TM 10-3930-669-20 VISUAL INSPECTION (1) Start engine (TM 10-3930-669-10). (2) Listen for roughness or missing. (3) If    engine    misses    or    runs    rough replace injectors (Para 4-2). (4) Shut down engine. VISUAL INSPECTION Check air cleaner filter assembly (Para 4- 4). (a) If air cleaner filter assembly is dirty, replace filter (Para 4-4). (b) If air cleaner filter assembly is not dirty, notify DS Maintenance. 2-79