TM 1–1520–238–T–3Change 48–2278–858 SIGNAL NAME:P4M1 TYPE (ACY) P4M1 MSL TYPE (ACZ)MEMORY LOCATION: 002050MEMORY DATA BIT(S):7–8(BINARY)CONDITION:If fourth digit displayed on HOD is 0, 1, 2, or 3=TRAININGIf fifth digit displayed on HOD 1, 3, 5, or 7=TACTICALIf fifth digit displayed on HOD 1, 3, 5, or 7 and fourth digit displayed on HOD is 0, 1, 2,or 3=NONESIGNAL FUNCTION:Indicates a tactical, training or no missile at location.REMARKS: From launcher through right outboard MRTU Type II to FCC.PASS:If CONDITION corresponds to installed type of missiles, refer to failure symptom index andnext failure symptom paragraph.FAIL: Location of fault: right outboard launcher, wiring from right outboard launcher to right outboardMRTU Type II, right outboard MRTU Type II. Troubleshoot wiring to isolate fault(TM 9–1427–475–20).8–859 SIGNAL NAME:P4M1 MSL DEICE #1 CMDMEMORY LOCATION: 001305MEMORY DATA BIT(S):5(BINARY)CONDITION:(None)SIGNAL FUNCTION:Sends command to launcher ECSP to arm deicing squib.REMARKS: From RHE to ECSP.PASS:If fifth digit on HOD is 4, 5, 6, or 7, go to paragraph 8–860.FAIL: Location of fault: RHE, wiring from RHE to ECSP, ECSP. Troubleshoot wiring to isolate fault(TM 9–1427–475–20).8–860 SIGNAL NAME:P4M1 MSL DEICE #1 CMDMEMORY LOCATION: 002067MEMORY DATA BIT(S):5(BINARY)CONDITION:(None)SIGNAL FUNCTION:Sends command to launcher ECSP to arm deicing squib.REMARKS: From launcher through right outboard MRTU Type II to FCC.PASS:If fifth digit on HOD is 4, 5, 6, or 7, go to paragraph 8–891.FAIL: Location of fault: right outboard launcher, wiring from right outboard launcher to right outboardMRTU Type II, right outboard MRTU Type II. Troubleshoot wiring to isolate fault(TM 9–1427–475–20).
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