TM 1–1520–238–T–3
Change 4
5–13
5–41 SIGNAL NAME:
SINE AZ TO GUN (ACY) GUN SINE AZ CMD (ACZ)
MEMORY LOCATION: 001645
MEMORY DATA BIT(S):
4–19 (ACY) 4–15 (ACZ)
(SCALAR)
CONDITION:
Monitor HOD while slewing gun: memory location response should indicate a negative
(sixth digit on the HOD is 1) when the sine azimuth is to the left and a positive (sixth
digit on HOD is 0) when sine azimuth is to the right.
SIGNAL FUNCTION:
Issues LOS azimuth signal (– left/+ right) to gun.
REMARKS: From FCC through RH FAB MRTU Type I to GTCB.
PASS:
If polarity of scalar conversion corresponds to gun position, go to paragraph 5–42.
FAIL: Location of fault: refer to sight selected LOS (TADS, PNVS or HMD).
5–42 SIGNAL NAME:
COSINE AZ TO GUN (ACY) GUN COS AZ CMD (ACZ)
MEMORY LOCATION: 001646
MEMORY DATA BIT(S):
4–19 (ACY) 4–15 (ACZ)
(SCALAR)
CONDITION:
Monitor HOD while slewing gun: memory location response should indicate a negative
(sixth digit on the HOD is 1) when the cosine azimuth is to the left and a positive (sixth
digit on HOD is 0) when cosine azimuth is to the right.
SIGNAL FUNCTION:
Issues LOS azimuth signal (– left/+ right) to gun.
REMARKS: From FCC through RH FAB MRTU Type I to GTCB.
PASS:
If CONDITION corresponds to gun position, go to paragraph 5–43.
FAIL: Location of fault: refer to sight selected LOS (TADS, PNVS or HMD).
5–43 SIGNAL NAME:
EL LEAD TO GUN (ACY) GUN EL LEAD CMD (ACZ)
MEMORY LOCATION: 001602
MEMORY DATA BIT(S):
4–19 (ACY) 4–15 (ACZ)
(SCALAR)
CONDITION:
Monitor HOD while slewing gun: memory location response should indicate a negative
(sixth digit on the HOD is 1) when the elevation lead angle error is down and a positive
(sixth digit on HOD is 0) when elevation lead angle error is up.
SIGNAL FUNCTION:
Issues elevation lead angle error signal (– down/+ up) to GTCB.
REMARKS: From FCC through RH FAB MRTU Type I to GTCB.
PASS:
If CONDITION corresponds to gun position, go to paragraph 5–44.
FAIL: Location of fault: refer to sight selected LOS (TADS, PNVS or HMD).
5–44 SIGNAL NAME:
GUN EL ERROR
MEMORY LOCATION: 001542
MEMORY DATA BIT(S):
4–19 (ACY) 4–15 (ACZ)
(SCALAR)
CONDITION:
Monitor HOD while slewing gun: memory location response should indicate a negative
(sixth digit on the HOD is 1) when the elevation lead angle error is down and a positive
(sixth digit on HOD is 0) when elevation lead angle error is up.
SIGNAL FUNCTION:
Issues elevation error signal (– down/+ up) to FCC.
REMARKS: From GTCB through RH FAB MRTU Type I to FCC.
PASS:
If CONDITION corresponds to gun position, go to paragraph 5–45.
FAIL: Location of fault: refer to sight selected LOS (TADS, PNVS or HMD).
