Airborne conflict between small transport X and military helicopter Y at 1b1.

Attributes
ACN	160727
Time
Date	199010
Day	Mon
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : 1b1
State Reference	NY
Altitude	agl bound lower : 300 agl bound upper : 300
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Operator	common carrier : air taxi
Make Model Name	Small Transport, Low Wing, 2 Recip Eng
Flight Phase	descent : approach landing other
Flight Plan	None
Aircraft 2
Operator	other
Make Model Name	Helicopter
Flight Phase	cruise other other
Person 1
Affiliation	company : air taxi
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 180 flight time total : 2100 flight time type : 90
ASRS Report	160972
Person 2
Affiliation	company : air taxi
Function	flight crew : first officer
Qualification	pilot : instrument pilot : commercial
Events
Anomaly	conflict : airborne less severe other spatial deviation
Independent Detector	other flight crewa
Resolutory Action	none taken : anomaly accepted
Consequence	Other
Miss Distance	horizontal : 500 vertical : 300
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

While approaching the airport for a straight in to runway 21, we noticed an helicopter maneuvering west of the airport. I noticed that we were descending (my copilot was occupying the left seat and flying). As is custom, I assumed that the mlt helicopter Y would be landing on the parallel taxiway. When maneuvering for landing, I noted that the helicopter Y positioned himself above our altitude in line with runway 21. As full flaps had been selected, my copilot proceeded with the landing, under the helicopter Y. Though we were announcing our position on unicom, we did not know the mlt helicopter Y only was equipped with UHF communication. If he had VHF, no problem would have occurred. We should have flown a full pattern, but after 8 1/2 day, we were tired. I should have provided crew guidance in initiating a go around.

Original NASA ASRS Text

Title: AIRBORNE CONFLICT BETWEEN SMT X AND MIL HELICOPTER Y AT 1B1.

Narrative: WHILE APCHING THE ARPT FOR A STRAIGHT IN TO RWY 21, WE NOTICED AN HELI MANEUVERING W OF THE ARPT. I NOTICED THAT WE WERE DSNDING (MY COPLT WAS OCCUPYING THE LEFT SEAT AND FLYING). AS IS CUSTOM, I ASSUMED THAT THE MLT HELI Y WOULD BE LNDG ON THE PARALLEL TXWY. WHEN MANEUVERING FOR LNDG, I NOTED THAT THE HELI Y POSITIONED HIMSELF ABOVE OUR ALT IN LINE WITH RWY 21. AS FULL FLAPS HAD BEEN SELECTED, MY COPLT PROCEEDED WITH THE LNDG, UNDER THE HELI Y. THOUGH WE WERE ANNOUNCING OUR POS ON UNICOM, WE DID NOT KNOW THE MLT HELI Y ONLY WAS EQUIPPED WITH UHF COM. IF HE HAD VHF, NO PROB WOULD HAVE OCCURRED. WE SHOULD HAVE FLOWN A FULL PATTERN, BUT AFTER 8 1/2 DAY, WE WERE TIRED. I SHOULD HAVE PROVIDED CREW GUIDANCE IN INITIATING A GAR.

Data retrieved from NASA's ASRS site as of July 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.