Summary
We propose to adopt a new airworthiness directive (AD) for certain McDonnell Douglas Model 717-200 airplanes. This proposed AD would require modifying the wire installation of the auxiliary hydraulic pump in the right wheel well of the main landing gear (MLG). This proposed AD results from fuel system reviews conducted by the manufacturer. We are proposing this AD to prevent a tire burst when the MLG is in the retracted position from causing damage to the wire assembly of the auxiliary hydraulic pump and subsequent electrical arcing, creating the potential of an ignition source in the center wing tank, which, in combination with flammable fuel vapors, could result in a fuel tank explosion and consequent loss of the airplane.