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The pitot-static system supplies pitot pressure and static pressure to the air data instruments. A
pitot static probe mounted below the left wing senses pitot and static pressure.
The probe does not have a heater element to prevent icing.
The autopilot if installed has a separate pitot static pressure line that is mounted under the left
wing of the aircraft.
Flexible hoses connect the pitot-static probe to the air data instruments. Pitot pipes are green.
Static pipes are purple or blue. Push-fit plastic connectors connect the flexible pipes. T-pieces
make pipe junctions. There are in-line bulkhead-connectors at the wing root.
Both pitot and static pipes have a water trap in the lowest part of the pipe run. T-pieces divide
the pipe into 2 runs. The top run goes directly to the instruments. The bottom run forms a sump
before re-joining the top run at a second T-piece. The water traps are below the left seat shell.
B. Blind Altitude Encoder
The blind altitude encoder is located on the aft side of the firewall on the left. The encoder
connects to the static system. The encoder supplies these outputs:
− To the transponder for mode C operation.
− To GPS systems that can receive an altitude input.
You can calibrate the output of the encoder to align with the airplane altimeter reading.
Calibration potentiometers are beside the static port. Table A in Trouble-Shooting lists the logic
outputs for altitudes between 1000 and 16200 feet.
Navigation
DA20-C1 AMM
Page 2
29 Apr 2004 34-10-00 Doc # DA 201-C1
Rev. 9
Figure 1: Pitot-Static System Schematic
DA20-C1 AMM
Navigation
Doc # DA 201-C1
Rev. 0 34-10-00 Page 3
19 Dec 1997
C. OAT Indicating System
The OAT indicator is a digital instrument. The indicator and sensor are 1 unit. The indicator
operates with the GEN/BAT switch set to ON. The temperature sensor is located in the right
NACA inlet.
Figure 2: Instrument Panel Locations.
Navigation
DA20-C1 AMM
Page 4
09 Aug 2001 34-10-00 Doc # DA 201-C1
Rev. 7
Pitot Pipe.
Static Pipe
Pitot-Static Probe
Below the Wing
Blind Altitude Encoder
on Aft Face of Firewall
Flight Instruments
Temperature sensor
for the OAT Indicator
Water Traps
Below Left Seat
In-Line Connectors at Wing Root
Figure 3: Component Locations
Aircraft with Pitot Heat Installed
(Optional Installation)
Connector
DA20-C1 AMM
Navigation
Doc # DA 201-C1
Rev. 7 34-10-00 Page 101
09 Aug 2001
TROUBLE-SHOOTING
1. GENERAL
A. Pitot-Static And OAT Systems
Use the data below to trouble-shoot the pitot-static and OAT systems.
Complaint Possible Cause Remedy
Altimeter lags or reads
incorrectly.
VSI reads incorrectly.
Faulty instrument.
Blocked or kinked static pipe.
Water in the system.
Replace the instrument.
Clear the pipe.
Drain the water.
Airspeed indicator reads low. Faulty instrument.
Blocked or kinked pitot pipe.
Water in the system.
Replace the instrument.
Clear the pipe.
Drain the water.
Pitot heat does not operate. PITOT HEAT circuit-breaker
open. PITOT HEAT circuitbreaker
defective.
High thermal limit switch opencircuit
Low thermal limit switch opencircuit
(automatic reset
defective)
Pitot heat wiring open-circuit.
Pitot probe defective.
Close the circuit-breaker. If
the circuit breaker opens
again, do a test for a shortcircuit
in the pitot heat wiring.
Replace the circuit-breaker
Reset high thermal switch
(located within the inspection
panel under wing at the pitot
static probe.
Replace low thermal switch.
Do a continuity test of the
wiring. Repair or replace
defective wiring.
Replace the pitot probe.
OAT indicator gives incorrect
indication.
Faulty indicator. Replace the indicator and
sensor.
OAT indicator gives no
indication
OAT circuit-breaker open or
defective
Defective power supply cable.
Close the circuit-breaker. Or
Replace the circuit breaker
Repair the cable
Navigation
DA20-C1 AMM
Page 102
19 Dec 1997 34-10-00 Doc # DA 201-C1
Rev. 0
B. Blind Encoder (Mode C Fault Analysis)
(1) Let the encoder warm-up. (The encoder can take between 4 and 45 minutes to warm-up).
Note: Use a transponder test set for altitude read-out. Or:
If a KLN 35A or KLX 135/135A is installed, read the altitude read-out from the
encoder on the GPS display.
(2) Use a pitot static tester to give the altitude where the transponder is not operating.
　
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