This Airman Knowledge Testing Supplement is designed by the Federal Aviation Administration (FAA) Flight Standards Service. It is intended for use by Airman Knowledge Testing (AKT) Organization Designation Authorization (ODA) Holders and other entities approved and/or authorized to administer airman knowledge tests on behalf of the FAA in the following knowledge areas: Airline Transport Pilot (FAR 121) Multiengine Airplane (ATM) ; Airline Transport Pilot (FAR 135) Single-Engine Airplane (ATS) ; Airline Transport Pilot (FAR 135) Added Rating?Airplane (ARA) ; Airline Transport Pilot (FAR 135) Helicopter (ATH) ; Airline Transport Pilot (FAR 135) Added Rating?Helicopter (ARH) ; Airline Transport Pilot Multiengine Airplane Canadian Conversion (ACM) ; Airline Transport Pilot Single-Engine Airplane Canadian Conversion (ASC) ; Airline Transport Pilot Helicopter Canadian Conversion (ACH) ; Aircraft Dispatcher (ADX) ; Flight Navigator (FNX)