Fuselage And Wing Structures - Piper AZTEC D PA-23-250 Owner's Handbook Manual

SECTION II
THE PIPER AZTEC ''D"
to uniform cylinder head temperatures.
Installed in the instrument. panel is a Fuel Flow Indicator.
This instrument is connected to the Flow Divider and monitors
fuel pressure. The instrument converts fuel pressure to an accu-
rate indication of fuel flow in gallons per hour.
NOTE
An increasing or abnormally high fuel flow in-
dication is a possible symptom of restricted
injector lines or nozzles.
Induction air for the engine enters a large air duct at the rear
of the bottom cowl. The air is directed through a filter, and on to
the servo regulator. A heated alternate air source is incorporated
to provide airflow to the engine in case the normal flow of air
through the filter is restricted. The alternate air door
is
spring
loaded, and will remain closed during normal operation. The
alternate air door will operate automatically, as the normal in-
duction airflow through the filter is restricted, or when the push-
pull control, located on the control pedestal, is placed
in
the
FULL ON position. The control should be placed in the FULL
ON position prior to entering known or expected icing conditions.
FUSELAGE AND WING STRUCTURE
The Aztec fuselage is a composition of four basic units; the
sheet metal tail cone, cabin section, nose section, and the steel
tubular structure which extends from the tail cone to the nose
wheel. The steel tube unit is intended to withstand the high
loads imposed on the center section region of the airplane, and
provides an extra safety factor in this area.
Finish on the tubular unit, as on all steel tube structures is
zinc chromate primer with synthetic enamel.
9
680501