Small aircraft pilot had near midair collision in ak.

Attributes
ACN	442417
Time
Date	199907
Day	Fri
Local Time Of Day	0601 To 1200
Place
Locale Reference	navaid : tka.vor
State Reference	AK
Altitude	msl single value : 9000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Operator	common carrier : air taxi
Make Model Name	Small Aircraft, High Wing, 1 Eng, Fixed Gear
Operating Under FAR Part	Part 135
Flight Phase	cruise : enroute altitude change descent : intermediate altitude
Flight Plan	VFR
Aircraft 2
Make Model Name	Any Unknown or Unlisted Aircraft Manufacturer
Flight Phase	cruise : level
Person 1
Affiliation	company : air taxi
Function	flight crew : single pilot oversight : pic
Qualification	pilot : instrument pilot : commercial pilot : cfi pilot : atp pilot : multi engine
Experience	flight time last 90 days : 200 flight time total : 12000 flight time type : 1000
ASRS Report	442417
Person 2
Function	flight crew : single pilot oversight : pic
Qualification	pilot : private
Events
Anomaly	conflict : nmac non adherence : required legal separation
Independent Detector	other flight crewa
Resolutory Action	none taken : insufficient time
Miss Distance	horizontal : 0 vertical : 25
Supplementary
Problem Areas	Flight Crew Human Performance
Primary Problem	Flight Crew Human Performance

Narrative:

During mountainous sight-seeing operation while in a constant descent, I passed directly beneath another aircraft. He approached from my 2 O'clock position and I never saw him until he was directly above me. There was no time for avoidance maneuvering and the aircraft was not seen by myself or any of the passenger. Because of the high volume of traffic in the area (part 135 and 91) we have established operating procedures of a common frequency and at least the air taxi pilots make regular position reports, share WX information, etc. I had made my position reports approaching the area but had heard no calls from the other aircraft. This can happen if we both transmit at the same time or because of intervening terrain. As far as looking for other aircraft, my primary attention was to my left front because of the proximity of terrain and I was about to make a turn in that direction. Corrective measures: 1) increased vigilance in all directions, 2) redouble efforts to assure all xmissions are made in the clear, and 3) emphasize to passenger the importance of minimal talk on the intercom but to point out any aircraft they see.

Original NASA ASRS Text

Title: SMA PLT HAD NMAC IN AK.

Narrative: DURING MOUNTAINOUS SIGHT-SEEING OP WHILE IN A CONSTANT DSCNT, I PASSED DIRECTLY BENEATH ANOTHER ACFT. HE APCHED FROM MY 2 O'CLOCK POS AND I NEVER SAW HIM UNTIL HE WAS DIRECTLY ABOVE ME. THERE WAS NO TIME FOR AVOIDANCE MANEUVERING AND THE ACFT WAS NOT SEEN BY MYSELF OR ANY OF THE PAX. BECAUSE OF THE HIGH VOLUME OF TFC IN THE AREA (PART 135 AND 91) WE HAVE ESTABLISHED OPERATING PROCS OF A COMMON FREQ AND AT LEAST THE AIR TAXI PLTS MAKE REGULAR POS RPTS, SHARE WX INFO, ETC. I HAD MADE MY POS RPTS APCHING THE AREA BUT HAD HEARD NO CALLS FROM THE OTHER ACFT. THIS CAN HAPPEN IF WE BOTH XMIT AT THE SAME TIME OR BECAUSE OF INTERVENING TERRAIN. AS FAR AS LOOKING FOR OTHER ACFT, MY PRIMARY ATTN WAS TO MY L FRONT BECAUSE OF THE PROX OF TERRAIN AND I WAS ABOUT TO MAKE A TURN IN THAT DIRECTION. CORRECTIVE MEASURES: 1) INCREASED VIGILANCE IN ALL DIRECTIONS, 2) REDOUBLE EFFORTS TO ASSURE ALL XMISSIONS ARE MADE IN THE CLR, AND 3) EMPHASIZE TO PAX THE IMPORTANCE OF MINIMAL TALK ON THE INTERCOM BUT TO POINT OUT ANY ACFT THEY SEE.

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.