Summary
The FAA withdraws a notice of proposed rulemaking (NPRM) that proposed a new airworthiness directive (AD) for certain Gulfstream Aerospace LP Model Galaxy and Gulfstream 200 airplanes. The proposed AD would have required repetitive inspections for damage of the flexible supply lines of the pilot and copilot oxygen mask boxes, and eventual replacement of the lines with new rigid tubes. Since the proposed AD was issued, we have received new data that 100% of the affected worldwide fleet has accomplished the hardware replacement in accordance with the service bulletin specified in the proposed AD. Accordingly, the proposed AD is withdrawn.