Upon completion of your FAA Knowledge Test, the testing center will issue a printed Airman Knowledge Test Report (AKTR). The AKTR includes your test score and lists a code for any questions answered incorrectly. Retain your original AKTR. Airman Knowledge Test Reports are valid for 24 calendar months. If the AKTR expires before completion of the practical test, you must retake the knowledge test.
There are two different kinds of codes you may see on your AKTR—ACS codes and LSC codes. While the codes look different, they both serve the same purpose: to identify the specific knowledge areas from the FAA testing standards.
Some certificates and ratings have a corresponding Airman Certification Standards publication that sets the standards for what is tested. For these tests, you will see ACS codes on your AKTR that identify the knowledge areas of the questions you missed. ACS codes look similar to this: PA.IV.G.K2. Refer to the Airman Certification Standards page on the FAA website for all the ACS codes relevant to your certificate or rating.
If your certificate or rating does not have a corresponding Airman Certification Standards, then the standards are set forth in a Practical Test Standards publication, and you will see Learning Statement Codes on your AKTR. LSC codes look similar to this: PLT248. Refer to the FAA Learning Statement Reference Guide for all the LSC codes.
Study these knowledge areas to improve your understanding of the subject matter. Your instructor is required to provide instruction on each of the knowledge areas listed on your AKTR and to complete an endorsement of this instruction. You must present this to the examiner prior to taking the practical test. During the oral portion of the practical test, the examiner is required to evaluate the noted areas of deficiency.