Concorde disappears on land 2

Hi,I had addressed this issue previously and managed to fix the problem by replacing the concorde.air file by B737 stock.air file. But stil ocassionally my ARNZ Concorde disappears on land (touch-down). I am copying below the aircraft file, perhaps some adjustment may prevent it from disappearing.Any help would be much appreciated.Thanks [General]performance=For detailed specs visit www.concordesst.com atc_type=CONCORDE atc_model= editable=0 [Views]eyepoint=56.671383, -1.281578, 9.188915 [weight_and_balance]// ACM V2.0max_gross_weight = 407154empty_weight = 172671reference_datum_position = 38.2, 0, 0empty_weight_CG_position = -50.333, 0, 0empty_weight_pitch_MOI = 29000118empty_weight_roll_MOI = 26000118empty_weight_yaw_MOI = 7406663empty_weight_coupled_MOI = 0max_number_of_stations = 9station_load.0 = 0.000000,0.000000,0.000000,0.000000station_load.1 = 3342.000, -29.000, 0.000, 0.000station_load.2 = 300.000, 8.000, 0.000, 0.000station_load.3 = 500.000, -4.000, 0.000, 0.000station_load.4 = 2562.000, -82.000, 0.000, 0.000station_load.5 = 2966.000, 18.000, 0.000, 0.000station_load.6 = 2966.000, 2.000, 0.000, 0.000station_load.7 = 4296.000, -28.000, 0.000, 0.000station_load.8 = 6006.000, -53.000, 0.000, 0.000[lights]//Types: 1=beacon, 2=strobe, 3=navigation, 4=cockpit, 5=landinglight.0 = 3, -84, -42, -6.5, fx_navredhlight.1 = 3, -84, 42, -6.5, fx_navgrehlight.2 = 3, -139.87, 0, 2.14, fx_navwhihlight.3 = 2, -88, -42, -6.5, fx_strobehlight.4 = 2, -88, 42, -6.5, fx_strobehlight.5 = 2, -139.88, 0, 2.76, fx_strobehlight.6 = 1, -26.31, 0, 5.98, fx_beaconhlight.7 = 1, -43.76, 0, -6.77, fx_beaconb[GeneralEngineData]//0=Piston, 1=Jet, 2=None, 3=Helo-Turbine, 4=Rocket, 5=Turbopropengine_type = 1fuel_flow_scalar = 1.000engine.0 = -56.000, -19.250, -1.000engine.1 = -56.000, -15.250, -1.000engine.2 = -56.000, 15.250, -1.000engine.3 = -56.000, 19.250, -1.000min_throttle_limit=-0.469910[effects]dirt = fx_tchdrtconcrete = fx_sparkstouchdown = fx_tchdwn, 1[fuel]//Longitudinal (feet), Lateral (feet), Vertical (feet), Usable(gallons), Unusable (gallons)fuel_type = 2number_of_tank_selectors = 1Center1 = -15.2, 0, 0, 7695, 0Center2 = -110, 0, 4, 3479, 0LeftMain = -52.58, -14.6, -4.5, 10173, 0RightMain = -52.58, 14.6, -4.5, 10173, 0electric_pump=0[contact_points]static_pitch = 1.3static_cg_height = 17max_number_of_points = 7point.0 = 1, 4.7243, 0, -18.6862, 1242.896, 0, 1.9, 40, 0.3, 0.5, 0.8, 6.5, 6.5, 0, 270, 275point.1 = 1, -116.666, 0, -4, 1042.896, 0, 0.6, 0, 0.1, 0.1, 0, 4, 4, 0, 270, 275point.2 = 1, -54.1568, -13, -17.6924, 1587.896, 1, 1.9, 0, 0.8, 2, 1, 9, 9, 2, 270, 275point.3 = 1, -54.1775, 13, -17.6911, 1587.896, 2, 1.9, 0, 0.8, 2, 1, 9.4, 9.4, 3, 270, 275point.4 = 2, -54.167, -42, -7, 1274.433, 0, 0, 0, 0, 0, 0, 0, 0, 5, 0, 0point.5 = 2, -54.167, 42, -7, 1274.433, 0, 0, 0, 0, 0, 0, 0, 0, 6, 0, 0point.6 = 2, -116.667, 0, -4, 1574.803, 0, 0, 0, 0, 0, 0, 0, 0, 9, 0, 0gear_system_type=0[keyboard_response]elevator = 150.000000, 250.000000aileron = 150.000000, 250.000000rudder = 150.000000, 250.000000[forcefeedback]gear_bump_nose_magnitude = 3000gear_bump_nose_direction = 18000gear_bump_nose_duration = 250000gear_bump_left_magnitude = 2700gear_bump_left_direction = 35500gear_bump_left_duration = 250000gear_bump_right_magnitude = 2700gear_bump_right_direction = 00500gear_bump_right_duration = 250000ground_bumps_magnitude1 = 1300ground_bumps_angle1 = 08900ground_bumps_intercept1 = 3.0ground_bumps_slope1 = 0.20ground_bumps_magnitude2 = 200ground_bumps_angle2 = 09100ground_bumps_intercept2 = 1.075ground_bumps_slope2 = 0.035crash_magnitude1 = 10000crash_direction1 = 01000crash_magnitude2 = 10000crash_direction2 = 9000crash_period2 = 75000crash_duration2 = 2500000[airplane_geometry]//ACM_AREAW1// 0,0,0,27.7138,1.4220,1.4220,2.0313,28.3596,2.8447,2.8447//ACM_AREAW2// 4.0626,29.0053,4.2670,4.2670,6.0939,29.6508,5.6894,5.6894,8.1253,30.2966//ACM_AREAW3// 7.1118,7.1118,10.1569,30.9423,8.5340,8.5340,12.1883,31.5881,9.9568,9.9568//ACM_AREAW4// 14.2194,32.2336,11.3788,11.3788,16.2511,32.8795,12.8016,12.8016,18.2824,33.5251//ACM_AREAH1// 0,0,0,0,0,0,0,0,0,0//ACM_AREAH2// 0,0,0,0,0,0,0,0,0,0//ACM_AREAH3// 0,0,0,0,0,0,0,0,0,0//ACM_AREAH4// 0,0,0,0,0,0,0,0,0,0//ACM_AREAV1// 0,0,0,10.5642,1.1734,1.1734,0.2069,9.9259,2.3475,2.3475//ACM_AREAV2// 0.4138,9.2880,3.5213,3.5213,0.6208,8.6498,4.6950,4.6950,0.8277,8.0115//ACM_AREAV3// 5.8688,5.8688,1.0348,7.3734,7.0429,7.0429,1.2417,6.7353,8.2166,8.2166//ACM_AREAV4// 1.4486,6.0970,9.3905,9.3905,1.6555,5.4587,10.5642,10.5642,1.8624,4.8207//ACM_CAREAW1// 6.4008,6.4008,22.9981,28.5410,7.1118,7.1118,24.0139,29.2796,7.8232,7.8232//ACM_CAREAW2// 25.0296,30.0181,8.5340,8.5340,26.0452,30.7567,9.2454,9.2454,27.0610,31.4951//ACM_CAREAW3// 9.9568,9.9568,28.0767,32.2336,10.6680,10.6680,29.0923,32.9724,11.3788,11.3788//ACM_CAREAW4// 30.1081,33.7108,12.0902,12.0902,31.1238,34.4495,12.8016,12.8016,32.1394,35.1879//ACM_CAREAH1// 0,0,0,0,0,0,0,0,0,0//ACM_CAREAH2// 0,0,0,0,0,0,0,0,0,0//ACM_CAREAH3// 0,0,0,0,0,0,0,0,0,0//ACM_CAREAH4// 0,0,0,0,0,0,0,0,0,0//ACM_CAREAV1// 0,0,2.6410,7.9232,1.1734,1.1734,2.8480,7.7076,2.3475,2.3475//ACM_CAREAV2// 3.0550,7.4920,3.5213,3.5213,3.2620,7.2764,4.6950,4.6950,3.4688,7.0608//ACM_CAREAV3// 5.8688,5.8688,3.6758,6.8452,7.0429,7.0429,3.8828,6.6296,8.2166,8.2166//ACM_CAREAV4// 4.0899,6.4140,9.3905,9.3905,4.2968,6.1984,10.5642,10.5642,4.5036,5.9828wing_area = 3926.000wing_span = 84.000wing_root_chord = 90.925wing_dihedral = 3.999wing_incidence = -1.300wing_twist = 1.700oswald_efficiency_factor = 0.832wing_winglets_flag = 0wing_sweep = 55.000wing_pos_apex_lon = 20.840wing_pos_apex_vert = 0.800htail_area = 0.000htail_span = 0.000htail_pos_lon = 0.000htail_pos_vert = 0.000htail_incidence = 0.000htail_sweep = 0.000vtail_area = 365.000vtail_span = 34.660vtail_sweep = 10.000vtail_pos_lon = -125.000vtail_pos_vert = 26.12elevator_area = 344.400aileron_area = 344.400rudder_area = 112.000elevator_up_limit = 19.000elevator_down_limit = 19.000aileron_up_limit = 23.500aileron_down_limit = 23.500rudder_limit = 30.000elevator_trim_limit = 15.000spoiler_limit = 40.000aileron_to_spoileron_gain = 20.000min_ailerons_for_spoilerons = 0.800min_flaps_for_spoilerons = 0.000spoilerons_available = 0[electrical]max_battery_voltage = 24generator_alternator_voltage = 30max_generator_alternator_amps = 70electric_always_available = 0flap_motor = 0, 5, 17gear_motor = 0, 5, 17autopilot = 0, 5, 17avionics_bus = 0, 10, 17avionics = 1, 5, 17pitot_heat = 0, 2, 17additional_system = 0, 20, 17marker_beacon = 1, 2, 17gear_warning = 0, 2, 17fuel_pump = 3, 6, 17starter1 = 3, 20, 17starter2 = 3, 20, 17starter3 = 3, 20, 17starter4 = 3, 20, 17light_nav = 0, 5, 17light_beacon = 0, 5, 17light_landing = 0, 5, 17light_taxi = 0, 5, 17light_strobe = 0, 5, 17light_panel = 0, 5, 17fuel_transfer_pump = 0, 10, 17[jet_engine]thrust_scalar=1.000 [TurbineEngineData]fuel_flow_gain=0.0020 //4.2 feet diameter 26.4?inlet_area=12.400 //RPM for hydraulics and generators-//Air file expects 29920.00 for full power-//Does not affect performance:rated_N2_rpm=29920.000 //Real-world RPM://rated_N2_rpm=8530.000//Thrust does not include reheat configured in air file: static_thrust=30400.000 afterburner_available=1 reverser_available=1 [Reference Speeds]//knots (true) (used by AI and ATC):flaps_up_stall_speed=140.000 full_flaps_stall_speed=110.000 cruise_speed=480.000 max_indicated_speed=380.000000max_mach=0.92[autopilot]autopilot_available=1 flight_director_available=1 default_vertical_speed=1200.000000 autothrottle_available=1 autothrottle_arming_required=1autothrottle_takeoff_ga=1autothrottle_max_rpm=106.000000pitch_takeoff_ga=13.500000 use_no_default_pitch=1use_no_default_bank=1default_pitch_mode=0default_bank_mode=0max_pitch=10.000000max_pitch_acceleration=1.000000max_pitch_velocity_lo_alt=2.000000max_pitch_velocity_hi_alt=1.500000max_pitch_velocity_lo_alt_breakpoint=20000.000000max_pitch_velocity_hi_alt_breakpoint=28000.000000max_bank=25.000000max_bank_acceleration=1.800000max_bank_velocity=3.000000max_throttle_rate=0.100000nav_proportional_control=9.000000nav_integrator_control=0.250000nav_derivative_control=0.000000nav_integrator_boundary=2.500000nav_derivative_boundary=0.000000gs_proportional_control=9.520000gs_integrator_control=0.260000gs_derivative_control=0.000000gs_integrator_boundary=0.700000gs_derivative_boundary=0.000000yaw_damper_gain=0.000000[pitot_static]vertical_speed_time_constant=2[direction_indicators]direction_indicator.0=3,0 [Radios]Audio.1=1 Com.1=1,1 Com.2=1,1 Nav.1=1,0,1 Nav.2=1,0,0 Adf.1=1 Transponder.1=1 Marker.1=1 [Flaps.0]type=1span-outboard=0.125extending-time=25system_type=1damaging-speed=270.000blowout-speed=325.000lift_scalar=1.000drag_scalar=1.000pitch_scalar=1.000flaps-position.0=2.000, 0.000flaps-position.1=5.000, 0.000flaps-position.2=8.000, 0.000[flight_tuning]cruise_lift_scalar=1.000 pitch_stability=1.0 roll_stability=1.0 yaw_stability=1.0 parasite_drag_scalar=1.000 induced_drag_scalar=1.000 elevator_effectiveness=1.000 aileron_effectiveness=1.000 rudder_effectiveness=1.000 pitch_stability=1.0 roll_stability=1.0 yaw_stability=1.0 elevator_trim_effectiveness=1.000 aileron_trim_effectiveness=1.000 rudder_trim_effectiveness=1.000. [brakes]toe_brakes_scale=0.442518parking_brake=1[gear_warning_system]gear_warning_available=0pct_throttle_limit=0.099976flap_limit_power=25.496622flap_limit_idle=5.042029[hydraulic_system]electric_pumps=0engine_map=1,1,1,1normal_pressure=3000.000000[stall_warning]type=1[attitude_indicators]attitude_indicator.0=1[turn_indicators]turn_indicator.0=1,0[ACFU]title=ARNZ AIS CONCORDEsim=concordemodel=panel=sound=checklists=ui_manufacturer=ARNZ AISui_type=Concordeatc_heavy=1visual_damage=0AC_Model=ARNZ_AIS_CONC[FLTSIM.0]title=ARNZ AIS CONCORDE British Airwayssim=concordemodel=panel=sound=checklists=texture=baatc_id=G-BOACatc_flight_number=1ui_manufacturer=ARNZ AISui_type=Concordeui_variation=British Airwaysdescription=AISatc_heavy=1atc_airline=SPEED BIRDatc_parking_codes=BAWatc_parking_types=GATE[FLTSIM.1]title=ARNZ AIS CONCORDE Air Francesim=concordemodel=panel=sound=checklists=texture=afatc_id=F-BTSCatc_flight_number=1ui_manufacturer=ARNZ AISui_type=Concordeui_variation=Air Francedescription=AISatc_heavy=1atc_airline=AIR FRANCEatc_parking_codes=AFRatc_parking_types=GATE