Narrative:

XA15 local time after 2 1/2 hours of flight; air carrier X contact tower report 10 mi out; while preparing to land; after having energized gear pump; a partial panel power loss was encountered; all communication; G-530; transponder; HSI; pwred down. Nearing 2 mi out and not able to report/communicate; I elected a 180 degree course reversal; while flying north for approximately 5 mins I attempted to communication with ZZZ using my handheld; then while flying west; I determined to use cell phone as 'last resort;' tower-confirmed location; and cleared me to land runway 28L. I flew a standard approach; verified the float 'whip' indicator to confirm gear down but; upon touchdown the main gear held; but both the nose gear slowly retracted/collapsed -- minor material of the keels in the front 1/3 (2 ft area) of each pontoon were ground down during a 400 ft rollout. We towed aircraft to electrical shop for service; no injuries and no material damage to aircraft. With more than 50% of the keels intact; no repair or replacement will be required. The local FAA representative (FAA-FSDO) met with me. He confirmed a collapse of front gear; and requested that our shop keep him posted of their finding as to the electrical system outage. He stated that he was not aware of a gear pump and communication/navigation electrical link; and at this time no one seems to know how the electrical components could be interrelated.

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Original NASA ASRS Text

Title: A C206 EQUIPPED WITH PONTOONS EXPERIENCED ELECTRICAL PWR FAILURE THAT FAILED THE NOSE GEAR. LANDED WITH MINIMUM DAMAGE TO PONTOON KEELS.

Narrative: XA15 LCL TIME AFTER 2 1/2 HRS OF FLT; ACR X CONTACT TWR RPT 10 MI OUT; WHILE PREPARING TO LAND; AFTER HAVING ENERGIZED GEAR PUMP; A PARTIAL PANEL PWR LOSS WAS ENCOUNTERED; ALL COM; G-530; XPONDER; HSI; PWRED DOWN. NEARING 2 MI OUT AND NOT ABLE TO RPT/COMMUNICATE; I ELECTED A 180 DEG COURSE REVERSAL; WHILE FLYING N FOR APPROX 5 MINS I ATTEMPTED TO COM WITH ZZZ USING MY HANDHELD; THEN WHILE FLYING W; I DETERMINED TO USE CELL PHONE AS 'LAST RESORT;' TWR-CONFIRMED LOCATION; AND CLRED ME TO LAND RWY 28L. I FLEW A STANDARD APCH; VERIFIED THE FLOAT 'WHIP' INDICATOR TO CONFIRM GEAR DOWN BUT; UPON TOUCHDOWN THE MAIN GEAR HELD; BUT BOTH THE NOSE GEAR SLOWLY RETRACTED/COLLAPSED -- MINOR MATERIAL OF THE KEELS IN THE FRONT 1/3 (2 FT AREA) OF EACH PONTOON WERE GROUND DOWN DURING A 400 FT ROLLOUT. WE TOWED ACFT TO ELECTRICAL SHOP FOR SVC; NO INJURIES AND NO MATERIAL DAMAGE TO ACFT. WITH MORE THAN 50% OF THE KEELS INTACT; NO REPAIR OR REPLACEMENT WILL BE REQUIRED. THE LCL FAA REPRESENTATIVE (FAA-FSDO) MET WITH ME. HE CONFIRMED A COLLAPSE OF FRONT GEAR; AND REQUESTED THAT OUR SHOP KEEP HIM POSTED OF THEIR FINDING AS TO THE ELECTRICAL SYS OUTAGE. HE STATED THAT HE WAS NOT AWARE OF A GEAR PUMP AND COM/NAV ELECTRICAL LINK; AND AT THIS TIME NO ONE SEEMS TO KNOW HOW THE ELECTRICAL COMPONENTS COULD BE INTERRELATED.

Data retrieved from NASA's ASRS site as of January 2009 and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.