It does look like that sort of plane. Do we know more about where Jill was found? All I see is a "secluded area south of Mulholland."
Los Angeles: Los Angeles Police Department Cold Case detective’s efforts were rewarded with the identity of a suspect in the 28-year-old murder case of Jill Barcomb, who was 18 when her strangled, nearly nude body was found on Franklin Canyon Drive in West Los Angeles. A grand jury indictment...
www.lapdonline.org
I know she was originally thought to be a Hillside Stranger victim, but I'm curious if others have since been found near her, or in any way connected to some kind of small airstrip (??) nearby. (I'm not personally very familiar with LA, having only visited as a tourist, so brainstorming here, may be waaaay out there.)