3.21.3 Operation.
3.21.3.1 Starting Procedure.
When .ying in a combat situation near friendly radar sites or in the vicinity of friendly .ghter aircraft, the MODE 4 monitor switch must be in either the AU-DIO or LIGHT position. This will enable the pilot to observe that the IFF is peri-odically responding to expected MODE 4 interrogations.
If the MODE 2 code has not been set previously, loosen two screws which hold MODE 2 numeral cover, and slide this cover upward to expose numerals of MODE 2 code switches (Figure 3-33). Set these switches to code assigned to helicopter. Slide numeral cover down and tighten screws.
1.
MASTER switch -STBY. NO-GO light should be on.
2.
Allow 2 minutes for warmup.
3.
MODES 1 and 3A CODE selector buttons -Press and release until desired code shows.
4.
TEST, TEST/MON, and REPLY indicators -PRESS-TO-TEST.If MODE 1 is to be used, check as follows:
5.
ANT switch -DIV.
6.
MASTER switch -NORM.
7.
M-1 switch -Hold at TEST, observe that only TEST GO indicator is on.
8.
M-1 switch -Return to ON. If modes 2, 3A or M-C are to be used, check as follows:
9.
M-2, M-3/A and M-C switches -Repeat steps
7. and 8.
Change 4 3-93 NOTE
Do not make any checks near a radar site or with MASTER control switch in EMER, nor with M-3/A codes 7500, 7600 or 7700, without .rst obtaining authorization from the interrogating station(s) within range of the transponder.
The following steps can be done only with KIT/1A computer transponder installed.
10. MODE 4 CODE switch -A.
a.
Set assigned test code in the KIT/1A com-puter transponder.
b.
AUDIO-ON-OUT switch -OUT.
c.
MODE 4 TEST-ON-OUT switch -Place to TEST and hold, then release.
d.
TEST GO light -ON, MODE 4 REPLY light off, KIT STATUS light off.
11. When possible, request cooperation from inter-rogating station to activate radar TEST mode.
a.
Verify from interrogating station that MODE TEST reply was received.
b.
RAD TEST switch -RAD TEST and hold.
c.
Verify from interrogating station that TEST MODE reply was received.
3.21.3.2 Normal Procedures. Completion of the start-ing procedure leaves the AN/APX-100(V) in operation. The following steps may be required, depending upon mission.
1. MODE 4 CODE selector switch -A or B as required.
a.
If code retention is desired, momentarily place the MODE 4 CODE selector switch to HOLD prior to turning the MASTER switch OFF.
b.
If code retention in external computer is not desired during transponder off mode, place MODE 4 CODE selector switch to ZERO to dump external computer code setting.
2.
Mode M-1, M-2, M-3/A, M-C,or MODE 4 switches -Select desired mode.
3.
Identi.cation of position (I/P) switch -IDENT, when required, to transmit identi.cation of po-sition pulses.
3.21.3.3 Emergency Operation.
NOTE
MASTER control switch must be lifted be-fore it can be switched to NORM or EMER.
During a helicopter emergency or distress condition the AN/APX-100(V) may be used to transmit specially coded emergency signals on mode 1, 2, 3/A and 4 to all interro-gating stations. Those emergency signals will be transmit-ted as long as the MASTER control switch on the control panel remains in EMER and the helicopter is interrogated. MASTER control switch -EMER. 中国航空网 www.aero.cn 航空翻译 www.aviation.cn 本文链接地址：UH-60Q 直升机技术手册 直升机操作手册 1(115)
