Weight and Balance Control— Commuter Category and  Large Aircraft Chapter 9 Introduction This chapter discusses general guidelines and procedures for  weighing large fixed-wing aircraft exceeding a takeoff weight  of 12,500 pounds. Several examples of center of gravity (CG)  determination for various operational aspects of these aircraft  are also included. Persons seeking approval for a weight and  balance control program for aircraft operated under Title  14 of the Code of Federal Regulations (14 CFR) part 91,  subpart K, 121, 125, or 135 should consult with the Flight  Standards District Office (FSDO) or Certificate Management  Office (CMO) that has jurisdiction in their area. Additional  information on weight and balance for large aircraft can be  found in Federal Aviation Administration (FAA) Advisory  Circular (AC) 120-27, Aircraft Weight and Balance Control,  FAA Type Certificate Data Sheets (TCDS), and the aircraft  flight and maintenance manuals for specific aircraf