The Inspection Authorization test (test code IAR) has a pass mark like any FAA test, but a stricter retest rule than most. Here are both, from the FAA's testing matrix.
70% passes. On the 50-question IAR test, that's 35 right.
The IAR test is 50 questions in 3 hours, given only at testing centers authorized for it, and the matrix lists a minimum age of 21. To take it you bring FAA Form 8610-1 with an FAA inspector's endorsement.
Checked October 24, 2026 against the official sources listed at the bottom of this page.
Take the free IA practice test50 questions at the real pass mark, no sign-upFrom the testing matrix: you must wait at least 90 days after the failure, then go back to your FAA office for a new endorsed Form 8610-1. Bring the failed AKTR and the new 8610-1 to the testing center. An expired test report doesn't count as retest authorization for the IAR.
Among other things, you need a mechanic certificate with airframe and powerplant ratings that have been in effect for at least 3 years, and 2 years of active maintenance work before you apply (14 CFR 65.91).
70%. The Inspection Authorization (IAR) test is 50 questions in 3 hours, so 35 correct passes.
At least 90 days after the failure, and you need a new FAA Form 8610-1 endorsed by your FAA office.
Only at testing centers authorized to give the IAR test.