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C172 in traffic pattern was near midair collision encounter with helicopter. Tower was unable to communicate due to a stuck microphone on frequency.
| Attributes | |
| ACN | 348733 |
| Time | |
| Date | 199609 |
| Day | Mon |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | atc facility : orh |
| State Reference | MA |
| Altitude | msl bound lower : 2000 msl bound upper : 2000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tower : orh tracon : lax |
| Operator | general aviation : instructional |
| Make Model Name | Skyhawk 172/Cutlass 172 |
| Operating Under FAR Part | Part 91 |
| Flight Phase | other |
| Flight Plan | VFR |
| Aircraft 2 | |
| Make Model Name | Helicopter |
| Operating Under FAR Part | Part 91 |
| Flight Phase | other |
| Person 1 | |
| Affiliation | Other |
| Function | flight crew : single pilot |
| Qualification | pilot : cfi pilot : instrument pilot : commercial |
| Experience | flight time last 90 days : 100 flight time total : 580 |
| ASRS Report | 348733 |
| Person 2 | |
| Affiliation | Other |
| Function | flight crew : single pilot |
| Qualification | pilot : commercial pilot : instrument |
| Events | |
| Anomaly | conflict : nmac |
| Independent Detector | other flight crewa |
| Resolutory Action | none taken : insufficient time none taken : detected after the fact |
| Consequence | Other |
| Miss Distance | horizontal : 200 vertical : 200 |
| Supplementary | |
| Primary Problem | ATC Human Performance |
Narrative:
On sep/xx/96, at approximately XX00 pm my aircraft was involved in a near collision with a helicopter. I was PIC of a cessna 172 landing at orh. I entered class D airspace from the north and was instructed by ATC to enter a right downwind for runway 29, told to report mid-field downwind. I reported mid-field and ATC instructed me to extend downwind for traffic. At this time a helicopter passed over the top of my aircraft from right to left within 200 ft. At the time of this occurrence it should be noted that ATC was having communication problems. The problem was believed to be a microphone which remained open in another aircraft.
Original NASA ASRS Text
Title: C172 IN TFC PATTERN WAS NMAC ENCOUNTER WITH HELI. TWR WAS UNABLE TO COMMUNICATE DUE TO A STUCK MIKE ON FREQ.
Narrative: ON SEP/XX/96, AT APPROX XX00 PM MY ACFT WAS INVOLVED IN A NEAR COLLISION WITH A HELI. I WAS PIC OF A CESSNA 172 LNDG AT ORH. I ENTERED CLASS D AIRSPACE FROM THE N AND WAS INSTRUCTED BY ATC TO ENTER A R DOWNWIND FOR RWY 29, TOLD TO RPT MID-FIELD DOWNWIND. I RPTED MID-FIELD AND ATC INSTRUCTED ME TO EXTEND DOWNWIND FOR TFC. AT THIS TIME A HELI PASSED OVER THE TOP OF MY ACFT FROM R TO L WITHIN 200 FT. AT THE TIME OF THIS OCCURRENCE IT SHOULD BE NOTED THAT ATC WAS HAVING COM PROBS. THE PROB WAS BELIEVED TO BE A MIKE WHICH REMAINED OPEN IN ANOTHER ACFT.
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.