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(2) Remove the instrument panel cover. Refer to Section 25-10.
(3) Disconnect the static hose from the encoder. Put a cap on the static hose!
(4) Disconnect the electrical connector(s).
(5) Release the knurled mounting screw for the
encoder.
(6) Remove the encoder. Remove the SAE5-35 from the
mounting rack.
(7) Install a cover over the static port.
B. Install the Blind Altitude Encoder
Detail Steps/Work Items Key Items/References
(1) Remove the cover from the static port on the
encoder.
(2) If you install a new encoder, install the static
fitting from the old encoder on the new encoder.
(3) Put the encoder in position on the mounting.
Install the knurled mounting screw.
Slide the SAE5-35 in the mounting rack.
(4) Connect the electrical connector(s).
(5) Connect the static hose to the encoder.
(6) Close the XPDR circuit-breaker.
(7) Do a low-range static leak check. Refer to Section 34-10.
(8) Do the adjustment/test procedure. Refer to Paragraph 5.
(9) Install the instrument panel cover. Refer to Section 25-10.
AIRCRAFT
Navigation
DA 40 Series
AMM
Page 204
20 Sep 2007 34-56-00 Doc # 6.02.01
Rev. 5
4. Test the Transponder
Use a transponder test set to make sure that the system operates correctly.
Detail Steps/Work Items Key Items/References or
Limit Values
(1) Connect the test equipment. Refer to the equipment manufacturers'
manuals.
(2) Measure TX power. 125 W to 500 W
(3) Measure MTL mode A. -69 dBm to -77 dBm
(4) Measure MTL mode C. -69 dBm to -77 dBm
(5) Determine MTL A & C difference. max. 1 dB
(6) Measure SLS P2 P1. less than 1 % reply
(7) Measure SLS P2 -9 dB < P1. more than 90 % reply
(8) Measure 'ident' time. 15 sec to 30 sec
(9) Measure interrogation mode A
retard/advance P3.
less than 10 % at max. 1.0 μs
(10) Measure interrogation mode C
retard/advance P3.
less than 10 % at max. 1.0 μs
(11) Measure framing:
S retard/advance (F2 light just on)
S difference between F2 retard and advance
S calculate center of F2
0.45 ± 0.07 μs
max. ± 0.1 μs. from 0
(12) Check if 'reply' indicator and dimer are o.k.
(13) Check if mode A coding is o.k.
(14) Measure transmitter frequency deviation (from
1090 MHz).
± 1.5 MHz
(15) If necessary, do a test of the blind altitude
encoder.
Refer to Paragraph 5.
(16) Dis-connect the test equipment.
(17) Do an operation flight test::
S Do a test of each control function.
S Contact ATC, ask for a transponder check.
Refer to this Section.
Note warm-up period of blind encoding
altimeter (see Paragraph 5).
AIRCRAFT
DA 40 Series
AMM
Navigation
Doc # 6.02.01
Rev. 5 34-56-00 Page 205
20 Sep 2007
5. Adjust/Test the Blind Altitude Encoder
A. Adjust/Test the D120-P2-T
The encoder will not give an output until it has reached the correct operating temperature. If the
power goes off and then on again, a delay of 6 minutes occurs. The approximate warm-up times
are:
) From 70 °F (21 °C) 4 to 6 minutes.
) From 0 °F (-18 °C) up to 10 minutes.
) From -55 °F (-48 °C) 30 to 45 minutes.
The adjusters are next to the static port on the encoder. The LO adjuster is towards the outside.
The HI adjuster is towards the center.
Detail Steps/Work Items Key Items/References
(1) Connect the test equipment. Refer to the equipment manufacturers'
manuals.
(2) Set the airplane altimeter to 1013.25 hPa
(29.92 inHg).
(3) Monitor the altitude code. Decrease the pressure
until the output code just changes to 20,000 ft.
(4) Make sure that the altimeter reading is within
± 125 ft of the encoder reading. If not, adjust the
HI adjuster until the change occurs within 30 ft of
the altimeter reading.
Lightly tap the panel next to the
altimeter to prevent errors due to
friction.
(5) Increase the pressure until the output code just
changes to 0 ft.
(6) Make sure that the altimeter reading is within
± 125 ft of the encoder reading. If not, adjust the
LO adjuster until the change occurs within 30 ft.
of the altimeter reading.
Lightly tap the panel next to the
altimeter to prevent errors due to
friction.
(7) Do steps 2 to 5 again until both 20,000 ft and 0 ft.
values are within the ± 125 ft tolerance.
(8) Operate the system through the range -1000 ft to
20,000 ft. Make sure that the altimeter and the
encoder are within the ± 125 ft tolerance.
Lightly tap the panel next to the
　
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