CASA IREX study plan
CASA IREX · Give each week a clear focus.
8 weeks · About 6 hours per week
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
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
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
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
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
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
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
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