Summary
We propose to adopt a new airworthiness directive (AD) for certain Kidde Graviner hand-operated fire extinguishers as installed on, but not limited to, various transport and small airplanes. This proposed AD was prompted by a report that a fire extinguisher failed to operate when the activation lever was pressed. This proposed AD would require modifying the affected fire extinguishers. We are proposing this AD to prevent fire extinguishers from failing to operate in the event of a fire, which could jeopardize occupants' safety and continuation of safe flight and landing.