A sight seeing helicopter pilot reported a near miss with another touring helicopter after convergin...

Narrative:

I was enroute to boulder city airport; approaching black point on wilson's ridge from temple bar (east to west) when I heard another helicopter make a radio position report'...black point...' and I think '4;500'. I had already been looking left and right as I approached black point and had not seen him. Then through to pilot-side roof window I saw the other helicopter cross over directly above; what appeared less than 100 feet vertical separation. The other helicopter was coming from the south east; heading west. After the other pilot had passed over top; I made my black point radio call and asked if he was the only one crossing (I was worried another might be over my left shoulder). The other helicopter was unaware of my location (he hadn't seen me at all) and so I made another radio call to make it clear I was to the south of his position heading west and he continued north-west towards the hoover dam.contributing factors:both tour routes converge at the same point and altitude from different locations. I was flying a right seat [helicopter] and the other aircraft was a left seat helicopter and due to the convergence angle neither pilot could see the other.

Original NASA ASRS Text

Title: A sight seeing Helicopter Pilot reported a near miss with another touring helicopter after converging over Black Point near Hoover Dam. One helicopter pilot was in the right seat while the other pilot flew left seat and neither pilot saw the other.

Narrative: I was enroute to Boulder City Airport; approaching Black Point on Wilson's Ridge from Temple Bar (east to west) when I heard another Helicopter make a radio position report'...Black Point...' and I think '4;500'. I had already been looking left and right as I approached Black Point and had not seen him. Then through to pilot-side roof window I saw the other helicopter cross over directly above; what appeared less than 100 feet vertical separation. The other helicopter was coming from the south east; heading west. After the other pilot had passed over top; I made my Black Point radio call and asked if he was the only one crossing (I was worried another might be over my left shoulder). The other helicopter was unaware of my location (he hadn't seen me at all) and so I made another radio call to make it clear I was to the south of his position heading west and he continued north-west towards the Hoover Dam.Contributing factors:Both tour routes converge at the same point and altitude from different locations. I was flying a right seat [helicopter] and the other aircraft was a left seat helicopter and due to the convergence angle neither pilot could see the other.

Data retrieved from NASA's ASRS site 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.

Attributes
ACN	1323716
Time
Date	201601
Local Time Of Day	1201-1800
Place
Locale Reference	BVU.Airport
State Reference	NV
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Make Model Name	Helicopter
Operating Under FAR Part	Part 135
Flight Phase	Cruise
Aircraft 2
Make Model Name	Helicopter
Operating Under FAR Part	Part 135
Flight Phase	Cruise
Person 1
Function	Single Pilot Pilot Flying Captain
Qualification	Flight Crew Instrument Flight Crew Commercial Flight Crew Flight Instructor
Experience	Flight Crew Last 90 Days 175 Flight Crew Total 1850 Flight Crew Type 120
Events
Anomaly	Conflict NMAC
Miss Distance	Horizontal 0 Vertical 100

A sight seeing helicopter pilot reported a near miss with another touring helicopter after converging over black point near hoover dam. One helicopter pilot was in the right seat while the other pilot flew left seat and neither pilot saw the other.