GENERAL
The instrument air system consists of pitot air and static air sources. The system supplies both pitot and
static air pressurc for the airspeed indicator, altimeter and rate of climb indicator. These instruments are face
mounted.
DESCRIPTION AND OPERATION
The pitot air system consists of a pitot mast located on the underside of the left wing with its related
plumbing. A partially or completely blocked pitot head will give erratic or zero reading on the instruments.
Static air system consists of static ports located on the aft sides of the fuselage. These ports are connected
to the airspeed indicator, altimeter, and rate of climb indicator. An alternate static air source is located below
the instrument panel. This alternate static source is part of the standard system and has a shutoff valve which
closes the port when it is not needed. Pitot and static lines can be drained through separate drain valves located
on the left lower side of the fuselage interior.
REMOVAL AND INSTALLATION OF FACE MOUNTED INSTRUMENTS
All instruments are mounted in a similar manner. Remove and install as follows:
—CAUTION—
Be careful when working on instruments as instruments are
easily damaged
1. Remove screws from around perimeter of panel.
2. Remove connections to instrument prior to removing mounting screws of instrumcnt to be removed.
3. Remove instrument.
—NOTE—
Mark instrument connections to ease installation
4. Install instruments as follows:
—CAUTION—
After installation is completed and before replacing the
instrument face panel, check all components for security and
clearance of control column..
a. Position instrument on panel and secure with mounting screws.
b. Attach all connections to instrument.
c. Install face panel and secure with screws.
34 - 02 - 00
Page 34 - 01
Reissued: August 1, 1986
2D9
PIPER AIRCRAFT
PA-28-236
MAINTENANCE MANUAL
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