Summary
The FAA proposes to adopt a new airworthiness directive (AD) for all McDonnell Douglas Model MD-90-30 airplanes. This proposed AD would require replacing, with improved parts, certain existing fluorescent light lamp holders located in the ceiling panels and life raft ceiling support housings, and behind the overhead stowage compartments in the main cabin. This proposed AD is prompted by reports of failure of fluorescent light lamp holders in the main cabin. We are proposing this AD to prevent chafing of the lamp holder power wire against the mounting bracket, and moisture intrusion into the lamp holders, which could result in failure of the lamp holders and consequent smoke and fire in the airplane cabin.