CASA IREX study materials
CASA IREX study resources

CASA IREX study plan

CASA IREX · Give each week a clear focus.

8 weeks · About 6 hours per week

Week 1

Instrument flight rules and procedures

  • Map every IFR clearance element (route, altitude, hold, departure/arrival instructions) to the regulation or AIM guidance that authorizes it, writing one line of justification per element

  • Reconstruct the standard instrument departure and arrival symbology from memory on a blank sheet, then check it against a reference chart legend and correct errors

  • Explain the difference between a cleared altitude, a minimum IFR altitude, and an emergency safe altitude using three worked numeric examples

  • Draft a one-page decision flow for accepting, amending, or rejecting an ATC clearance that conflicts with terrain or performance limits

Your checkpoint

A one-page annotated clearance template with each element labeled and sourced, plus a scored 20-question self-quiz at 80% or better

Week 2

Instrument flight rules and procedures

  • Solve six holding-pattern entry problems (direct, parallel, teardrop) from arbitrary inbound courses and wind conditions, showing the wind-correction angle calculation

  • Compute required leg timing and outbound headings for holding at three different altitudes and true airspeeds, applying the standard wind drift correction rule

  • Sequence the actions and callouts for a missed approach from the final approach fix through the holding fix, including the climb-gradient check

  • Compare precision and non-precision approach minima, identifying the visual descent point, decision altitude, and missed approach point on three representative procedure descriptions

Your checkpoint

A worked problem set of ten holding entries and three missed-approach sequences, all correct after self-grading, with a written error log

Week 3

Instrument flight rules and procedures & Navigation and radio navigation aids

  • Trace the signal path and failure modes of VOR, DME, ILS, and GNSS, listing one operational consequence of each failure mode

  • Interpret a station declination, magnetic variation, and bearing pointer reading together to determine aircraft position without GPS

  • Calculate and apply the ILS localizer and glideslope sensitivity changes with distance from the threshold

  • Identify the conditions under which RAIM prediction is required and describe the action to take when RAIM is unavailable

Your checkpoint

A two-page radio-navigation aid comparison sheet covering signal, accuracy, failure mode, and cockpit indication for five aids, plus ten solved position-fixing problems

Week 4

Meteorology for instrument flight

  • Decode a METAR and TAF line by line, converting every group into plain-language meaning and flagging the groups that affect approach minimums

  • Interpret freezing-level, icing, and turbulence forecasts to justify a go/no-go decision for a specific planned departure time

  • Explain how a frontal system and its associated pressure pattern change wind and visibility at a destination over a six-hour window

  • Derive the crosswind and headwind components for three runway/threshold combinations from a reported wind, applying gust factors

Your checkpoint

A written weather brief for a hypothetical 300-nautical-mile IFR flight, including a go/no-go recommendation with three supporting forecast citations

Week 5

Meteorology for instrument flight & Flight planning, performance and loading

  • Compute density altitude and its effect on takeoff and climb performance for three field elevations and temperature combinations

  • Apply the alternate-airport minimums rule and weather requirements to decide whether an alternate is required and which one qualifies

  • Build a fuel plan that accounts for taxi, trip, contingency, alternate, and final reserve, showing each line item

  • Identify the hazards of structural icing and the escape options available when climb and descent are both constrained

Your checkpoint

A complete flight-planning worksheet for one hypothetical flight, with density altitude, fuel, alternate selection, and performance numbers all computed and cross-checked

Week 6

Navigation and radio navigation aids & Flight planning, performance and loading

  • Plot a route on a chart using dead reckoning, computing true course, wind correction angle, ground speed, and estimated time en route for each leg

  • Compute weight and balance for a load scenario, then determine how much payload must be offloaded to stay within the forward and aft center-of-gravity limits

  • Verify that a planned route meets minimum en-route and obstacle-clearance altitudes, adjusting the altitude where it does not

  • Reconcile a flight plan's time, fuel, and distance figures against a recalculated leg-by-leg table and explain any discrepancy

Your checkpoint

A leg-by-leg navigation and weight-and-balance package for a three-leg flight, with all computations shown and every limit verified

Week 7

Instrument flight rules and procedures & Meteorology for instrument flight & Navigation and radio navigation aids & Flight planning, performance and loading

  • Complete a timed 60-question mixed-domain practice exam under exam conditions and record per-domain scores

  • Diagnose the two weakest domains from the practice exam and write a targeted remediation list of specific knowledge gaps

  • Re-teach each missed concept aloud or in writing without notes, confirming retention before moving on

  • Recompute the five most error-prone calculations from memory to verify the method is stable under time pressure

Your checkpoint

A scored practice exam with a per-domain breakdown and a written remediation plan naming each gap and the action to close it

Week 8

Instrument flight rules and procedures & Meteorology for instrument flight & Navigation and radio navigation aids & Flight planning, performance and loading

  • Retake a full-length timed practice exam and compare per-domain scores against week 7 to confirm improvement

  • Close every remaining remediation item and document the resolution for each

  • Rehearse the workflow for a complete IFR flight from weather brief through alternate selection and fuel planning, start to finish, without reference material

  • Review the personal error log and restate the three most frequent mistake patterns with a prevention rule for each

Your checkpoint

A final practice exam at or above the target passing score in every domain, plus a one-page consolidated review sheet of formulas, rules, and personal error patterns

Milestones

Week 2: Can solve a holding entry and a missed-approach sequence correctly, unaided, in under five minutes each

Week 4: Can produce a defensible go/no-go weather brief with cited forecast reasoning in under 20 minutes

Week 6: Can complete a full flight plan, including fuel, weight and balance, and altitude verification, with no arithmetic errors

Week 7: Practice exam score recorded per domain; every domain at or above 70% with a written remediation plan in place

Week 8: Full-length practice exam at or above the target passing score in all four domains, with the error log fully resolved