51Fxx 51Sxx 51Txx
Electro-magnetic instruments (KP = 43.0) T, AO, AE, CA, MF 52T0x microwave 52T01 microwave 52MFX MF microwave 52CA1 CA microwave 52AO AE aerodist 52T5x microwave 52T4x microwave 52T3x microwave 52T2x microwave 52T1x microwave Electro-optical instruments (KP = 38.0) ME, DI, HP, G, MA, RM, R, TP, SK, CI, TC, PE, NI 52Gxy visible light 52DI visible light 52MA1 visible light 52MEK visible light 52HPx HP visible light 52RxA visible light 52RMx visible light 52CI visible light 52NI visible light 52PE visible light 52SK visible light 52TC visible light 52TP visible light Non electronic methods (KP = 24.0) BL, AU, ST, TI, TL, _SB, _TL 52BLW baseline 52BLS baseline 52TL _TL miscellaneous 52 SB miscellaneous 52AUT miscellaneous 52STA miscellaneous All others (KP = 24.0)
53 yr 53POL 53SUN 53AZI