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nonflammable fluids overboard through a drain hole on the APU
cowl door.
APU Engine Drain System
These drains come together at the forward drain collector tube:
* Fuel control unit (FCU) seal
* Surge control valve (SCV) seal
* Inlet guide vane actuator (IGVA) seal.
The APU load compressor seal connects to the middle drain
collector tube.
These drains come together at the aft drain collector tube:
* Combustor case
* Eductor
* Muffler.
The drain collector contacts the drain cup when the APU cowl
door is closed.
Compartment Drain System
The compartment drain system collects external APU engine
leakage and fluids that enter the APU compartment through the
eductor inlet. This fluid drains through the APU cowl door. The
drain extends past the cowl door to keep fluid off the airplane
skin.
Training Information Point
Fluid drainage from the drain mast must be investigated to
determine the source of the leak. Fuel or oil leakage from the
FCU, SCV, or IGVA is an indication of an APU failure.
Fluid leakage from the door drains through the door drain. The
door drain connects to the drain mast. Oil or fuel leakage from
the compartment drain shows a loose connection on the APU.
You should correct the cause of the leakage. Water leakage
from the drain mast is usual.
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General
These APU components send fuel and oil to the drain mast on
the APU access door:
* Combustion chamber fuel
* Eductor/muffler
* Load compressor seal
* Surge control valve (SCV) actuator seal
* Inlet guide vane (IGV) actuator seal
* Fuel control unit seal.
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Purpose
The APU insulation panels provide thermal and fire insulation
between the APU and APU compartment structure.
Physical Description
There are seven different insulation panels. Each panel fits in a
particular area of the APU compartment.
The panels are made of stainless steel face sheets with
insulation between the face sheets.
Training Information Point
The APU insulation panels are not easily damaged, however, if
the panels are punctured, you should repair the damaged panel
as soon as possible. If you do not repair a puncture
immediately, the panel can store fluids in the insulation. If
fluids get into the insulation material, you must replace the
panel. The air inlet scoop replaces the foam and support
insulation (egg crate) that were installed between the APU
insulation panels and the bulkhead. During an airplane
operation, the air inlet scoop supplies forced outside air
through the empty space between the APU insulation panels
and the bulkhead for ventilation and for the removal of
flammable or unwanted fluids. The location of the air inlet
scoop is behind the forward insulation panel and adjacent to the
forward right side of the APU cowl door.
　
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