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Exam Review

Key Facts: CASA IREX Exam

100

Practice Questions

OpenExamPrep

40

Official Questions

CASA

70%

Pass Mark

CASA

3.5 hrs

Time Limit

CASA

The CASA Instrument Rating Exam (IREX) is Australia's theory test for IFR privileges. It comprises 40 questions over 3.5 hours, requiring a 70% pass mark. Topics include approach charts, GNSS/ground nav systems, weather minimums, and holding procedures. This prep includes 100 practice questions.

Sample CASA IREX Practice Questions

Try these sample questions to review concepts for the CASA IREX exam. Each question includes a detailed explanation. Start the interactive quiz above for the full 100+ question experience with AI tutoring.

1An aircraft is approaching a holding pattern on a heading of 090°M. The holding pattern has an inbound track of 090°M, right-hand turns. Which sector entry is required?
A.Sector 3 (Direct)
B.Sector 2 (Offset)
C.Sector 1 or 2 optional
D.Sector 1 (Parallel)
Explanation: Approaching on a heading of 090°M to inbound 090°M (outbound 270°M) puts the aircraft in Sector 3 (Direct). Upon crossing the fix, the pilot turns right to follow the holding pattern.
2An aircraft is approaching a holding pattern on a heading of 030°M. The inbound track is 180°M, left-hand turns. Which sector entry is required?
A.Either Sector 1 or 2
B.Sector 3 (Direct)
C.Sector 1 (Parallel)
D.Sector 2 (Offset)
Explanation: Approaching on a heading of 030°M to inbound 180°M with left turns puts the aircraft in the Sector 2 (Offset) entry zone. The pilot must fly outbound on a heading 30° offset from the outbound track.
3What is the maximum angle of interception permitted for a direct entry to an instrument approach reversal procedure track?
A.45 degrees
B.120 degrees
C.90 degrees
D.30 degrees
Explanation: Under AIP ENR 1.5, to enter a reversal procedure directly, the entry track must be within 30 degrees of the outbound track. If outside this limit, a holding pattern entry or maneuver is required.
4During a 2D instrument approach, if visual reference is lost at the MDA before reaching the MAPt, what must the pilot do?
A.Fly to the MAPt before commencing any turns
B.Descend 100 feet to try to re-establish visual contact
C.Immediate turn towards the missed approach path
D.Hold at the current position and request radar vectors
Explanation: If a missed approach is initiated before the MAPt, the pilot must fly the aircraft to the MAPt at or above MDA/DA before turning. This ensures the aircraft remains within protected obstacle clearance areas.
5Calculate the temperature correction to a DA of 400 ft if the aerodrome temperature is -15°C and ISA deviation is -30°C.
A.Add 20 feet
B.Subtract 40 feet
C.No correction required
D.Add 40 feet
Explanation: Cold temperatures cause the altimeter to read higher than the actual altitude. A correction of approximately 4% per 10°C below ISA is applied, which yields about +40 feet to be added to the DA.
6What is the minimum obstacle clearance (MOC) provided in the primary area of an IFR holding pattern in Australia?
A.1000 feet
B.1500 feet
C.500 feet
D.984 feet (300 meters)
Explanation: In Australia, the standard obstacle clearance in the primary area of a holding pattern is 984 feet (300 meters) under PANS-OPS criteria. This provides a safety buffer over all obstacles.
7How should a pilot correct for wind drift on the outbound leg of a holding pattern?
A.Triple the drift correction angle used on the inbound leg
B.Double the drift correction angle used on the inbound leg
C.Apply the same drift correction angle as the inbound leg
D.Fly without correction and adjust on the inbound turn
Explanation: To compensate for wind drift in a holding pattern, the outbound drift correction angle should be three times the correction angle required to track inbound (triple drift correction).
8An aircraft is flying at 150 kt GS and intends to intercept a 12 NM DME arc. If turning at Rate 1 (3 deg/sec), what lead distance should be used?
A.0.4 NM
B.1.6 NM
C.0.8 NM
D.1.2 NM
Explanation: Turn radius = GS / 200 = 150 / 200 = 0.75 NM. For a 90-degree turn onto the arc, a lead distance roughly equal to the turn radius (~0.8 NM) is required to avoid overshooting.
9What is the standard missed approach climb gradient designed into Australian instrument procedures (DAP) unless otherwise specified?
A.2.5%
B.5.0%
C.3.3%
D.2.0%
Explanation: Australian instrument approach procedures are designed based on a standard missed approach climb gradient of 2.5% (approx. 152 ft/NM) starting from the MAPt.
10Under what condition may a pilot descend below MDA or DA during an instrument approach in Australia?
A.Immediately upon receiving a 'clear to land' call from ATC
B.When the GPS displays 'LNAV+V' accuracy
C.When the aircraft is clear of all clouds
D.Only when visual reference is established and can be maintained
Explanation: A pilot may only descend below MDA or DA if the required visual reference has been established and can be maintained, and the aircraft is in a position to land using normal maneuvers.

About the CASA IREX Exam

The CASA Instrument Rating Exam (IREX) is the required theory examination for pilots in Australia seeking an Instrument Rating (IR). The exam tests a candidate's knowledge of Instrument Flight Rules (IFR) procedures, air law and regulations, navigation systems (GNSS, VOR, NDB, ILS), IFR meteorology, and flight planning under IFR.

Exam sponsor: CASA / ASPEQ Exam Delivery. The requirements and fees below concern the certification or admission exam, separate from our free practice resources.

Assessment

Closed-book computer-based exam administered at ASPEQ testing centers. Candidates are permitted to use approved reference publications (AIP, ERSA, DAPs, CAR/CASR).

Time Limit

3.5 hours

Passing Score

70%

Exam / Certification Fees

Approx. $200 - $300 AUD (plus test center provider fees)

Exam sponsor website

Fees, eligibility, and exam policies can change. Confirm them with the exam sponsor before applying or paying.

Our practice resources: topics covered

We aim to reflect publicly available exam outlines and topic information in our study resources. Coverage, format, and difficulty may differ from the actual exam, and we cannot guarantee that every detail is accurate or current. Confirm exam requirements, fees, and policies with the official exam sponsor.

25%

Instrument Approach Procedures

NDB, VOR, ILS, and GNSS approach minimums, missed approach rules, holding patterns, and sector entries

20%

Navigation Aids & Systems

Principles, limitations, and cockpit indications of NDB, VOR, DME, ILS, and GNSS

20%

IFR Air Law & Rules

Part 61, 91, and 135 regulations, altimeter settings, transponder operations, and pilot responsibilities

15%

IFR Meteorology

TAFs, TTFs, GAFs, SIGMETs, icing, turbulence, thunderstorms, and destination alternate requirements

10%

IFR Flight Planning

IFR fuel reserves, alternate aerodrome planning, holding fuel, and route planning

10%

Human Factors & Threat Management

Spatial disorientation, instrument scanning, fatigue, and TEM in IFR environments

Preparing for the CASA IREX Exam

What You Need to Know

  • Passing score: 70%
  • Assessment: Closed-book computer-based exam administered at ASPEQ testing centers. Candidates are permitted to use approved reference publications (AIP, ERSA, DAPs, CAR/CASR).
  • Time limit: 3.5 hours
  • Exam / certification fees: Approx. $200 - $300 AUD (plus test center provider fees) Official sources

Using Our Practice Resources

  • Work through all 100 available questions
  • Review every answer and explanation
  • Track weak areas and revisit them
  • Use our AI tutor for tough concepts

CASA IREX: Suggested Study Strategy

1Master alternate requirements — memorize fuel and weather alternate rules from AIP ENR
2Learn how to quickly calculate holding pattern entries (Direct, Parallel, and Teardrop) based on your inbound track
3Pay close attention to instrument approach chart minimums, particularly temperature corrections and PEC corrections

Frequently Asked Questions

What is the passing score for the IREX exam?

The passing score is 70% or higher.

What publications are allowed in the exam?

Candidates are allowed to bring physical copies of AIP, ERSA, DAPs, CAR 1988, CASR 1998, and Part 91/135 MOS. Sticky notes and highlights are allowed, but no handwritten notes.