What was found
ON FINAL APPROACH AT 170K THE GEAR HANDLE WAS PUT DOWN, BUT JUST THE 3 RED LTS CAME ON AFTER 20 SEC THE GEAR HANDLE STARTED TO FLASH. THE GEAR WAS EXTENDED USING THE EMER GEAR PULL HANDLE. 3 GREEN CAME ON. - REMOVED L/H MLG DOOR PROX SWITCH, P/N 803682, S/N 0790. NEW PROX SWITCH P/N 803682, S/N 1256. REMOVED RT MLG DOOR PROX SWITCH, P/N 803682, 0956, & INSTALLED NEW SWITCH, P/N 803682, S/N 1225. PERFORMED FUNCTIONAL EXTENSION / RETRACTION TEST OF LANDING GEARS + DOORS, FUCTIONAL CHECK GOOD WITH NO DEFECTS NOTED. DONE IAW F-200 MM CHAP 07-100, 52-300 & 32-311. DETAILS REF FAS05-102.