Block 4 - EA-18G Power Plants

Question 1

Model type engine used in the Growler

Answer 1

F414-GE-400

Question 2

Three modes of operation for the Auxiliary Power Unit (APU)

Answer 2

1) GMM - Ground
2) MES - Main Engine Start
3) ECS - Environmental Control System

Question 3

Purpose of the In-Flight Refueling (IFR) probe

Answer 3

Allows for refueling while flying

Question 4

What does the Aircraft Fuel Storage System consist of?

Answer 4

• 4 main bags/fuel cells
• 2 wing tanks
• 5 external drop tanks

Question 5

Purpose of the foam-lined wing tanks

Answer 5

Allows aircraft to self seal small external damage

Question 6

What does the Secondary Power Systems consist of?

Answer 6

• Auxiliary Power Unit (APU)
• Airframe Mounted Accessory Drive (AMAD)
• Secondary Power Compressed Air

Question 7

Purpose of the APU

Answer 7

Gas Turbine Engine; Supplies air to ECS

Question 8

Purpose of the AMAD

Answer 8

Transmits power to engine for starting

Question 9

Purpose of Secondary Power Compressed Air

Answer 9

Provides pneumatic power for operating the ECS

Question 10

What are the related systems in the Power Plant?

Answer 10

• Ignition
• Lubrication
• Main Fuel
• Afterburner Fuel
• Variable Exhaust Nozzle (VEN)
• Variable Geometry
• Anti-Icing
• Full Authority Digital Engine Control (FADEC)
• Throttle

Question 11

Explain VEN

Answer 11

Cam and link-positioned hinged-flap, convergent-divergent nozzle mounted to the aft end of the afterburner case.

Helps push exhaust gases out the plane

Question 12

Explain Variable Geometry

Answer 12

Consists of Fan Variable Geometry (FVG) and Compressor Variable Geometry (CVG)

• FVG provides better efficiency of the fan
• CVG provides better efficiency of the compressor

Question 13

Explain Full Authority Digital Engine Control (FADEC)

Answer 13

Receives aircraft and engine sensor information and determines what will help the engine operate to its full potential

Question 14

Components driven by the AMAD

Answer 14

Used to drive:

• Fuel boost / Motive flow pump
• Electrical generator
• 3000/5000 psi hydraulic pump

Question 15

How does the AMAD interface with the APU and engine?

Answer 15

Pneumatically connected to APU through the Air Turbine Starts (ATS)

Question 16

Safety precautions that must be observed during engine ground turn-up

Answer 16

• PPE is required
• Distance of 9 ft radius from intakes
• 25 ft radius at MIL or MAX to prevent being pulled in

Question 17

Safety precautions that apply to fueling and defueling

Answer 17

• PPE is required

- Must not be done within 100 ft of radio equipment or 300 ft from ground RADAR equipment