Landinggear - Piper CHEROKEE TURBO ARROW III 1976 Pilot Operating Handbook

SECTION 7
PIPER
AIRCRAFT CORPORATION
DESCRIPTION AND OPERATION
PA-28R-201T,
CHEROKEE
TURBO ARROW
III
15
20
-
O
ap
25
HU
LANDING GEAR
SELECTOR
Figure 7-3
7.9 LANDING GEAR
The
Cherokee Turbo Arrow III
is
equipped with a retractable
tricycle landing gear, which is
hydraulically
actuated
by an electrically powered reversible pump. The pump
is controlled by a selector
switch on the instrument panel
to
the left of the control quadrant (Figure 7-3). The landing gear
is
retracted or extended in about seven seconds.
Also incorporated
in the system is a pressure sensing device which lowers the gear regardless of gear
selector position, depending
upon
airspeed and engine power
(propeller
slipstream). Gear extension
is
designed
to
occur, even if the selector is in the up position, at airspeeds below approximately 103
KIAS
with power off.
The extension
speeds will vary from approximately 78 KTS
to
approximately 103 KIAS depending
on
power
settings and altitude. The device also prevents
the
gear
from retracting at airspeeds
below
approximately 78 KTS
with full power,
though the
selector switch may
be in the
up position.This speed
increases with
reduced power and/or increased altitude.
Manual
override of
the device is provided by an
emergency gear
lever located between
the front
seats to
the right
of the flap handle
(refer
to
Figure
7-9).
The sensing device operation
is controlled by differential air pressure across a flexible
diaphragm
which is
mechanically linked
to
a hydraulic valve and an electrical switch which actuates
the pump motor.
A high
pressure and static air
source
for actuating
the diaphragm
is provided in a mast mounted on
the
left side of
the
fuselage above the
wing. Any obstruction of
the
holes in
this
mast will cause the
gear
to
extend. An
optional heated mast is available
to
alleviate obstruction in icing conditions. The optional heated mast is
turned
on
whenever the
"PITOT HEAT" is turned
on.
REPORT: VB-800
ISSUED: DECEMBER 20, 1976
7-6
REVISED:
JULY 13 1977