frost in the inlet?

Answer 33

Yes.

DO NOT operate the APU with ICE or FOREIGN material in the inlet or on the inlet screen or with ice on the governed… FROST on the inlet SCREEN is acceptable.

Question 34

What must be monitored during the operation of APU Bleed air?

Answer 34

Leading edge TEMP INDICATORS

&

BLEED AIR

Question 35

What 4 switches do you turn on during a bleed down?

Answer 35

The 4 ENG BLD AIR REG sw’s

Question 36

If bleed air pressure drops rapidly or

there is other evidence of excessive duct leakage what do you do?

Answer 36

APU must be shut down immediately and the problem corrected before proceeding.

Question 37

Monitor BLEED MANIFOLD PRESS gage during APU operation. If gage shows evidence of _____ _____ shut down the APU.

Answer 37

Duct failure

Question 38

Monitor _____ _____ ______ gage during APU operation. If gage shows evidence of duct failure, shut down the APU.

Answer 38

BLEED MANIFOLD PRESS gauge

Question 39

Do not exceed the starter motor duty cycle of one minute

on, four minutes off. Do not attempt to reengage the starter as long as the _____ is rotating.

Answer 39

APU

Question 40

Starting APU with control air _____ _______ open will reduce fuel flow and RPM and increase start time. Do not exceed the starter motor duty cycle of one minute on, four minutes off.

Answer 40

pressure valve

Question 41

How is fuel fed into the APU?

Answer 41

Gravity fed

Question 42

Why Do you NOT allow the APU to dwell at speeds between 1696 and 3186 RPM range any longer than necessary.

Answer 42

Excessive vibration that may damage the APU is more likely in this speed range.

Question 43

Which t-handle only shows fire?

Answer 43

APU