The FAA has calculated that pilots with as little as 10% CO hemoglobin saturation can experience the effects of carbon monoxide poisoning, and the NTSB has advised that aircraft maintenance personnel provide a thorough inspection of exhaust systems, air ducting, door and window seals, and firewalls both at the annual inspection and during routine 100-hour inspections. Additionally, the FAA recommends the installation of CO detectors and the use of CO detection equipment during preflight checks, inspections, and maintenance.
