6. System Test - ATC System - Using Instrument Flight Research ATC - 601
A. General
(1)
The system test is a more complete check of the ATC system. The system test first does the ATC Operational Test. Then it uses a ramp test set to examine the left and the right ATC system.
(2)
This system test satisfies the requirements in FAR 91.413 appendix F of part 43, which calls for the periodical check of the ATC transponder, without removing the transponder from the airplane.
B. Standard Tools and Equipment
(1)
Transponder Test Set, IFR Model ATC-601
(2)
Air Data Test set, Castleberry AT700-2, Castleberry Instr & Avionics, Austin, TX; or equivalent
C. References
(1) AMM 34-11-0/501, Pitot Static System
D. Prepare for the System Test
NOTE: The test set is a source of interference for radio and L-band radar equipment. Turn the test set off as soon as the test is completed or when other nearby airplanes do radio checks.
CAUTION: DO NOT PLACE THE REMOTE TEST SET ANTENNA CLOSER THAN 15 INCHES (.40 METERS) TO THE AIRCRAFT ANTENNA WITH THE TEST SET ON. THIS WILL CAUSE DAMAGE TO THE TEST SET.
(1)
Put the remote test set antenna between 6 and 300 feet (2 and 90 meters) from the ATC antenna for the related system.
(2)
Put the test set antenna in position towards the aircraft antenna.
(3)
Connect the coax cable from the remote test set antenna to the test set.
(4)
Set the PWR switch on the test set to the ON position.
NOTE: The test set is a source of interference for radio and L-band radar equipment operating on the airplane and located near the test set. Turn the test set off as soon as the test is completed or when you must perform other radio checks on the airplane.
(5)
Push the SET UP key to enter the SET UP menu.
NOTE: For information about the battery test, timing and recharging refer to the operation section of the test set operators manual.
(6)
Enter the HEIGHT and RANGE (in feet) of the ATC antenna.
(a)
Use the slew keys to change the values.
(b)
Use the select keys to change the items.
(7)
Enter the gain listed on the test set antenna into the GAIN_1030 and GAIN_1090 field.
(8)
Enter the cable loss listed on the cable in the LOSS field.
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E. Test ATC system
CAUTION: DO NOT USE CODES 7500,7600-7677, OR 7700-7777. THESE ARE EMERGENCY CODES.
(1)
Set the switches on ATC control panel as follows:
(a)
Transponder Select -Applicable system
(b)
Altitude Reporting - OFF
(c)
Code Select - 0000
(2)
Do the ATC system Operational Test
(3)
Push the AUTO TEST key on the test set.
(a) Make sure the results of the last auto test are shown.
F. Reply Frequency Test
(1)
Do a check of the Reply Frequency.
(a) Make sure the reply frequency of the transponder is 1090 MHz 士3 MHz.
(2)
Do a check of the Reply Delay.
(a) Make sure the reply delay is 3.00 Ms (士0.50 Ms) for ATCRBS mode.
(3)
Do a check of the Reply Jitter.
(a)
Make sure the reply jitter is < 0.06 Ms for all call.
(b)
Make sure the reply jitter is < 0.1 Ms for ATCRBS modes,
(4)
Do a check of the ATCRBS Reply.
(a)
Make sure the spacing of the F1 to F2 pulse is 20.3 Ms (士0.10 Ms).
(b)
Make sure the duration of the F1 F2 pulse is 0.45 Ms (士0.10 Ms).
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G. Suppression Test
(1) Do a check of the Side Lobe Suppression (SLS).
(a) Make sure the reply is received when the SLS pulse is -9 dB and no reply is received when the SLS pulse is 0 dB.
NOTE: Run the SLS Ievel test in less than 95 feet (28.96 meters) of the UUT antenna.
H. Sensitivity Test
(1)
Do a check of the Minimum Triggering Level (MTL) Difference.
(a) Make sure the Minimum Triggering Level (MTL) difference between mode A and mode C is < 1.0 dBm
(2)
Do a check of the Minimum Triggering Level (MTL).
(a) Make sure the Minimum Triggering Level (MTL) is -73 dBm (士4 dBm).
I. Peak Output Power Test
(1) Do a check of the Peak Output Power.
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