PowerPlant

Question 1

How many IIDS screens are there?

Answer 1

3

Question 2

What is a RADU?

Answer 2

Remote Data Acquisition Unit
Collects aircraft data and sends it to the IIDS screens.

Question 3

What is Max T/O N1? (5 mins)?

Answer 3

100%

Question 4

What are the AEO N1 Limits?

Answer 4

• Max Con - 97.8%
• Takeoff (5min) - 100%

Question 5

What are the OEI N1 Limits?

Answer 5

• Max Con - 100%
• 2 min - 101.2%
• 30 sec - 104.6%

Question 6

What is VBROC?

Answer 6

74kts

Question 7

What are the engine AEO Tq Limits?

Answer 7

• Max con - 104%
• Take off - 104% (5 min)

Question 8

What is the N1 avoid range?

Answer 8

53-62% N1

Question 9

What are the OEI Engine Tq limits?

Answer 9

• Max con 116%
• 2 Min 127%
• 30 Sec 135%
• 20 Sec 160% (Transient)

Question 10

What are the AEO N1 and Tq limits?
N1 T/O
N1 MCP
Q T/O
Q MCP

Answer 10

N1 T/O 100% (5 mins)
N1 MCP 97.8%
Q T/O 104%
Q MCP 104%

Question 11

WHat constitutes a successful N1 Test?

Answer 11

• within +/- 0.2%
  (Test number is RADU, the normal displayed number is DECU number)

Question 12

Max Con T5?

Answer 12

750°C

Question 13

What order are the Warnings and Cautions displayed?

Answer 13

Chronological order with the most recent on top.

Question 14

How many igniters per engine?

Answer 14

2

Question 15

What is driven by the Accessory gear on the engine
(SOFA)

Answer 15

• Starter
• Oil Pump
• Fuel Pump
• Alternator - (DECU >60-65%N1)

Question 16

What part of the engine drives the engine cooler?

Answer 16

N2 (Reduction Gearbox)

Question 17

What are the modules of the engine?

Answer 17

1 - Tx shaft & Accessory Gearbox
2 - Axial compressor
3 - Gas generator (includes the cent. comp.)
4 - Power Turbine
5 - Reduction gearbox

Question 18

What is on the accessory gearbox?

Answer 18

• Starter / generator
• Alternator
• FCU (Pump and metering)
• Oil pump

Question 19

How is the Engine Accessory gearbox driven?

Answer 19

• Off the compressor module (2)

Question 20

What is the most common DECU failure?

Answer 20

Stuck DECU
(metering needle not moving)

Question 21

What functions does the DECU have?

Answer 21

• Starting
• Maintaining 107%Nr
• Overspeed Protection and monitoring (122.5 N2)
• OEI Limiting (30min, 2min, MCP)
• Soft Limiting (Reduces 100.5% momentarily)
• Ramping Function (101-106 Nr up to 105% Tq)
• Blowaway (100% Nr or 5% per second delay below 104%)

Question 22

What are the Nr and Tq parameters for the following?
1. Soft Limiting
2. Ramping
3. Blowaway

Answer 22

1. Soft - 106-107% Nr permits 100.5 N1 momentarily
2. Ramping - 101-106% Nr permits 105 N1
3. Blowaway - <101% Nr OR <104%Nr with -5%Nr/sec - 2 Min OEI rating released

Question 23

What is a DECU MAJOR Fault?

Answer 23

Stepper motor frozen

Question 24

When does the OS light go out on engine start?

Answer 24

<25%

Question 25

When does O/S activate?

Answer 25

122.5% N1

Question 26

When does the Bleed Valve Open and Close?

Answer 26

- OPEN Below 80% N1 - CLOSED Above 98% N1