Near midair collision between a sightseeing AS350 helicopter cruise the south rim of the haleakala volcano in hawaiian islands and an overtaking C210. Both aircraft turned to increase separation between them.

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Attributes
ACN	395423
Time
Date	199803
Day	Wed
Local Time Of Day	1201 To 1800
Place
Locale Reference	atc facility : ogg
State Reference	HI
Altitude	msl bound lower : 9500 msl bound upper : 9500
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zhn tower : clt
Operator	common carrier : air taxi
Make Model Name	AS 350 Astar/Ecureuil
Operating Under FAR Part	Part 135
Flight Phase	cruise other
Aircraft 2
Make Model Name	Cessna 210 Centurion / Turbo Centurion 210C, 210D
Operating Under FAR Part	other : unknown
Flight Phase	cruise other
Flight Plan	VFR
Person 1
Affiliation	company : air taxi
Function	flight crew : single pilot
Qualification	pilot : instrument pilot : commercial
ASRS Report	395423
Person 2
Function	flight crew : single pilot
Qualification	pilot : instrument pilot : commercial
Events
Anomaly	other anomaly other
Independent Detector	other flight crewa
Resolutory Action	flight crew : took evasive action
Consequence	Other
Miss Distance	horizontal : 300 vertical : 0
Supplementary
Primary Problem	Flight Crew Human Performance

Narrative:

While sightseeing haleakala at XA45 local at 9500 ft along the south rim (1/2 mi off) I made a left turn (180 degree turn from east to west) to show my right side passenger the crater. During the turn I noticed a C210 (which was not on frequency) trying to overtake me on my left at less than 1/4 mi. Our aircraft missed by approximately 300 ft as I altered course right, he altered course left into the national park.

Original NASA ASRS Text

Title: NMAC BTWN A SIGHTSEEING AS350 HELI CRUISE THE S RIM OF THE HALEAKALA VOLCANO IN HAWAIIAN ISLANDS AND AN OVERTAKING C210. BOTH ACFT TURNED TO INCREASE SEPARATION BTWN THEM.

Narrative: WHILE SIGHTSEEING HALEAKALA AT XA45 LCL AT 9500 FT ALONG THE S RIM (1/2 MI OFF) I MADE A L TURN (180 DEG TURN FROM E TO W) TO SHOW MY R SIDE PAX THE CRATER. DURING THE TURN I NOTICED A C210 (WHICH WAS NOT ON FREQ) TRYING TO OVERTAKE ME ON MY L AT LESS THAN 1/4 MI. OUR ACFT MISSED BY APPROX 300 FT AS I ALTERED COURSE R, HE ALTERED COURSE L INTO THE NATIONAL PARK.

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.