Instrument Panel - Piper ARCHER III Pilot Operating Handbook

PA-28-181, ARCHER III
A vacuum regulator is provided in the system to protect the gyros. The
valve is set so the normal vacuum reads 4.8 to 5.2 inches of mercury, a
setting which provides sufficient vacuum to operate all the gyros at their
rated RPM. Higher settings will damage the gyros and with a low setting the
gyros will be unreliable. The regulator is located behind the instrument
panel and is accessible from below the instrument panel.

7.19 INSTRUMENT PANEL

The instrument panel (Figure 7-15) is designed to accommodate the
customary advanced flight instruments and the normally required powerplant
instruments. The artificial horizon and directional gyro are vacuum operated
and are located in the center of the left hand instrument panel. The vacuum
gauge is located on the upper left hand instrument panel with the electric
standby vacuum pump switch located directly below. The turn indicator the
left side is electrically operated.
The radios are located in the center section of the panel, and the circuit
breakers located in he lower right corner of the panel. All avionics switches
plus pitot heat are grouped below the left radio stack.
Incorporated in the over head switch panel (7-15A) are all the engine
related switches, grouped to the left of center, with exterior lighting switches
grouped to the right of center.
Eengine gauges are installed to the left of the throttle quadrant for
monitoring engine operation. These gauges consist of a combination oil
pressure, oil temperature and fuel pressure gauge, optional exhaust gas
temperature (EGT), and a tachometer (RPM) gauge.
The normal operating range for ground and flight operation is indicated on
the instruments by a green arc. Yellow arcs indicate either a takeoff or
precautionary range. Red radial lines identity the established maximum or
minimum limits. When an instrument needle point touches the edge of the red
radial nearest the yellow or green arc, the limit is met.
ISSUED: JULY 12, 1995
REVISED: FEBRUARY 5, 2010
DESCRIPTION & OPERATION
REPORT: VB-1611
SECTION 7
7-13