GEAR UP LNDG IN AMPHIBIAN WHEN ACFT EXPERIENCES EQUIP MALFUNCTION.

Narrative

LNDG AN AMPHIBIAN SEAPLANE; ON THE APCH SELECTED GEAR 2 MI OUT. CONTINUED WITH GUMP CHK; LIGHT INDICATED GEAR PUMP RUNNING. ABOUT 1/4 MI OUT DOUBLE CHKED INDICATOR LIGHTS. SUN WAS SHINING IN ON INST PANEL. ALL 8 LIGHTS APPEARED TO BE SAME INTENSITY. PUMP LIGHT OFF. SLIGHT TURB SITUATION. UPON TOUCHDOWN; REALIZING THERE WAS A PROBLEM WITH THE GEAR; APPLIED 40 DEG FLAPS TO HOLD AS MUCH WT OFF FLOATS AS POSSIBLE. APPLIED ENOUGH PWR TO MAINTAIN DIRECTIONAL CTL UNTIL THE ACFT STOPPED. UPON EXAMINATION OF PROBLEM FOUND PRESSURE SWITCH ON LNDG GEAR PUMP HAD MALFUNCTIONED AND SHUT DOWN BEFORE EXTENDING ALL GEAR. NO DAMAGE WAS DONE TO ACFT AND NO INJURIES TO PAXS. PLANE LANDED ON FLOAT WEAR STRIPS. THERE IS NO ALARM SYS CONNECTED WITH THIS LNDG SYS. THE ONLY WAY TO CHK GEAR POS IS BY GEAR SELECTOR ARM IN CORRECT POS; (4) INDICATOR LIGHTS (BLUE UP; GREEN DOWN); AND BY PHYSICALLY LOOKING OUTSIDE PLANE THROUGH INSPECTION HOLE IN TOP OF FLOAT. FROM THE PLT SEAT; THIS IS ONLY POSSIBLE TO SEE ON L FLOAT.