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Chapter 34 Navigation
Maintenance Manual and Illustrated Parts Catalogue

Extra EA -400

Navigation
Page Date: 8. December 1999
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Page 1
Chapter 34
Navigation Maintenance Manual and Illustrated Parts Catalogue
Extra EA -400
Navigation
Page 2
34

Page Date: 5. July 2002
Table of Contents
34-00-00
GENERAL .........................................................................................................4
Pitot / Static Pressure Systems ............................................................................4
Avionics...............................................................................................................4
34-10-00
FLIGHT ENVIRONMENTAL DATA ............................................................5
34-10-01
Altimeter.............................................................................................................5
Troubleshooting...................................................................................................5
Removal (Pilot's Side) .........................................................................................6
Installation (Pilot's Side) .....................................................................................6
Removal (Copilot's Side).....................................................................................7
Installation (Copilot's Side) .................................................................................7
34-10-02
Airspeed Indicator.............................................................................................8
Troubleshooting...................................................................................................8
Removal (Pilot's Side) .........................................................................................8
Installation (Pilot's Side) .....................................................................................9
Removal (Copilot's Side).....................................................................................9
Installation (Copilot's Side) ...............................................................................10
34-10-11

Pitot Tube .........................................................................................................10
Removal (LH / RH Side) ...................................................................................10
Installation (LH / RH Side) ...............................................................................10
34-10-12

Static Port .........................................................................................................11
Removal (LH / RH Side) ...................................................................................11
Installation (LH / RH Side) ...............................................................................11
34-10-13
Stall Warning Sensor ......................................................................................11
Removal (LH / RH Side) ...................................................................................11
Installation (LH / RH Side) ...............................................................................12
Maintenance Manual and Illustrated Parts Catalogue

Extra EA -400

Navigation
Page Date: 5. July 2002
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Page 3
34-20-00
ATTITUDE AND DIRECTION .................................................................... 13
34-20-01
Turn Coordinator ........................................................................................... 13
Troubleshooting ................................................................................................ 13
Removal ............................................................................................................ 13
Installation......................................................................................................... 14
34-20-02
ADI KI - 256 .................................................................................................... 15
Removal ............................................................................................................ 15
Installation......................................................................................................... 15
34-20-03
EHSI ED - 461, EADI ED - 462 ..................................................................... 16
Removal ............................................................................................................ 16
Installation......................................................................................................... 17
Maintenance Manual and Illustrated Parts Catalogue
Extra EA -400
Navigation
Page 4
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Page Date: 5. July 2002
34-00-00
GENERAL
Pitot / Static Pressure Systems
Providing pitot and static pressure for the pilot's and copilot's instruments two
independent systems are installed. Each system consists of a heated pitot head
located at about 3/4 of the wing span, the tubing including a drain and the
respective instruments. The heated static ports are located on both sides of the
rear fuselage. The two toggle-type drains are located at the fuselage underside,
between the keelbeams. They are accessible by the RH side, round cover plate
between nose gear and main gear doors, together with the gascolator.
When the pitot heat switches are placed in the ON position, the heating
elements in the pitot heads are electrically heated to maintain proper operation
of the systems during icing conditions.
Normally, the heating elements can only be activated when airborne. On
ground the system is deactivated by the squat switch, which detects aircraft
being on ground.
For testing on ground, pitot heat switches provide a TEST position.
CAUTION
In testing mode, do not operate pitot & static heat longer than 10 seconds
to prevent overheating of the heating elements.
CAUTION
Care should be taken when an operational check of the heated pitot heads
is being performed on the ground. The units become very hot.
Avionics
With the EA-400, different combinations of standard and optional aviation
equipment are installed. See Pilot's Operating Handbook, Section 6 Equipment
List for detailed information.
Generally, removal and installation procedures are similar with all types of
instruments.
IMPORTANT
Avionics service and repair work requires special skills, tools and test
equipment. In case of instrument failure or malfunction contact manu-
facturer or authorized service center.
For driving the gyro installation, negative air pressure is distributed by the
vacuum system. Refer to Ch. 37-00-00 for system description.
For vacuum and pressure system surview, see Figure 30-01.

Maintenance Manual and Illustrated Parts Catalogue

Extra EA -400

Navigation
Page Date: 5. July 2002
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34-10-00
FLIGHT ENVIRONMENTAL DATA
34-10-01
Altimeter
Troubleshooting
Complaint
Possible Cause
Remedy
Excessive scale error
Improper calibration
adjustment
Contact manufacturer
Excessive pointer oscillation
Defective mechanism
Contact manufacturer
High or low reading
Improper venting
Eliminate leak in static
pressure system
Setting knob is hard to turn
Wrong lubrication or lack of
lubrication
Contact manufacturer
Inner reference marker fails to
move when setting knob is
rotated
Out of engagement
Contact manufacturer
Setting knob set screw loose
or missing
Not tight when altimeter was
reset
Tighten instrument screw, if
loose. Contact manufacturer, if
screw is missing
Cracked or loose cover glass
Case gasket hardened
Contact manufacturer
Dull or discolored markings
Age

Barometric scale and reference
markers out of synchronism
Slippage of mating parts
Contact manufacturer
Barometric scale and reference
markers out of synchronism
with pointers
Drift in mechanism
Contact manufacturer
Altimeter sticks at altitude or
does not change with change
of altitude
Water or restriction in static
line
Remove static lines from all
instruments; blow line clear
from cockpit to static ports
Altimeter changes reading as
aircraft is banked
Water in static line
Remove static lines from all
instruments; blow lines clear
from cockpit to static ports
Altimeter requires resetting
frequently
Temperature compensator
inoperative
Contact manufacturer

NOTE
When any connections in the static system are opened for checking, system
must be rechecked per FAR 23.1325 Maintenance Manual and Illustrated Parts Catalogue
Extra EA -400
Navigation
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Page Date: 5. July 2002
Removal (Pilot's Side)

Detail Steps/Work Items
Key Items
1 Remove 8 Phillips screws around left main
panel

2 Remove 4 Phillips screws securing ED - 461
to panel

3 Remove 4 Phillips screws securing ED - 462
to panel

4 Slightly swivel down left main panel
Take care not to damage
flexi