Airworthy PrepCommercial Pilot Airplane test code
CA.IX.C.K1bEmergency Operations: Systems and Equipment Malfunctions
Commercial Pilot Airplane test standard, area of operation IX, task C
Written as ca.ix.c.k1b or CA.IX.C.K1b on your score report.
The FAA's wording
Causes of partial or complete power loss related to the specific type of powerplant(s).
[Archived].
What it means
CA.IX.C.K1b is a knowledge element in the Emergency Operations area of operation of the Commercial Pilot Airplane test standard. A knowledge element is something the FAA expects you to know, and the written test asks questions on it.
- CA
- Commercial Pilot Airplane ACS
- IX
- Area of operation IX: Emergency Operations
- C
- Task C: Systems and Equipment Malfunctions
- K1b
- Part (b) of knowledge element 1
Seeing it on your score report
Your Airman Knowledge Test Report lists a code for each area where you missed a question. Seeing CA.IX.C.K1b there means at least one of your wrong answers was on this element. If you are taking the practical test next, expect the examiner to ask about it. Retaking the written? Start with this code and the others on your report.
Sources: FAA-S-ACS-7B, Commercial Pilot for Airplane Category ACS (November 2023, effective May 31, 2024); FAA Airman Knowledge Testing Matrix (revised 9/25/26), p. 2.
Can be printed on 2 tests
- Commercial Pilot Airplane (CAX)
- Commercial Pilot Airplane Canadian Conversion (CCP)
Got more than one code on your report?
Paste them all into the free study planner and it groups them by subject, most missed first.