2 sight seeing aircraft had an near midair collision.

Attributes
ACN	278450
Time
Date	199407
Day	Fri
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : las
State Reference	NV
Altitude	msl bound lower : 5500 msl bound upper : 5500
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Operator	common carrier : air taxi
Make Model Name	Commercial Fixed Wing
Operating Under FAR Part	Part 135
Flight Phase	cruise other
Flight Plan	VFR
Aircraft 2
Operator	common carrier : air carrier
Make Model Name	Commercial Fixed Wing
Operating Under FAR Part	Part 135
Flight Phase	descent other
Person 1
Affiliation	company : air taxi
Function	flight crew : single pilot
Qualification	pilot : atp
Experience	flight time last 90 days : 160 flight time total : 2200 flight time type : 1100
ASRS Report	278450
Person 2
Affiliation	company : air taxi
Function	flight crew : single pilot
Qualification	pilot : instrument pilot : commercial
Events
Anomaly	conflict : nmac other anomaly other
Independent Detector	other flight crewa
Resolutory Action	none taken : insufficient time
Consequence	Other
Miss Distance	horizontal : 100
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

Flying eastbound at 5500 ft (normal en route grand canyon operators altitude). Another canyon operator reported leaving temple bar (approximately 5-7 mi east of bennelli bay) descending out of 60 wbound. I then announced my position so that he would wait until he passed me to descend, but he elected not to wait, therefore, nearly colliding with my aircraft at the same altitude.

Original NASA ASRS Text

Title: 2 SIGHT SEEING ACFT HAD AN NMAC.

Narrative: FLYING EBOUND AT 5500 FT (NORMAL ENRTE GRAND CANYON OPERATORS ALT). ANOTHER CANYON OPERATOR RPTED LEAVING TEMPLE BAR (APPROX 5-7 MI E OF BENNELLI BAY) DSNDING OUT OF 60 WBOUND. I THEN ANNOUNCED MY POS SO THAT HE WOULD WAIT UNTIL HE PASSED ME TO DSND, BUT HE ELECTED NOT TO WAIT, THEREFORE, NEARLY COLLIDING WITH MY ACFT AT THE SAME ALT.

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.