Beyond the Visible: How Pall Aerospace Powers the Future of Flight | Aviation Week

Filtration may not grab headlines, but it underpins aircraft reliability by controlling contamination in fluids, air, and fuel. Aviation Week highlights Pall Corporation’s role over nearly eight decades, tracing its roots to Dr. David B. Pall, who developed a stainless-steel mesh filter to overcome early paper media limits in hydraulic systems on Boeing 707 aircraft. Pall later advanced aviation-standard disposable glass fiber depth media in the 1960s. The article also cites use in NASA’s Apollo program, including a porous metal heat exchanger used in Neil Armstrong’s Apollo 11 spacesuit and filtration supporting lunar module atmosphere protection. In rotorcraft, Pall introduced three-micron absolute filters for helicopter transmission systems and later engine air protection systems branded as Pall PUREair to reduce particulate, sand, and debris ingestion.