AD NUMBER: 2006-04-04
MANUFACTURER: Smoke Detectors
SUBJECT: Airworthiness Directive 2006-04-04 SUMMARY: The FAA is
adopting a new airworthiness directive (AD) for certain smoke
detectors installed on various transport category airplanes.
This AD requires replacing the affected smoke detectors with
modified smoke detectors. This AD results from a report indicating
that the affected smoke detectors can "lock up" during electrical
power transfer from the auxiliary power unit to the engines.
We are issuing this AD to identify and provide corrective action
for a potentially inoperative smoke detector and to ensure that the
flightcrew is alerted in the event of a fire.