CONTROL/ FUNCTION
INDICATOR

IFF  Causes the transponder to reply with code 7700 (emergency) in mode 3/A.
HOLD  Retains mode 4 code setting when power is removed from the transponder.
3.11.2 Modes of Operation.
3.11.2.1 Zeroize Mode. This mode provides centralized zeroization control for all secure information, including crypto codes, KIT-1C codes, .ight plans and communica-tions presets contained in AMS and the Data Transfer Sys-tem, GPS almanac, and all information in DTS cartridge. After zeroizing, all radio settings may change and should be checked.
3.11.2.2 Emergency Comm Mode. This mode acti-vates the AN/ARC-222 standby control panel, and tunes the AN/ARC-164 radio to 243.0 MHz. When this occurs, all radio settings in the AMS CDU may be changed and should be checked when EMERG COMM is placed in NORM.
3-44 Change 3
Section III NAVIGATION
3.12 AREA NAVIGATION SYSTEM.
The area navigation system in the AMS receives inputs from navigation sensors and relates the helicopter’s posi-tion to waypoints in .ight plans to arrive at an output to the command instrument system and the navigation display (VSI and HSI, and the multifunction display) on the instru-ment panel. Area navigation maps, showing the .ight plan waypoints and desired track between them, may be dis-played on the MFD, while precise navigational guidance similar to VOR or ILS tracking is displayed on the VSI and HSI. Both horizontal and vertical navigation guidance is provided.
3.12.1 Flight Plans.
a.
Three pilot de.ned .ight plans are available in the AMS. Direct .ight plans guide the helicopter in 9direct to9 .ights, from any present position to a distant waypoint. Two other .ight plans, labeled 1 and 2 are available.

b.
Flight plans are an ordered series of waypoints. Each .ight plan may contain up to 98 waypoints, which may be in any reference number sequence. Waypoints may also be repeated in a .ight plan. Flight plan control screens are used to access, review and modify .ight plans and way-points.

3.12.1.1 Activating, Or Reactivating a Flight Plan.
When the ENGAGE soft key is pressed on a .ight plan for the .rst time, the .rst waypoint listed is made the TO way-point, and the helicopter’s present position becomes a phantom FROM waypoint. If the .ight plan is partly navi-gated, and then left, it is suspended with the current TO waypoint remembered as the resume point. When the .ight plan is re engaged it will navigate to the remembered TO waypoint. The helicopter’s present position again becomes a phantom FROM waypoint, creating a leg that goes to the resume point of the .ight plan.
3.12.1.2 Leg Sequencing. Leg sequencing in a .ight plan may be automatic or manual. When manual sequenc-ing is selected, arrival at the TO waypoint causes the header to display WPT on the status line and will .ash the WPT or MOB label on the navigation header. The pilot must then press NXT key to sequence to the next leg. When automatic sequencing is selected, the WPT warning will .ash for only a second prior to sequencing to the next leg. In the automatic mode, the exact time of leg sequencing changes with the selection of leg switching. When EARLY is selected, the helicopter will be guided to start the turn prior to the waypoint. For legs with course changes less than 120°, a standard rate turn will result in a roll out on the outbound course. When course changes direction greater than 120°, the turn will result in a teardrop pattern.
3.12.1.3 Flight Plan Sequencing. Flight plan legs may be advanced, re .own or skipped at the pilot’s discre-tion. The RVRS soft key causes the .ight plan sequence to reverse course, .ying the helicopter back along the same route that it came. When this soft key is pressed, the dis-played list is also changed to re.ect the new routing. The GO TO function will give direction from the helicopter’s present position to the designated TO waypoint, and con-tinue sequencing from there through the balance of the .ight plan. This allows the pilot to enter the .ight plan from any position to any waypoint in the sequence.
　
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