Powerplant

Question 1

What is in the engine output shaft assembly?

Answer 1

A Sump
#1,2,3 Bearings

Question 2

Engine cable colors?

Answer 2

Green - Cockpit indication
Yellow - Power (DECU) and Control (HMU)
Blue - Torque and overspeed sensors

Question 3

Fuel bypass parameters?

Answer 3

30 micron
18-22 psid sensor closed
8-10 psid button pops

Question 4

What does the engine fuel boost pump pressurize fuel to?

Answer 4

45 psi

Question 5

When does the fuel pressure switch open?

Answer 5

Normally closed

Normal ops - opens when pressure increases to 10 - 11 psi

Question 6

How does the oil press transmitter receive power? Where is it measuring oil from and how?

Answer 6

ELC? 10Vdc?

Differential pressure between B sump scavenge and oil pressure in the accessory section

Question 7

Oil filter parameters? Bypass?

Answer 7

3 micron
Valve 80 psid across the filter
Red button pops at 44-60 psid
Bypass switch 60-80 psid - SP before bypass
Thermal lockout 100-130 F

Question 8

Scavenge lines per sumps?

Answer 8

A = 2
B = 1
C = 3

Question 9

Why is there a B sump check valve?

Answer 9

Prevent flooding to B sump during shutdown.

Question 10

When does the cold oil relief valve open? where does it go?

Answer 10

120 - 180 psi

Returns to AGB?

Question 11

During emergency operations, what bearings are lubricated by which sumps?

Answer 11

1-4 from A and B

Question 12

Oil cooler relief valve opens when?

Answer 12

22-28 psi

Question 13

Why is there no emergency oil for C sump components? or AGB?

Answer 13

AGB and C sump components can operate 6 minutes with residual oil.

Question 14

How do the engine firewall lovers work?

Answer 14

28 Vdc energized solenoid in directional control value, allows IPAS to closed the lover assembly.

Question 15

Where is the turbine speed control unit? Wired to?

Answer 15

2 Aft Avionics Bay ?

Question 16

Hughes valve name?

Answer 16

Inlet Anti-Ice valve

Question 17

GE valve name?

Answer 17

Anti-ice and Start Bleed valve

Question 18

When does the start bleed valve open?

Answer 18

During engine starts and low power settings

Question 19

What does the GE valve provide air to?

Answer 19

5th stage bleed air to swirl vanes, de-swirl vanes, nose splitter, and IGVs

Question 20

GE high power operations?

Answer 20

(High power) 28vdc energizes solenoid that allows air pressure to move a servo that overcomes spring pressure.
(Anti-ice) SP commands ELC1/2 to de-energize solenoid, spring opens valve.

Question 21

Where does the ENG CHOP msg come from?

Answer 21

Switch - SP - Relay (Utility Relay Panel) - DECU/TQ speed control - SP - EUFD

Question 22

(COL) What areas are monitored by the Fire Detection/Extinguishing System?

Answer 22

(Aft area) - Mast base support struts, Heat exchangers

Engines and APU

Question 23

Describe the overheat detectors

Answer 23

Alarm switch / Monitoring switch

Pressurized tube with helium gas

Question 24

When does the alarm switch close?

Answer 24

Approx. 350 degrees (Hydrogen expands)

Question 25

When does the monitoring (integrity) switch close?

Answer 25

40 psi - when tube looses pressure the switch closes (Helium leaks)

Question 26

(COL) What is the only fire message displayed on the EUFD?

Answer 26

DECK FIRE

Question 27

What does selecting fire detection test 1 test?

Answer 27

28Vdc Integrity Switch (3 overheat detectors) Aft flame detectors Amplifiers

Question 28

What does selecting fire detection test 2 test?

Answer 28

``` 28Vdc Alarm switch (3 overheat detectors) Fwd flame detectors Amplifiers Continuity circuit on all squibs (DISCH lights) ```

Question 29

How are the crossfeed valves controlled in the event of a fire?

Answer 29

corresponding FIRE button via battery bus

Question 30

How many overheat detectors are on the aircraft?

Answer 30

3

Question 31

How many flame detectors and amplifiers are there?

Answer 31

6 detectors / 3 amplifiers

Question 32

What does pressing the ENGINE FIRE button do?

Answer 32

Shuts of crossfeed valves (FIRE) button via battery power to off position Engine louver close via battery bus to actuator Bleed air louver actuates when battery power is removed APS blower and heating values shut down/close - SP - DECU (MUX) Removes Master caution and audio Squibs are armed (switch determines which one) DISCH lights are illuminated (if squib has not failed) RDY light indicates tasks are complete

Question 33

What does pressing the APU FIRE button do?

Answer 33

Shuts of APU fuel boost pump (and APU) Closes LCV APS blower and heating values shut down/close - SP - DECU (MUX) Removes Master caution and audio Squibs are armed DISCH lights are illuminated (if squib has not failed) RDY light indicates tasks are complete

Question 34

How are the flame detector amplifiers powered?

Answer 34

ENG1 = CBP1 | ENG2 and APU = CBP2

Question 35

Overheat detectors operation?

Answer 35

``` Alarm switch (inner / hydrogen) normally open (6" or more) Integrity switch (outer / helium) normally closed ```

Question 36

What bus is the LSC on? What components does it receive inputs from in fire operations?

Answer 36

Battery bus | SP, Fire/Ext panel, Amplifiers

Question 37

What will cause a DISCH light not to illuminate?

Answer 37

Bottle is not intact | Squib has failed