FAA Advisory Circular 43.13-1B
Acceptable Methods, Techniques, and Practices
Aircraft Inspection and Repair
AC 43.13-1B | 10. Weight and Balance | 2. Weighing Procedures | 10-22. Installation of Ballast
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.
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