§ 125.131 - Fuel lines and fittings in designated fire zones., Subpart E - Special Airworthiness Requirements, Part 125 - Certification and Operations: Airplanes Having a Seating Capacity of 20 or More Passengers or a Maximum Payload Capacity of 6,000 Pounds or More; and Rules Governing Persons on Board Such Aircraft, SubChapter G - Air Carriers and Operators for Compensation or Hire: Certification and Operations, Chapter I - Federal Aviation Administration, Department of Transportation, Title 14 - Aeronautics and Space, Code of Federal Regulations