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Doc # 6.02.01 Page 203
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AMM
% 4. Test the Transponder
% Use a transponder test set to make sure that the system operates correctly. %
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DA 40 Series
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).
Page 204 Doc # 6.02.01 09 Jan 2003 Rev. 4
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Navigation
AMM
% 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. % %
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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.
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