CASA IREX case studies
CASA IREX · Put your knowledge to work in context.
The CASA Instrument Rating Examination (IREX) is the written knowledge test that CASA sets for pilots seeking an instrument rating in Australia. It is aimed at pilots who already hold a licence and want the privileges that let them fly under the instrument flight rules - in cloud, at night under IMC, and on instrument approach procedures. The CASA IREX case studies are 5 cases and about 2,733 words.
1Depressurization Over the Rockies: Drift-Down or Emergency Descent?
You are the pilot flying a pressurized twin turboprop at FL250 on an IFR clearance from Calgary to Kelowna. Ten minutes after top of climb, the cabin altitude warning activates and the cabin climbs through 10,000 ft at roughly 1,500 ft/min.
560 words, about 3 min2Icing on the Approach: Continuing or Diverting at Minimum Fuel
You are inbound on an ILS to Runway 27 at a mountain-adjacent airport. ATIS reports wind 260/12, visibility 1 1/2 SM in light freezing drizzle, ceiling 400 ft overcast, temperature -2°C, dewpoint -3°C.
533 words, about 3 min3GPS Approach with a RAIM Prediction Problem
You are planning an RNAV (GPS) approach to Runway 14 at a remote airport. The approach requires WAAS or, if WAAS is unavailable, RAIM with a prediction of at least five minutes before the final approach fix.
497 words, about 2 min4Weight and Balance After a Late Load Change
You are captain of a twin-engine turboprop with a maximum takeoff weight of 12,500 lb and a maximum landing weight of 12,000 lb. Basic empty weight is 8,200 lb at an empty-weight arm of 180 inches.
591 words, about 3 min5Alternate Planning When the Destination Forecast Is Marginal
You are planning a 2-hour IFR flight to an airport with one ILS approach to Runway 09 and a circling approach to Runway 27. The TAF for your arrival window reads: wind 090/08, visibility 4 SM, ceiling 1,500 ft broken, temporarily 2 SM and 800 ft.
552 words, about 3 min