14 CFR 135.607 Flight Data Monitoring System
Subpart L—Helicopter Air Ambulance Equipment, Operations, and Training Requirements
A reference copy of the official regulation text for study. It is not legal advice or an FAA interpretation; always confirm against the current official source.
After April 23, 2018, no person may operate a helicopter in air ambulance operations unless it is equipped with an approved flight data monitoring system capable of recording flight performance data. This system must:
(a) Receive electrical power from the bus that provides the maximum reliability for operation without jeopardizing service to essential or emergency loads, and
(b) Be operated from the application of electrical power before takeoff until the removal of electrical power after termination of flight.