Pilot of small aircraft hd near midair collision with medium large transport on approach to isp in r...

Attributes
ACN	118147
Time
Date	198907
Day	Thu
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : isp
State Reference	NY
Altitude	agl bound lower : 400 agl bound upper : 600
Environment
Flight Conditions	Marginal
Light	Daylight
Aircraft 1
Controlling Facilities	tower : isp artcc : zla
Operator	common carrier : air carrier
Make Model Name	Medium Large Transport, Low Wing, 2 Turbojet Eng
Flight Phase	descent : approach descent other
Flight Plan	IFR
Aircraft 2
Operator	general aviation : personal
Make Model Name	Small Aircraft, High Wing, 1 Eng, Fixed Gear
Flight Phase	descent : approach descent other
Route In Use	approach : visual
Flight Plan	None
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 160 flight time total : 10000
ASRS Report	118147
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : atp
Events
Anomaly	non adherence : clearance
Independent Detector	other flight crewa
Resolutory Action	flight crew : took evasive action
Consequence	Other
Miss Distance	horizontal : 0 vertical : 200
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

While on ILS final to 24 at isp (offset localizer) a traffic advisory of a light aircraft at 1 O'clock on right downwind, no factor, was issued by tower. The aircraft B was instructed to look for my aircraft a and to turn final behind us. At approximately 600' my copilot sighted the light aircraft above us to our right, descending on an intercept heading facing away from us (apparently on final approach). Because the localizer to runway 24 is offset, I believe we were able to see the light aircraft soon enough. WX at the time was partially obscured, 4000' scattered, visibility 2-3 mi. Evasive action was to duck under the G/south and fly level to reintercept at about 300-400' acl. It wasn't necessary to turn and we passed underneath by about 200'. We landed normally after reintercepting the G/south. The other pilot told tower that he thought we had passed him, so he turned on final. Visibility was a major contributing factor to this incident. A sharp-eyed copilot and an offset localizer gave me enough time and room to take mild evasive action to avoid a collision.

Original NASA ASRS Text

Title: PLT OF SMA HD NMAC WITH MLG ON APCH TO ISP IN REDUCED VISIBILITY.

Narrative: WHILE ON ILS FINAL TO 24 AT ISP (OFFSET LOC) A TFC ADVISORY OF A LIGHT ACFT AT 1 O'CLOCK ON RIGHT DOWNWIND, NO FACTOR, WAS ISSUED BY TWR. THE ACFT B WAS INSTRUCTED TO LOOK FOR MY ACFT A AND TO TURN FINAL BEHIND US. AT APPROX 600' MY COPLT SIGHTED THE LIGHT ACFT ABOVE US TO OUR RIGHT, DSNDING ON AN INTERCEPT HDG FACING AWAY FROM US (APPARENTLY ON FINAL APCH). BECAUSE THE LOC TO RWY 24 IS OFFSET, I BELIEVE WE WERE ABLE TO SEE THE LIGHT ACFT SOON ENOUGH. WX AT THE TIME WAS PARTIALLY OBSCURED, 4000' SCATTERED, VISIBILITY 2-3 MI. EVASIVE ACTION WAS TO DUCK UNDER THE G/S AND FLY LEVEL TO REINTERCEPT AT ABOUT 300-400' ACL. IT WASN'T NECESSARY TO TURN AND WE PASSED UNDERNEATH BY ABOUT 200'. WE LANDED NORMALLY AFTER REINTERCEPTING THE G/S. THE OTHER PLT TOLD TWR THAT HE THOUGHT WE HAD PASSED HIM, SO HE TURNED ON FINAL. VISIBILITY WAS A MAJOR CONTRIBUTING FACTOR TO THIS INCIDENT. A SHARP-EYED COPLT AND AN OFFSET LOC GAVE ME ENOUGH TIME AND ROOM TO TAKE MILD EVASIVE ACTION TO AVOID A COLLISION.

Data retrieved from NASA's ASRS site as of August 2007 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.

Pilot of small aircraft hd near midair collision with medium large transport on approach to isp in reduced visibility.