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AC 43.13-1B 9/8/98 c.g. position within acceptable limits with a minimum of weight increase. Permanent bal last is often lead plate wrapped around and bolted to the fuselage primary structure (e.i., tail-post, longerons, or bulkhead members). Permanent ballast invariably constitutes a con centrated load; therefore, the strength of the local structure and the attachment of the ballast thereto should be investigated for the design loading conditions pertinent to that particular aircraft. Placard permanent ballast with Per- manent ballast - do not remove. It is not desirable to install permanent ballast by pour ing melted lead into the tail-post or longerons due to difficulties that may be encountered in subsequent welding repair operations. It should be noted that the installation of perma nent ballast results in an increase of aircraft empty weight. See figure 10-19 for ballast computation. The local strength of the com partment in which the ballast is carried and the effect of the ballast on aircraft weight and bal ance should be investigated when disposable ballast is carried. FIGURE 10-16. Example of moment and weight changes resulting from equipment changes. Page 10-20 Par 10-20PDF Image | AFS-640
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