Summary
The FAA proposes to adopt a new airworthiness directive (AD) for certain McDonnell Douglas Model 717-200 airplanes. This proposed AD would require replacing eight brake fuses of the hydraulic quantity limiter with new or modified and reidentified fuses. This proposed AD is prompted by reports indicating that brake fuses of the hydraulic quantity limiter of the main landing gear have failed. We are proposing this AD to prevent loss of both hydraulic and brake systems if one fuse on each hydraulic system were to fail simultaneously, and consequent reduced controllability of the airplane.