|37000 Feet||Browse and search NASA's
Aviation Safety Reporting System
|Local Time Of Day||1201 To 1800|
|Locale Reference||airport : vys|
|Altitude||agl bound lower : 75|
agl bound upper : 75
|Make Model Name||Helicopter|
|Operating Under FAR Part||Part 91|
|Flight Phase||cruise other|
|Function||flight crew : single pilot|
|Qualification||pilot : instrument|
pilot : commercial
|Experience||flight time last 90 days : 40|
flight time total : 1662
flight time type : 935
|Function||observation : passenger|
observation : observer
|Qualification||other other : other|
|Anomaly||aircraft equipment problem : less severe|
non adherence other
|Independent Detector||other flight crewa|
|Resolutory Action||flight crew : took evasive action|
|Air Traffic Incident||other|
During pwrline patrol with pilot and 2 observers, aircraft performed evasive action to avoid a set of wires perpendicular to flight path. The aircraft had turned west to follow pwrlines through an open field. The aircraft was crabbed into the wind to allow a better view for the observers, and had flown 600 ft when pilot noticed wires. Pilot lowered collective and banked right. As the aircraft descended into the open field, the pilot leveled the aircraft as the back skid skimmed the ground. The pilot brought the aircraft to a hover, then landed. The pilot and observers discussed what had happened. The pilot had not seen the crossing wires because he was looking left at buildings and surrounding areas for livestock and farm animals sensitive to noise. The forward observer had seen the crossing wires upon turning west and assumed the pilot had seen them. He kept waiting for pilot to increase altitude to overfly the lines. The forward observer said nothing during the entire episode. The back seat observer had not seen the crossing wires due to aircraft position and obstructions in the aircraft. (Ie, front seat headrest, both front seat occupants, etc.) the pilot and back seat observer had flown together before. This was the first patrol flight for the forward observer. During the briefing wire avoidance was discussed and responsibility for avoidance was to be shared by all in the aircraft. Factors: pilot distraction by secondary considerations (noise abatement). Forward observer's lack of experience -- may have been intimidated to call attention to obstacle.
Original NASA ASRS Text
Title: PLT OF A HELI PWRLINE PATROL TAKES QUICK EVASIVE ACTION AT 75 FT AGL TO AVOID AN UNKNOWN PWRLINE PERPENDICULAR TO THEIR FLT PATH. THE FORWARD PAX OBSERVER DID OBSERVE THE LINE AHEAD OF TIME BUT DID NOT CALL IT TO THE RPTR'S ATTN.
Narrative: DURING PWRLINE PATROL WITH PLT AND 2 OBSERVERS, ACFT PERFORMED EVASIVE ACTION TO AVOID A SET OF WIRES PERPENDICULAR TO FLT PATH. THE ACFT HAD TURNED W TO FOLLOW PWRLINES THROUGH AN OPEN FIELD. THE ACFT WAS CRABBED INTO THE WIND TO ALLOW A BETTER VIEW FOR THE OBSERVERS, AND HAD FLOWN 600 FT WHEN PLT NOTICED WIRES. PLT LOWERED COLLECTIVE AND BANKED R. AS THE ACFT DSNDED INTO THE OPEN FIELD, THE PLT LEVELED THE ACFT AS THE BACK SKID SKIMMED THE GND. THE PLT BROUGHT THE ACFT TO A HOVER, THEN LANDED. THE PLT AND OBSERVERS DISCUSSED WHAT HAD HAPPENED. THE PLT HAD NOT SEEN THE XING WIRES BECAUSE HE WAS LOOKING L AT BUILDINGS AND SURROUNDING AREAS FOR LIVESTOCK AND FARM ANIMALS SENSITIVE TO NOISE. THE FORWARD OBSERVER HAD SEEN THE XING WIRES UPON TURNING W AND ASSUMED THE PLT HAD SEEN THEM. HE KEPT WAITING FOR PLT TO INCREASE ALT TO OVERFLY THE LINES. THE FORWARD OBSERVER SAID NOTHING DURING THE ENTIRE EPISODE. THE BACK SEAT OBSERVER HAD NOT SEEN THE XING WIRES DUE TO ACFT POS AND OBSTRUCTIONS IN THE ACFT. (IE, FRONT SEAT HEADREST, BOTH FRONT SEAT OCCUPANTS, ETC.) THE PLT AND BACK SEAT OBSERVER HAD FLOWN TOGETHER BEFORE. THIS WAS THE FIRST PATROL FLT FOR THE FORWARD OBSERVER. DURING THE BRIEFING WIRE AVOIDANCE WAS DISCUSSED AND RESPONSIBILITY FOR AVOIDANCE WAS TO BE SHARED BY ALL IN THE ACFT. FACTORS: PLT DISTR BY SECONDARY CONSIDERATIONS (NOISE ABATEMENT). FORWARD OBSERVER'S LACK OF EXPERIENCE -- MAY HAVE BEEN INTIMIDATED TO CALL ATTN TO OBSTACLE.
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.