Action
Notice of proposed rulemaking (NPRM).
Summary
We propose to adopt a new airworthiness directive (AD) for certain Siemens S.A.S. smoke detectors installed on various transport category airplanes. This proposed AD was prompted by a report that the affected smoke detectors failed an acceptance test. This proposed AD would require inspection and replacement of the affected smoke detectors. We are proposing this AD to correct the unsafe condition on these products.