FAA 2019-16-16

Applies to affected helicopters with a certain part-numbered Pall Aerospace Corporation Inlet Barrier Filter (IBF) element installed. Retains the requirements of AD 2018-18-12, which required revising the rotorcraft flight manual supplement (RFMS) to prohibit operating a helicopter with an IBF element in wet weather and drying or replacing the IBF element if wet. Updated AD no longer allows reinstallation of a filter after it has been removed and also expands the applicability, provides an optional terminating action for the RFMS revision, and prohibits installing the affected IBFs on any helicopter.