A PA30 PLT LOST DIRECTIONAL CTL DURING LNDG RESULTING GOING OFF THE SIDE OF THE RWY AND DAMAGE TO THE WING FLAP WHEN RUNNING OVER A TXWY LIGHT.

Narrative

ACFT WAS CLRED TO LAND RWY 4L; FOLLOWING VISUAL APCH 4L. ATIS RPTED WINDS 130 DEGS AT 11 KTS. TWR ADVISED RPT OF 30 KT WINDSHEAR. FOLLOWING TOUCHDOWN SLIGHTLY L OF CENTERLINE; ACFT VEERED SHARPLY TO L SIDE OF RWY. FULL R AILERON AND R RUDDER/STEERING WERE INEFFECTIVE. ACFT DEPARTED L (W) SIDE OF RWY JUST S OF TXWY Q; THEN CROSSED PAVED ISLAND TO TXWY T; WHERE CTL WAS REGAINED. PATH CROSSED TXWY LIGHTS; ONE OF WHICH IMPACTED LOWER REAR SURFACE OF R FLAP. NO DAMAGE TO TXWY LIGHT OBSERVED. MINOR DAMAGE TO FLAP WAS DISCOVERED FOLLOWING DAY. NO DAMAGE RPT REQUIRED TO BE FILED. FACTORS CONTRIBUTING TO LOSS OF CTL WERE PLT'S FAILURE TO INITIATE TOUCHDOWN ON R/UPWIND SIDE OF RWY; USE OF FULL FLAPS; AND USE OF FULL BACK YOKE TO ESTABLISH AERODYNAMIC BRAKING. PA-30'S ARE WELL KNOWN FOR THEIR TENDENCY TO FLOAT DURING LNDG; DUE TO LOW WING PROFILE. INSTRUCTION EMPHASIZES YOKE BACK PRESSURE AFTER MAIN TOUCHDOWN; TO PROVIDE ENHANCED POSITIVE AERODYNAMIC BRAKING ACTION. IN THIS SIT; THE RESULTING NOSE-HIGH ATTITUDE IMMEDIATELY FOLLOWING MAIN'S TOUCHDOWN ELIMINATED NOSEWHEEL STEERING EFFECT; AT THE SAME TIME THAT RUDDER AERODYNAMIC EFFECT BECAME INEFFECTIVE. WHILE PLT HAD TRAINING AND EXPERIENCE WITH 'MODERATE' CROSS-WIND LNDGS (IE; UP TO 15-20 KTS WITH A HEADWIND ANGLE OF PERHAPS 30 DEGS OFF THE NOSE); PLT HAD NOT EXPERIENCED A NOMINAL 11 KT XWIND AT 90 DEGS (WINDSHEAR RPT SUGGESTS THAT XWIND GUST AT HIGHER THAN 11 KTS MAY HAVE OCCURRED). LNDG SHOULD HAVE BEEN MADE WITH NO FLAPS (RATHER THAN FULL FLAPS) AT A HIGHER SPD. TOUCHDOWN SHOULD HAVE BEEN MADE SUBSTANTIALLY TO THE R OF CENTERLINE; GIVEN THE AVAILABLE 150 FT WIDTH OF RWY 4L. TRAINING EMPHASIS FOR 'NORMAL' LNDGS (CENTERLINE; FULL FLAPS) OVERRODE APPROPRIATE ADJUSTMENTS FOR XWIND LNDG. PLT WILL UNDERTAKE ADDITIONAL DUAL TRAINING IN ADVERSE XWIND CONDITIONS.