Narrative:

I flew to lopez landfill for a landing (lopez landfill is located just northeast of the 118 and 210 freeway interchange). I was a single pilot; with three crew members in the cabin. I departed and transitioned east to whiteman airspace via the 118 freeway. I estimate my altitude was approximately 600-700 ft AGL. I contacted whiteman tower just after passing over the 405 freeway prior to entering whiteman airspace; and requested the 118 freeway transition to lopez landfill. Whiteman tower approved the transition; and notified me of traffic at my 1 o'clock; and then immediately corrected the traffic to my 10 to 11 o'clock. I scanned my 1 o'clock area first; and then scanned 10 to 11 o'clock area after hearing the correction. I quickly notified whiteman tower 'negative traffic.' I continued east along the 118 freeway for several seconds; and just prior to the 5 freeway interchange; a crewmember called out traffic at my 3 to 4 o'clock; approximately 100 ft above us and 200-300 ft away. At the same time the crewmember spoke up; the other aircraft notified whiteman tower that they saw our aircraft; and whiteman tower notified them that we were transitioning along the 118 freeway. The traffic was flying east northeast while we were flying east; so we were on converging paths; however; we were flying faster; approximately 120 knots; and we were pulling away from the traffic that looked like a single engine cessna. I immediately descended to approximately 500 ft to ensure that we were well below the traffic. I then continued my transition to lopez landfill via the 118 freeway. I don't believe we were ever in danger of colliding because we were at different altitudes and airspeeds. I speculate that the other aircraft was originally at the 2 to 3 o'clock position when I was first informed of the other aircraft instead of the 10 or 11 or 1 o'clock position. I did not see the other aircraft because they blended in with surrounding city and mountain terrain in the distance.

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Original NASA ASRS Text

Title: Helicopter pilot reported a NMAC while transitioning WHP airspace.

Narrative: I flew to Lopez Landfill for a landing (Lopez Landfill is located just northeast of the 118 and 210 Freeway interchange). I was a single pilot; with three crew members in the cabin. I departed and transitioned east to Whiteman Airspace via the 118 Freeway. I estimate my altitude was approximately 600-700 ft AGL. I contacted Whiteman Tower just after passing over the 405 Freeway prior to entering Whiteman Airspace; and requested the 118 Freeway transition to Lopez Landfill. Whiteman Tower approved the transition; and notified me of traffic at my 1 o'clock; and then immediately corrected the traffic to my 10 to 11 o'clock. I scanned my 1 o'clock area first; and then scanned 10 to 11 o'clock area after hearing the correction. I quickly notified Whiteman Tower 'negative traffic.' I continued East along the 118 Freeway for several seconds; and just prior to the 5 Freeway interchange; a crewmember called out traffic at my 3 to 4 o'clock; approximately 100 ft above us and 200-300 ft away. At the same time the crewmember spoke up; the other aircraft notified Whiteman Tower that they saw our aircraft; and Whiteman Tower notified them that we were transitioning along the 118 Freeway. The traffic was flying east northeast while we were flying east; so we were on converging paths; however; we were flying faster; approximately 120 knots; and we were pulling away from the traffic that looked like a single engine Cessna. I immediately descended to approximately 500 ft to ensure that we were well below the traffic. I then continued my transition to Lopez Landfill via the 118 Freeway. I don't believe we were ever in danger of colliding because we were at different altitudes and airspeeds. I speculate that the other aircraft was originally at the 2 to 3 o'clock position when I was first informed of the other aircraft instead of the 10 or 11 or 1 o'clock position. I did not see the other aircraft because they blended in with surrounding city and mountain terrain in the distance.

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.