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and install nut which holds sensor in position.
(4) Use cable-ties to hold temperature sensor cable
in position in wiring harness.
(5) Close OAT circuit-breaker.
(6) Set ALT/BAT switch to ON. The OAT indicator must indicate the
ambient temperature ±1 °C or ±2 °F.
(7) Set ALT/BAT switch to OFF.
(8) Install instrument panel cover. Section 25-10.
C. Remove/Install the Davtron M803 Digital Chronometer with OAT Indication
Refer to Section 31-20.
AIRCRAFT
Navigation
DA 40 Series
AMM
Page 204
20 Sep 2007 34-10-00 Doc # 6.02.01
Rev. 5
5. Pitot and Static System Leak Tests
Always do a Pitot leak-test after you do maintenance on the Pitot system. And always do a low-range
static leak-test after you do maintenance on the static system.
CAUTION: OBEY THE FOLLOWING PRECAUTIONS WHEN YOU DO A PITOT OR
STATIC LEAK-TEST. IF YOU DO NOT OBEY THE PRECAUTIONS YOU
DAMAGE THE AIR DATA INSTRUMENTS.
A. Test Precautions
) The pressure in the Pitot system must always be equal to (or greater than) the pressure in the
static system.
) Reversal of the Pitot and static pipes can cause damage to the air data instruments.
) The applied pressure (and rate of change of pressure) must not be greater than the design limits
of the equipment which you will test.
) After doing the test, you must always return the system to its usual operating conditions.
B. Equipment
Item Quantity Part Number
Pitot-Static probe adaptor. 1 65797-07
Pitot-Static leak tester. 1 Commercial.
AIRCRAFT
DA 40 Series
AMM
Navigation
Doc # 6.02.01
Rev. 5 34-10-00 Page 205
20 Sep 2007
C. Low Range Static Leak Test
Follow the test equipment manufacturer's instructions for the use of the test-set. Obey the safety
precautions for Pitot-static leak-testing at all times!
Detail Steps/Work Items Key Items/References
(1) Connect the Pitot-static leak-tester to the Pitotstatic
probe.
(2) Apply a partial vacuum to the static port until you
get a pressure altitude of 1000 ft above the
ambient pressure altitude.
Note the altitude.
(3) Let the pressure stabilize.
% (4) Stop the Pitot-static leak-tester.
% (5) Monitor the system pressure. The system pressure loss must not be
more than 100 ft/min.
% (6) Compare the test equipment altimeter and the
airplane altimeter.
The indication error must be less than
shown in Table 1 below.
Table 1: Altimeter Indication Error
Altitude Allowable Error
Sea Level ±20 ft
4,000 ft ±35 ft
8,000 ft ±60 ft
12,000 ft ±90 ft
16,000 ft ±110 ft
20,000 ft ±130 ft
AIRCRAFT
Navigation
DA 40 Series
AMM
Page 206
20 Sep 2007 34-10-00 Doc # 6.02.01
Rev. 5
D. Pitot Test
Follow the test equipment manufacturers' instructions for the use of the test-set. Obey the safety
precautions for Pitot-static leak-testing at all times!
Detail Steps/Work Items Key Items/References
(1) Connect the Pitot-static leak-tester to the Pitotstatic
probe.
(2) Apply a pressure to the Pitot port equal to 150
kts.
(3) Let the pressure stabilize.
% (4) Stop the Pitot-static leak-tester.
% (5) Monitor the system pressure. The leak rate must not be more than 10
kts/min.
% (6) Compare the test-equipment ASI and the
airplane ASI.
The indication error must be less than
shown in table 2 below.
Table 2: ASI Indication Error
Airspeed Allowable Error
160 kts ±4 kts
100 kts ±4 kts
40 kts ±1.7 kts
AIRCRAFT
DA 40 Series
AMM
Navigation
Doc # 6.02.01
Rev. 5 34-20-00 Page 1
20 Sep 2007
Section 34-20
Attitude and Direction
1. General
This Section tells you about the equipment which shows attitude and flight direction.
Refer to these Sections for data about the systems:
Section 34-22 Magnetic compass.
Section 34-25 Integrated gyro instruments (turn & bank indicator, attitude gyro (artificial horizon),
directional gyro).
Section 34-28 Gyro-compass system, consisting of slaved directional gyro, magnetic azimuth
transmitter, slaving control unit, and horizontal situation indicator (HSI).
AIRCRAFT
Navigation
DA 40 Series
AMM
Page 2
20 Sep 2007 34-20-00 Doc # 6.02.01
Rev. 5
Intentionally left blank
AIRCRAFT
DA 40 Series
AMM
Navigation
Doc # 6.02.01
Rev. 5 34-22-00 Page 1
20 Sep 2007
Section 34-22
Magnetic Compass
1. General
This Section tells you about the magnetic compass which is used to show airplane direction. Refer to
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