Normal Operation

Table 3-23. RT-1296/APX-100(V)1(IFF) and RT-1557/APX-100(V)1(IFF) Control and Indicator Functions continued

TM-1-1520-238-10 Helicopter Attack AH-64A Apache Manual
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TM 1-1520-238-10 Change 8 3-69 2. MODES 1 and/or 3A code selector buttons – Press and release until desired code shows. 3. TEST, TEST/MON, and REPLY indicators – PRESS-TO-TEST. NOTE Do not make any checks: (1) near a radar site; (2) with MASTER control switch in EMER, or (3) with M-3/A codes 7600 or 7700 without first obtaining authorization from the interrogating stations. 4. If MODE 1, M-2, M-3/A, 0r M-C is to be used, check as follows: a. MASTER control switch – NORM. b. ANT selector switch – TOP. c. M-1 switch – Hold at TEST. Observe that TEST GO indicators are on. d. M-1 switch – Return to ON. If MODE 2, 3/A, or C are to be used, check as follows: (1) M-2, M-3/A, and M-C switches – Repeat steps (4c) and (4d). e. ANT switch – BOT. f. Repeat steps (4c) through (4d(1). g. ANT selector switch – DIV. h. Repeat steps (4c) through (4d(1). NOTE This procedure utilizes bit to perform a self- test on the AN/APX-100 IFF. Because bit cannot test the KIT-1A/TSEC, this test will only verify the operational readiness of the IFF in MODES 1, 2, 3/A and C. 5. If MODE 4 is to be used, check as follows: a. MODE 4 CODE selector switch – position A. b. MODE 4 AUDIO/LIGHT/OUT switch – OUT. c. MODE 4 TEST/ON/OUT switch – TEST. Ob- serve that TEST GO indicator lights and MODE 4 REPLY indicator does not light. d. MODE 4 TEST/ON/OUT switch – ON. NOTE When possible, request permission from in- terrogating station to activate radar test mode. 6. RAD TEST switch – RAD TEST and hold. 7. RAD TEST switch – Return to OUT. 8. Verify from interrogating station that TEST MODE reply was received. 3.17.4 Normal Operation. Completion of the starting procedure leaves the APX-100(V) in operation. The fol- lowing steps may be required, depending upon mission. CAUTION Due to possible operating problems of the (IFF), usage of the UHF radio on fre- quency ranges 341.325 thru 345.325 is prohibited while operating the IFF in MODE 4. a. Normal Mode. 1. MODE 4 CODE selector switch – A or B as re- quired. a. If MODE 4 code retention is desired, after landing and before turning the MASTER control switch OFF or helicopter power off, place the MODE 4 CODE selector switch to HOLD and release. Allow approximately 15 seconds for the HOLD function to operate before turning the MASTER control switch OFF or helicopter power off. b. If MODE 4 code retention is not desired, ei- ther place the MODE 4 CODE selector switch to ZERO or with the helicopter on the ground turn the MASTER control switch OFF. For both methods zeroizing is immedi- ate.

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