TM 9-2320-386-10 E-3. SIGN GUIDE (Contd) KEY ITEM APPLICABLE MODELS 40 Caution: High intensity noise; hearing protection required when engine is running All 41 No step All 42 Warning: Fan may operate at any time when engine is running All 43 Warning: Keep hands clear All Locations of Vehicle Decals and Data Plates (Contd) 43 40 42 42 41 40 Change 1 E-5