Downloaded from https://www.everyspec.com MIL-STD-1808C w/CHANGE 1 SYSTEM SUB-SYSTEM TITLE DEFINITION 08 LEVELING AND WEIGHING The subsystem information necessary to properly level the aircraft for any maintenance, overhaul or major repair. Includes units or components specifically dedicated to record, store, or compute weight and balance data. Also includes maintenance practices necessary to prepare and weigh the aircraft. Includes weight and Center of Gravity (CG) data. This system is used for reference only. Note: See -5 series manuals for actual procedures for leveling, weighing and computing CG.
00 GENERAL 10 WEIGHT AND BALANCE The system components on the aircraft dedicated to the specific function of recording, storing, or computing weight and balance data. 20 LEVELING The system instructions necessary to prepare the aircraft for leveling and the leveling procedure. Includes information on the leveling equipment. 30 WEIGHING The system instructions necessary to prepare the aircraft for weighing and the weighing procedure. Includes information on the weighing equipment and limits of variation allowed between physical recorded weight and calculated weight based on specific aircraft records.
40 WEIGHT AND CG DATA The system information for weight and moment or index information characteristic of the aircraft, limitations, datum points and lines, CG range, weight and balance management of fuel and other expendable loads, residual fuel, ballast, and the effects of change-of-role. Expression of CG as a percentage of Mean Aerodynamic Chord (MAC).
Includes a diagram of CG envelope and equipment location charts if necessary, affect on the CG position of dropping or picking up stores (with an example), relevant equipment included in the basic weight, plus variable equipment, e.g., aircraft "role" or "fit-list" equipment, tabulated, and showing weight, load arm and moment or index of each item. Also includes the relationship between the aircraft and Engine Control Unit (ECU) datum lines including the jet pipe or propeller datum lines and the effect of an ECU change. 9