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An small aircraft aircraft and a helicopter had an near midair collision after the small aircraft extended a downwind leg encroaching on the arrival path of the helicopter's crossing runway.
| Attributes | |
| ACN | 790522 |
| Time | |
| Date | 200806 |
| Local Time Of Day | 1801 To 2400 |
| Place | |
| Locale Reference | airport : zzz.airport |
| State Reference | US |
| Altitude | msl single value : 1800 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tower : zzz.tower |
| Operator | general aviation : personal |
| Make Model Name | Small Aircraft |
| Operating Under FAR Part | Part 91 |
| Flight Phase | descent : approach |
| Route In Use | approach : visual |
| Flight Plan | None |
| Aircraft 2 | |
| Controlling Facilities | tower : zzz.tower |
| Make Model Name | Helicopter |
| Flight Phase | descent : approach |
| Route In Use | approach : visual |
| Person 1 | |
| Affiliation | other |
| Function | flight crew : single pilot |
| Qualification | pilot : cfi pilot : multi engine pilot : instrument pilot : commercial |
| Experience | flight time last 90 days : 20 flight time total : 270 flight time type : 12 |
| ASRS Report | 790522 |
| Events | |
| Anomaly | conflict : nmac non adherence : far non adherence : clearance other spatial deviation |
| Independent Detector | other flight crewa |
| Resolutory Action | flight crew : took evasive action |
| Miss Distance | horizontal : 400 vertical : 300 |
| Supplementary | |
| Problem Areas | Flight Crew Human Performance Airport ATC Human Performance Environmental Factor |
| Primary Problem | Flight Crew Human Performance |
Narrative:
While in the pattern at ZZZ there was a miscom between myself and ATC. While on left downwind for runway 18 I was told to remain south of runway 9/27. I saw that there was departing jet traffic; and extended my pattern to give the departing traffic time to depart in order to avoid wake turbulence. While still on the tower frequency; I listened to the second communications frequency to double check the winds due to gusty conditions. I did not hear communications between the tower and an arriving helicopter while I listened to the winds. As a result of my extended downwind I ended up on a base leg north of runway 9/27. As a result an arriving helicopter had to deviate.
Original NASA ASRS Text
Title: AN SMA ACFT AND A HELICOPTER HAD AN NMAC AFTER THE SMA EXTENDED A DOWNWIND LEG ENCROACHING ON THE ARR PATH OF THE HELICOPTER'S CROSSING RWY.
Narrative: WHILE IN THE PATTERN AT ZZZ THERE WAS A MISCOM BTWN MYSELF AND ATC. WHILE ON L DOWNWIND FOR RWY 18 I WAS TOLD TO REMAIN S OF RWY 9/27. I SAW THAT THERE WAS DEPARTING JET TFC; AND EXTENDED MY PATTERN TO GIVE THE DEPARTING TFC TIME TO DEPART IN ORDER TO AVOID WAKE TURB. WHILE STILL ON THE TWR FREQ; I LISTENED TO THE SECOND COMS FREQ TO DOUBLE CHK THE WINDS DUE TO GUSTY CONDITIONS. I DID NOT HEAR COMS BTWN THE TWR AND AN ARRIVING HELI WHILE I LISTENED TO THE WINDS. AS A RESULT OF MY EXTENDED DOWNWIND I ENDED UP ON A BASE LEG N OF RWY 9/27. AS A RESULT AN ARRIVING HELI HAD TO DEVIATE.
Data retrieved from NASA's ASRS site as of May 2009 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.