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FAA Flight Engineer Turbojet (Added Rating) Knowledge Test Practice Test

The FAA Flight Engineer Turbojet (Added Rating) Knowledge Test (FEN) addresses turbojet engine operation and aircraft systems monitored by a flight engineer. Practice-bank questions sample compressor and turbine components, combustion, exhaust, lubrication, engine controls, hydraulics, fire detection, and auxiliary power. They also touch on interpreting indications as thrust changes and recognizing conditions that may require investigation.

Exam overview

Exam providerFederal Aviation Administration
Exam codeFEN
CategoryAviation

About the FAA Flight Engineer Turbojet (Added Rating) Knowledge Test Exam

Flight-engineer work requires connecting system indications to how the aircraft and its engines are operating. Relevant concepts include compressor airflow, stable combustion, turbine and exhaust functions, oil-pressure monitoring, and the effects of changing thrust. Aircraft-system questions also sample hydraulic pressure relief, control-linkage and electrical-connection condition, nacelle fire detection, and ram-air turbine use. A constant-speed propeller governor appears among the bank’s topics, illustrating the need to distinguish engine functions from propeller-control functions. When reviewing an item, identify the component’s purpose, the operating condition it serves, and what an abnormal indication or defect could mean for continued operation. This systems-based reasoning supports accurate monitoring and communication with the flight crew; the sampled questions do not establish official topic coverage or weighting.

Sample Practice Questions

Review a selection from this exam's published US Practice Tests practice bank.

Question 1

Why are turbine-engine compressor blades and disks inspected for damage or contamination?

  1. ADamage or deposits can reduce efficiency and may contribute to structural failure
  2. BContamination increases the engine's rated thrust in all conditions
  3. CBlade condition determines cabin oxygen concentration
  4. DInspection is needed only to verify paint color
Show answerCorrect answer: A

Compressor airfoils operate under significant aerodynamic and mechanical loads. Erosion, foreign-object damage, or deposits can impair airflow and performance and may create risks that require maintenance evaluation.

Question 2

Why is an engine oil-pressure indication below its normal range a concern?

  1. AIt may indicate inadequate lubrication or a problem in the oil system
  2. BIt proves that the engine is producing excessive thrust
  3. CIt indicates that the fuel-air mixture is too rich
  4. DIt is a normal result of increased compressor pressure ratio
Show answerCorrect answer: A

Oil pressure helps ensure that lubricant reaches engine bearings and other components. An abnormally low indication can signal inadequate lubrication or an oil-system fault and should be handled in accordance with the applicable checklist and procedures.

Question 3

What is the principal purpose of a turbine-engine exhaust nozzle?

  1. ATo convert exhaust-gas energy into a high-velocity jet that produces thrust.
  2. BTo maintain a constant fuel-air ratio in the combustor.
  3. CTo remove oil mist from the engine lubrication system.
  4. DTo reverse compressor rotation during shutdown.
Show answerCorrect answer: A

The nozzle accelerates exhaust flow rearward. The resulting change in momentum produces forward thrust, with the nozzle design matched to the engine and operating conditions.

Question 4

What is the principal purpose of an aircraft hydraulic-system relief valve?

  1. ATo limit system pressure by allowing fluid to bypass when pressure exceeds its setting
  2. BTo increase fluid temperature during cold-weather operation
  3. CTo remove air from the cockpit ventilation system
  4. DTo prevent hydraulic fluid from returning to the reservoir
Show answerCorrect answer: A

A relief valve protects a hydraulic system from excessive pressure by opening a flow path, typically back to a reservoir or return line, when pressure reaches its set point.

Question 5

Why are turbine-engine control cables, linkages, or electrical connections inspected for security and condition?

  1. AA defect could interfere with reliable transmission of a control input or indication
  2. BThey determine the aircraft’s aerodynamic center without affecting operation
  3. CThey prevent all compressor airflow from entering the combustor
  4. DThey replace the need for engine operating limits
Show answerCorrect answer: A

Engine controls and associated connections must transmit commands or signals reliably. A loose, damaged, or improperly adjusted component can lead to incorrect response or indication, so inspection follows approved maintenance procedures.

Question 6

Why is a turbine-engine combustion chamber designed to maintain a stable flame while air continues to flow through it?

  1. ATo keep the compressor from rotating during combustion
  2. BTo allow continuous fuel burning without stopping the airflow
  3. CTo make the turbine operate without hot gases
  4. DTo prevent all pressure loss through the engine
Show answerCorrect answer: B

The combustor must anchor a stable flame in moving air so fuel can burn continuously and supply hot gases to the turbine. Some pressure loss through the combustor is normal.

Question 7

What is the primary purpose of a constant-speed propeller governor?

  1. ATo maintain the selected propeller rpm by adjusting blade angle
  2. BTo maintain a selected manifold pressure by changing fuel flow
  3. CTo prevent compressor stall by adjusting inlet guide vanes
  4. DTo maintain a constant exhaust-gas temperature by changing ignition timing
Show answerCorrect answer: A

A constant-speed governor senses propeller speed and changes blade pitch to oppose rpm changes. The pilot selects the desired rpm, while the governor adjusts blade angle within its operating range.

How to use this practice test

Access is free. A session presents up to 20 random questions from the published FEN practice bank, and results appear after the session. Use missed or uncertain items to pinpoint which system function, indication, or operating relationship needs closer review.

Preparation tips

  • For compressor, turbine, combustion-chamber, and exhaust questions, trace airflow through the engine and connect each component to its function.
  • Review what low oil pressure can indicate and why engine indications should be monitored as thrust is reduced during descent.
  • Compare the roles of hydraulic relief valves, nacelle fire-detection systems, and ram-air turbines; note the condition each is meant to address.
  • Practice distinguishing engine controls and their linkages from propeller-governor functions, including the constant-speed governor’s role.
  • When answering inspection questions, connect damage, contamination, loose connections, or linkage defects to the system function they could affect.
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