high-temperature insulation (fig. 3-3) to protect
aluminum structures and electrical lines near the
ducting. Bellows assemblies are manufactured for
two functions. The tolerance compensator
(fig. 3-4) can be adjusted in length and allows for
easier removal and replacement of the bleed-air
duct. The thermal compensator (fig. 3-5) allows
for thermal expansion throughout the bleed-air
ducting. To support and brace the ducting,
flexible mounting brackets are used (fig. 3-6). The
use of these and other types of support brackets
will vary with location and type of duct used. Air-
conditioning distribution lines are manufactured
from aluminum alloy and are subjected to
relatively low pressures and temperatures.
Figure 3-3.Bleed-air ducting.
Figure 3-4.Tolerance compensator.
Figure 3-5.Thermal compensator.
Figure 3-6.Flexible mounting brackets.