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a. If range and coordinates are considered 2. Ensure the navigation system is accurate.
acceptable, CONFIRM key  Press.
3. Helicopter  Position at a hover at least 3
b. If range and coordinates are not acceptable, km from target being used with the target
REJECT key  Press. Repeat steps 4 visible in the MMS.
through 9.
4. MMS mode select switch  PREFLT.
10. LASER ARM/STBY/OFF switch  As desired.
5. SETUP key  Press.
NOTE
6. AIRBORNE CAL key  Press to display the
• Offset update mode must be exited prior AIRBORNE CALIBRATION page (fig. 4-18).
to using flyover update.
7. CLEAR key  Press as required to eliminate
• If NAV update fail message appears and existing airborne cal values.
flyover update is desired, exit offset
update mode by pressing MMS mode key. 8. STORE key  Press as required.
4-32. AIRBORNE CALIBRATION. 9. TV or TIS narrow field-of-view  Select and
point track the target.
Airborne calibration (airborne cal) is a flight calibration
required to correct pointing errors in EGI, TAMS, and 10. Target  Position helicopter to put target
MMS subsystems. I t s function is to compare greater than 90° to the right of helicopter.
commanded and actual LOS angles and compute error
terms that are used during PREPOINT, TARGET 11. TGT RIGHT key  Press.
LOCATE, OFFSET UPDATE, and MFD weapons
engagement.
12. Target  Perform a right pedal turn at no
A valid airborne calibration is essential for maintaining more than 5° per second to position
the required accuracy on the weapons steering cue helicopter to put target greater than 90° to the
present on the pilots MFD. It is especially critical during left of helicopter.
ATAS engagements where the steering cue and the
ATAS seeker box must be overlapped for seeker 13. TGT LEFT  Press.
acquisition of the target. HMS is also critical in that the
HELLFIRE seeker cue and MMS LOS must be 14. STORE key  Press to load these values in
coincident for constraints to be met. nonvolatile memory.
The following describes the airborne calibration
procedure including a means to evaluate the validity of 15. MMS mode select switch  PREPT. Prepoint
the correction factors. the target with wide field of view selected and
4-37
TM 1-1520-248-10
2. SETUP key  Press.
verify airborne cal accuracy by verifying that
the target is within narrow field of view area.
3. MDC key  Press to ON.
NOTE
CAUTION
• Failures of airborne cal are usually very
obvious. When step 15 is completed and Ten to 200 seconds can be used and the
the target is not even close, sequence longer sample will provide more accurate
through the flight plan back to correct data. During the sampling period, the
target and repeat airborne cal beginning MMS LOS will continue to drift. Do not
at step 3. allow MMS to contact stops.
• If step 15 reveals the target is close but
4. MDC key  Press to OFF.
not within narrow FOV or if an azimuth
error exists but elevation is good, an EGI
heading error could be the cause. In this 5. MMS mode select switch  FWD.
event, repeat the entire airborne cal
beginning at step 1. 6. MNL/SLAV switch  Press as necessary to
enter FWD mode.
4-33. MANUAL DRIFT COMPENSATION.
7. MNL/SLAV switch  Press to enter manual
track mode.
1. MMS mode select switch  PREFLT.
8. LOS drift  Check. If the drift had not been
corrected, call maintenance.
4-38
TM 1-1520-248-10
PULL
MAN
PULL
BKUP
BRT
C
ONT
VSD HSD MMS COMM
6
5
2
1
3
4
AIRBORNE CALIBRATION
PP
TGT
STORE
TGT LEFT
COMPLETE
PM-7234-3073
PM-7234-2573
CLEAR
TGT RIGHT
406075-1529
J1336
CONTROL/INDICATOR FUNCTION
1. TGT RIGHT key Initiates calibration with target to right of helicopter.
2. CLEAR key Sets the default values for the airborne calibration into memory replacing
any previous values stored.
3. STORE key Stores the calibration value into non-volatile memory.
4. TGT LEFT key Initiates calibration with target to left of helicopter.
5. TGT key Key has no function. Displays coordinates of airborne calibration location.
6. PP key Key has no function. Legend displays present position.
Figure 4-18. AIRBORNE CALIBRATION Page
4-39
TM 1-1520-248-10
4-34. AIRBORNE VIDEO TAPE RECORDER. 1. MMS  Place in any operational mode.
The Airborne Video Tape Recorder (AVTR) is a video NOTE
　
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