Unit 5

Front 1

What is mounted to a drive pad on left side of No. 2 & 3 engine RGB?

Back 1

Engine Driven Compressor

Front 2

What type of compressor do we utilize?

Back 2

Single Stage Centrifugal Air Compressor with fully automatic controls

Front 3

What are the 2 different models that supply the aircraft with air at a constant flow rate?

Back 3

1. 101 horsepower maximum drive power at 72lb per min air flow
2.81 horsepower maximum drive power at 64lb per minute air flow.

Front 4

What is splined to RGB, drives the EDC, and contains worm gear and shear section?

Back 4

Input Shaft

Front 5

What is located at Drive end of EDC, mechanically disconnects EDC from RGB in the even of a malfunction?

Back 5

Compressor Disconnect

Front 6

To prevent dame to the EDC/RGB during disconnect, the engine must be operating in __________ RPM range.

Back 6

Normal

Front 7

What is the power source for Compressor Disconnect (EDC Disconnect Solenoid)

Back 7

MEDC

Front 8

What drives the oil pump and compressor Torsion Shaft (Quill Shaft) that drives the compressor impeller wheels and is direct step - up type?

Back 8

Gear Train

Front 9

What is located in scroll assembly, creates air flow, and is single stage impeller splined to torsion (Quill) shaft?

Back 9

Centrifugal Compressor

Front 10

What is in respective engine air intake scoop?

Back 10

Intake

Front 11

What is constructed in 2 pieces and bolted together around impeller to form inlet and discharge ducts for compressor?

Back 11

Scroll Assembly

Front 12

What is in the middle of scroll assembly and receives air from engine air intake?

Back 12

Inlet Duct

Front 13

What is located int he EDC inlet, controls amount of air flow through compressor, and is pneumatically controlled, hydraulically actuated and spring loaded closed?

Back 13

Pre-Swirl Vanes (Inlet Flow Control Vanes)

Front 14

What is located output side of compressor and direct discharge air into the aircraft?

Back 14

Discharge Duct

Front 15

Where do the Rake Tubes send pneumatic reference signals to?

Back 15

Flow Control Sensing Head (Pre-Swirl Controller) and
Surge Control Sensing Head

Front 16

What does the overboard discharge duct that discharges air overboard to reduce back pressure incorporate?

Back 16

Flapper Check Valve

Front 17

What is located in the discharge duct and prevents compressor surges when discharge air is restricted allowing compressor discharge air to flow overboard?

Back 17

Dump Valve

Front 18

How is the Dump Valve operated, what is it controlled by and what position is it spring loaded to?

Back 18

Hydraulically operated
controlled by surge control servo valve and dump solenoid valve
spring loaded open

Front 19

What holds a supply of oil for EDC operation?

Back 19

Oil Sump

Front 20

What is the wet sump capacity and compressor capacity?

Back 20

0.7 Gal
1.0 Gal

Front 21

What ensures positive oil flow for lubrication and control if the oil cooler becomes clogged?

Back 21

Oil Cooler Bypass Valve

Front 22

What is at the bottom of the nacelle and is used to cool EDC oil?

Back 22

EDC Oil Cooler

Front 23

EDC Oil cooler is what type of heat exchanger ?

Back 23

oil -to - oil

Front 24

At what temperature does the Temp High signal light illuminate?

Back 24

121*C

Front 25

True or False
The oil filter is NOT bypassable

Back 25

False

Front 26

At what pressure does the Press Low signal light illuminate?

Back 26

Below 50 psi

Front 27

What ensures variable pressure in air flow control cylinder do not effect other oil system functions?

Back 27

Flow Control Metering Orifice

Front 28

What hydraulically positions the pre-swirl vanes?

Back 28

Air Flow Control Cylinder

Front 29

What controls the amount of oil pressure in the air flow control cylinder and is pneumatically controlled by flow control sensing head?

Back 29

Flow Control Servo Valve

Front 30

What controls the position of the pre-swirl vanes in order to maintain constant volumetric output of compressor?

Back 30

Flow Control Sensing Head (Pre- Swirl Controller)

Front 31

What positions the flow control servo valve to increase or decrease flow control cylinder pressure that is positioning the pre-swirl vanes?

Back 31

Flow Control Sensing Head (pre-swirl controller)

Front 32

What prevents variable dump valve actuating cylinder pressure form effecting the air flow control cylinder?

Back 32

Pressure Ratio Metering Orifice

Front 33

What hydraulically positions Dump Valve?

Back 33

Dump Valve Actuating Cylinder

Front 34

What controls position of the surge bleed valve by sensing static and total discharge air pressures to dump excessive EDC output overboard?

Back 34

Surge Control Sensing Head

Front 35

What prevents excessive back pressure at the EDC?

Back 35

Surge Bleed Valve

Front 36

What ports dump valve actuating cylinder pressure to sump allowing spring pressure to open the dump valve?

Back 36

Dump Solenoid Valve

Front 37

Is the Dump Solenoid Valve spring loaded open or closed?

Back 37

Closed

Front 38

True or False
The Firewall SOV does not have to be fully opened for EDC's to dump

Back 38

False
Has to be fully opened

Front 39

What reduces excessive back pressures at the EDC by limiting use of air cycle cooling system?

Back 39

Pressure Ratio Limiter (PRL)

Front 40

What isolates the EDC from the supply duct in the event ofan engine/EDC malfunction or fire?

Back 40

Firewall Shut-Off Valve

Front 41

What provide independent temperature control for cabin and flight station air cycle cooling Station (ACCS)?

Back 41

Temperature Programers