[Code of Federal Regulations] [Title 14, Volume 2] [Revised as of January 1, 2008] From the U.S. Government Printing Office via GPO Access [CITE: 14CFR121.123] [Page 743-744] TITLE 14--AERONAUTICS AND SPACE CHAPTER I--FEDERAL AVIATION ADMINISTRATION, DEPARTMENT OF TRANSPORTATION (CONTINUED) PART 121_OPERATING REQUIREMENTS: DOMESTIC, FLAG, AND SUPPLEMENTAL OPERATIONS-- Subpart F_Approval of Areas and Routes for Supplemental Operations Sec. 121.123 Servicing maintenance facilities. Each certificate holder conducting supplemental operations must show that competent personnel and adequate [[Page 744]] facilities and equipment (including spare parts, supplies, and materials) are available for the proper servicing, maintenance, and preventive maintenance of aircraft and auxiliary equipment. [Doc. No. 28154, 61 FR 2611, Jan. 26, 1996]