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FAA Ground Instructor Instrument Knowledge Test Practice Test

The IGI knowledge test addresses the instrument-flight knowledge a ground instructor must explain to pilots. Practice-bank questions sample aviation weather products and reports, IFR clearances and departure procedures, pitot-static instruments, magnetic variation, stabilized approaches, and transponder altitude reporting.

Exam overview

Exam providerFederal Aviation Administration
Exam codeIGI
CategoryAviation

About the FAA Ground Instructor Instrument Knowledge Test Exam

Preparing to teach these subjects means connecting definitions to operational decisions. Weather questions involve distinguishing broad-area hazard forecasts from observations and understanding how pilot reports add firsthand conditions. IFR procedure questions call for interpreting clearance timing, including clearance void times and expect-further-clearance times, and explaining the purpose of obstacle departure procedures. Instrument-system questions involve the static source, pressure altitude encoding, and how those systems support flight displays or transponder reporting. Other sampled concepts include magnetic variation and the role of a stabilized approach in managing instrument operations. For ground instruction, practice explaining what a term or instrument function means, how it affects a pilot’s next action, and where misunderstanding could affect safe IFR planning or execution.

Sample Practice Questions

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

Question 1

Which weather product is designed to provide a concise overview of observed and forecast weather hazards relevant to aviation over a broad area?

  1. AAviation Area Forecast discussion or comparable area-focused aviation weather briefing product
  2. BA runway-incursion report
  3. CA standard instrument departure chart
  4. DAn airport diagram
Show answerCorrect answer: A

Area-focused aviation weather products and briefings summarize conditions and hazards across a region, supporting route and flight-planning decisions. Charts for departures and airport movement provide procedural or ground-layout information, not regional weather forecasts.

Question 2

What is the primary purpose of a clearance void time in an IFR clearance?

  1. AIt sets the latest time an aircraft may take off under that clearance without further coordination
  2. BIt sets the time at which the aircraft must begin its descent
  3. CIt indicates when the filed flight plan automatically becomes active
  4. DIt specifies when the pilot must contact the destination tower
Show answerCorrect answer: A

A clearance void time limits how long a pilot may depart using the clearance. If the aircraft has not departed by that time, the pilot must follow the applicable instructions, including notifying ATC if required, rather than departing on the expired clearance.

Question 3

What does a PIREP contribute to aviation weather information?

  1. AAn observation of actual weather conditions reported by a pilot in flight
  2. BA forecast of expected winds at multiple flight levels
  3. CA scheduled observation made automatically at an airport
  4. DA notice that an instrument procedure has been changed
Show answerCorrect answer: A

A pilot report (PIREP) conveys weather or flight conditions actually encountered, such as turbulence, icing, or cloud tops. These reports help other pilots and forecasters assess conditions not fully captured by routine observations.

Question 4

What is the practical significance of a published obstacle departure procedure (ODP)?

  1. AIt provides a departure path intended to help aircraft avoid obstacles, and pilots should consider it when departing under instrument conditions
  2. BIt authorizes a pilot to ignore an assigned departure runway
  3. CIt guarantees that ATC will provide terrain separation after takeoff
  4. DIt specifies the aircraft's required destination alternate
Show answerCorrect answer: A

An ODP is designed to provide obstacle clearance during departure, often through specified routing or climb requirements. Pilots must follow applicable clearances and aircraft limitations; an ODP does not guarantee ATC terrain separation in every circumstance.

Question 5

A pilot receives an ATC clearance containing the phrase “expect further clearance” followed by a time. What does that time indicate?

  1. AThe time at which the pilot can expect ATC to issue a further clearance, not authorization to proceed beyond the current clearance
  2. BThe time the aircraft is required to start its descent
  3. CThe time at which the current clearance automatically expires
  4. DThe time by which the pilot must report established on the localizer
Show answerCorrect answer: A

An expect-further-clearance time advises when ATC anticipates issuing another clearance, commonly in clearance-delivery or holding situations. It is not itself an authorization to proceed beyond the clearance already received.

Question 6

What is the main function of a static port in a pitot-static system?

  1. ATo sense total pressure from the aircraft's forward motion
  2. BTo sense ambient atmospheric pressure for instruments such as the altimeter and vertical speed indicator
  3. CTo measure outside-air temperature for the airspeed indicator
  4. DTo supply pressure only to the engine manifold pressure gauge
Show answerCorrect answer: B

A static port senses ambient atmospheric pressure. That pressure is supplied to the altimeter and vertical speed indicator and is compared with pitot pressure by the airspeed indicator.

Question 7

What does the term magnetic variation describe?

  1. AThe difference between true north and magnetic north at a particular location
  2. BThe difference between an aircraft compass heading and its gyro heading caused by acceleration
  3. CThe error caused by nearby electrical equipment in an aircraft
  4. DThe angle between an aircraft's longitudinal axis and its flight path
Show answerCorrect answer: A

Magnetic variation is the angular difference between true north and magnetic north, and it varies by geographic location. It is distinct from aircraft-specific compass deviation.

How to use this practice test

The free US Practice Tests practice bank contains 50 questions. Each session presents up to 20 random questions and shows results afterward. Use the results to identify missed concepts, then practice explaining the underlying weather, clearance, procedure, or instrument-system idea in your own words.

Preparation tips

  • For weather items, compare the purpose of hazard outlooks, aviation observations, and PIREPs; explain what each contributes to a pilot’s picture of conditions.
  • Make a short reference list for IFR clearance timing terms, including clearance void time and expect-further-clearance time, and state the operational meaning of each.
  • Trace pitot-static and transponder altitude information from source to use: distinguish the static port’s role from the pressure altitude encoder’s output.
  • Practice explaining how magnetic variation affects direction references and why a stabilized approach supports controlled instrument-flight execution.
  • For each missed practice question, formulate a brief instructor-style explanation linking the concept to a pilot decision or system function.
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