Downloaded from https://www.everyspec.com MIL-STD-1808B SYSTEM SUB-SYSTEM TITLE DEFINITION 51 STANDARD PRACTICES: STRUCTURES The subsystems that contain the standard practices applicable to the entire structure of the aircraft. Excludes practices covered in other manuals or systems. Practices for a particular application are included in the appropriate structure system. 00 GENERAL Includes airplane major structural breakdown diagram; primary and secondary structure diagram; principal area and dimensional data; restricted area diagram; zoning diagram; access door and panel identification; glossary.
10 INVESTIGATION, CLEANUP, AND AERODYNAMIC SMOOTHNESS Includes definition of damage classifications; cleanup of dents, cracks, scratches, corrosion, etc.; aerodynamic smoothness requirements; permissible contour variations, gaps, and mismatch data. 20 PROCESSES Includes special processes. Does not include general engineering practices unless specific deviations are required. Unique processes, such as welding specifications, relative to a single repair, are included in the applicable repair and only referenced here. 30 MATERIALS Includes description of materials (metallic and nonmetallic) including extrusions, formed sections, sheet, sealants, adhesives, and special materials used.
Permissible substitutes and sources of supply are also included. 40 FASTENERS Includes description of fastener types, materials, and sizes; procedures for fastener installation and removal, including hole preparation; fastener strength values and substitution data. 50 SUPPORT OF AIRPLANE FOR REPAIR AND ALIGNMENT CHECK PROCEDURES Includes procedures for supporting the airplane to relieve loads during repairs, locating supports and contour dimensions required, ground equipment, checking principal alignment or symmetry dimensions and permissible variations, etc. 60 CONTROL SURFACE BALANCING Includes procedures for adjusting the mass balance of control surfaces after repair.
70 REPAIRS Includes typical repairs suitable for general use, not limited to one system. 57