Pitot air system consists of a pitot mast located on the bottom side of the left wing, with its' related
plumbing. Impact air pressure entering the pitot is transmitted from the pitot inlet through hose and tubing routed
in through the wing to the airspeed indicator on the instrument panel.
Static air system consists of a static port located on the bottom of the pitot mast. The static port is directly
connected to the airspeed indicator, altimeter and rate of climb indicator, on the instrument panel, by means of
hose and tubing routed through the wing along with the pitot line. An alternate static air source is located below
the instrument panel in front of the pilot. The alternate static source is part of the standard system and has a
shutoff valve which closes the port when it is not needed. A placard giving instructions for use is located on the
instrument panel.
5A
20A
-
+
AUXILIARY AIR
PUMP 4A3 - 1
V6A 20
373 - 19 GND.
373 - 17 NEG.
373 - 13
373 - 15 POS.
(FRONT VIEW)
AUX ON
VAC OFF
(REAR VIEW)
D.
C.
B
U
S
MANIFOLD AND
SWITCHES
1H5 - 24
NORMAL
VACUUM
REGULATOR
WB4
V2A20
V1A20
V3A20
V3C20
CONTROL SWITCH
(W / ANNUNCIATOR LIGHTS)
AND WIRE ASSY.F7 - 85 -1
2 PIN
CONNECTOR
V4A20
V5A20
ETI ASSY F7 - 97 - 1
EMI FILTER AND
WIRE ASSY F7 - 84 - 1
V7A14
AUX PUMP
RELAY F7 - 64 - 2
FIGURE 10 -3 AUXILIARY VACUUM SYSTEM
PIPER AIRCRAFT
PA-28-161 CADET
AIRPLANE MAINTENANCE MANUAL
Issued: FEBRUARY. 28, 1989
INSTRUMENT
2B20
