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SECTION 7
DESCRIPTION & OPERATION
7.25 PITOT-ST ATIC SYSTEM
PA-28-181, ARCHER III
Dynamic and static pressures are both supplied by a single pitot head •
installed on the bottom of the left wing. Independent pressure lines plumbed
from the pitot mast through the wing and fuselage connect to the Garmin air data
computer and the standby instrument (Figure 7-1 I) located on the instrument
panel.
An alternate static source is standard equipment. The control valve is located
below the left side of the instrument panel. When the valve is set in the alternate
position, the altimeter, vertical speed indicator and airspeed indicator on the PFD
and the standby instrument will be using cabin air for static pressure. The storm
window and cabin vents must be closed and the cabin heater and defroster must
be on during alternate static source operation. The altimeter error is less than 50
feet unless otherwise placarded.
Both the pilot and static Unes can be drained through separate drain valves
located on the left lower side of the fuselage interior.
A heated pitot head, which alleviates problems with icing and heavy rain,
•
is standard equipment. The switch for the heated pitot he.ad is located on the
instrument panel above and to the left of the throttle quadrant.
To prevent bugs and water from entering the pitot and static pressure holes,
a cover should be placed over the pitot head on the ground when the aircraft is
parked. A partially or completely blocked pilot head will give erratic or zero
readings on the instruments.
NOTE
During the preflight, check to make sure the pilot
cover is removed.
REPORT: VB-2749
7-58
ISSUED: December 22, 2017
REVISED: March 27, 2020
•
Содержание ARCHER III
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