BEECHCRAFT BONANZA S35 PLT PERFORMS A GEAR-UP LNDG ON RWY 36 AT SPG.

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COMPLETED INITIAL GUMP CHK BEFORE TURNING BASE LEG; COMBINATION OF VERY BRIGHT SUNLIGHT AND SUN GLASSES MADE VISIBILITY OF LNDG GEAR POS LIGHTS AND MECHANICAL FLAG POOR. ADDED APCH FLAPS (APPROX 10 DEGS DOWN) AND ADJUSTED PWR TO MAINTAIN 800 FT ALT. ADDED FULL FLAPS UPON TURNING FINAL AND ADJUSTED PWR TO MAINTAIN PAPI GS. PLT MADE FINAL GUMP CHK; TOUCHING MIXTURE; PROP AND LNDG GEAR SELECTOR WITH R HAND; LOOKED AT GEAR POS INDICATORS BUT; EXPECTING THAT GEAR EXTENDED AFTER SELECTING GEAR DOWN; DID NOT NOTICE THE FAULT INDICATIONS WHEN MOMENTARILY LOOKING FROM THE BRIGHT EXTERIOR ENVIRONMENT TO THE COCKPIT INTERIOR. OVER THE SEAWALL AT APPROX 30 FT; INITIATED FLARE AND REDUCED THROTTLE TO IDLE. PLT DID NOT RECOGNIZE THAT THE WARNING HORN THAT SOUNDED WAS THE GEAR UP WARNING SIGNAL SINCE HIS EXPECTATION WAS THAT THE WHEELS WERE DOWN. HE ASSUMED THAT THE SOUND HEARD THROUGH HIS NOISE CANCELING HEADSET WAS THE STALL WARNING HORN AND EASED THE NOSE DOWN A BIT UNTIL COMPLETING THE LNDG WITH NOISY AND EXPENSIVE RESULTS. THE APPARENT DAMAGE TO THE AIRPLANE WAS THE PROP; THE NOSEWHEEL DOORS; THE INNER DOORS OF THE MAIN LNDG GEAR; THE EXHAUST PIPES AND 1 SMALL ANTENNA ON THE BELLY. THE PARTIALLY EXTENDED MAIN LNDG GEAR PROTECTED THE FLAPS AND OTHER ELEMENTS ON THE BOTTOM OF THE ACFT.