(9)
Open ATC and altitude source circuit breakers if no longer required.
(10)
Remove electrical power if no longer required (AMM 24-22-00).
4. System Test - ATC System (Using TEL-Instruments T-33B Test Set)
________________________
A. General
(1) The system test is a complete system checkout of the ATC. The first part of the system test consists of the performance of all tests possible using only the built-in test capability of the equipment installed in the airplane (operational test). The balance of the system test requires the use of an ATC ramp test set.
B. Equipment amd Materials
(1)
ATC Transponder Ramp Test Set - TEL-INSTRUMENTS CORP. T-33B
(2)
Pitot Static Test Kit
C. Referenced Procedures
(1)
AMM 34-11-00, Adjustment/Test
(2)
AMM 34-12-00, Adjustment/Test
(3)
AMM 34-53-00, Adjustment/Test (Operational Test)
(4)
AMM 34-53-03, Removal/Installation
D. Test ATC System Using T-33B Test Set
(1)
Perform ATC system operational test provided in AMM 34-53-00, ATC System - Adjustment/Test.
(2)
Prepare to Test ATC System
NOTE: Steps (2)(a) thru (3)(h) are to be performed for receiver
____ sensitivity checks. Otherwise, perform steps (3)(i) thru (4).
(a)
Remove appropriate ATC antenna (AMM 34-53-03).
(b)
Using a T-33B tester ONLY, connect antenna end of transmission line to tester as follows:
EFFECTIVITY AF ALI ALL; DLH ALL; IBE ALL;
AF SAB ALL; AF, AT,MD, GN, AF AND VM WITHOUT AEB 34-587 CONFIG 1 AF AND 34-607 02 A Page 504
Oct 25/96
34-53-00
1) Connect six foot test cable to BNC jack on tester.
CAUTION: NEVER CONNECT TEST CABLE TO TNC CONNECTOR ON
_______ TESTER AS TESTER WILL BE DAMAGED. ALSO, ANTENNA (IN COVER) MUST BE DISCONNECTED FROM TNC JACK AND PROTECTOR CAP MUST BE INSTALLED ON THIS TNC CONNECTOR TO PREVENT RADIATION OF SIGNALS.
2) Using proper between-series adapter, connect other end of test cable to ATC antenna transmission line.
(c)
Position test set controls as follows:
RCVR SENS - 65 1090 MHz - Zero REPLY/SLS - 100% MODE - 3/A READOUT - PILOT
(d)
Turn on test set. Ascertain BATTERY CHECK meter is in white portion of scale. If not, recharge battery from a 115V AC 50-400 Hz source.
NOTE: It is permissable to operate test set while battery is
____ being charged.
(3) Test ATC System
(a)
Close following circuit breakers: 1) ATC-1 P7 panel 2) ATC-2 P7 panel 3) Altitude Source (ALTIMETER or CADC)
(b)
Activate ATC system to be tested in Mode A with ALT RPTG/REPORT off and code 0000 selected.
(c)
On test set, adjust RCVR SENS control for a meter reading of 90%. Sensitivity as read on test set dial must be -73 |4 DBM.
(d)
Select ALT RPTG/REPORT on cockpit ATC control unit and MODE C on test set.
(e)
Repeat step (c). Sensitivity must be within 1 DB of MODE A sensitivity.
(f)
Disconnect test set.
(g)
Connect and reinstall ATC antenna (Ref 34-53-03).
(h)
Repeat steps (2)(a) thru (3)(g) for the alternate ATC system (if installed/required).
NOTE: Following tests will suffice for all but receiver
____ sensitivity tests (Refer to NOTE preceding step D (2)).
(i) Perform steps (3)(a) and (3)(b).
EFFECTIVITY AF ALI ALL; DLH ALL; IBE ALL;
AF SAB ALL; AF, AT,MD, GN, AF AND VM WITHOUT AEB 34-587 CONFIG 1 AF AND 34-607 02 A Page 505
Oct 25/96
34-53-00
(j) Position controls on test set as follows:
RCVR SENS - 65 REPLY/SLS - LEVEL 1090 MHz - 0 MODE - 3/A Power - ON
Check test set meter deflects full scale readouts display FR1
and FR2 indicating a reply from the transponder.
(k)
On ATC control panel, rotate code selector knobs to any code desired. Verify test set numerical display indicates selected code.
CAUTION:_______DO NOT USE CODES 7500, 7600, 7700. THESE ARE EMERGENCY CODES.
(l)
On ATC control panel, activate IDENT. A decimal point should appear in test set display.
NOTE: If correct indications do not appear, it may be
____ necessary to change position of test set to achieve sufficient signal strength. To assure that the test set antenna is coupling to the transponder antenna, the 1090 MHz control can be adjusted + or - from zero to adjust test set frequency to transponder frequency. Limit of adjustment is |6 MHz.
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