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Operating Transition to Hover

Mar 14, 2018
By: Jason Mason, Senior Engineer, Technical Sales

FMS/MMMS software version SCN 1002.0/1102.0 is now FAA TSO authorized. Helicopter operators can take advantage of LP Level of Service (LOS) approaches and a new Transition to Hover (TTH) search pattern.

When enabled, the TTH function supports transitioning a helicopter from its present position to a top of descent point at which the helicopter can begin a transition down to a hover. The TTH function supports a generic helicopter platform, as well as the AS332 helicopter with the CDV-155 flight director/coupler computer.

TRANS TO HOVER

The following are features on the TRANS TO HOVER FMS/MMMS Page:

Tranisition to Hover
  1. WIND – Displays the FMS filtered wind direction and magnitude based on the MAG/TRUE Heading Reference Selection.
  2. INBD CRS [2L] – Displays the inbound course to target based on the MAG/TRUE Heading Reference Selection. The FMS filtered wind direction is automatic or manually entered with a range of 0 to 360 degrees.
  3. RAD ALT [3L] – Displays the Radar Altitude height in feet. Manually enter RAD ALT data with a range of 0 to 9,999 feet.
  4. HVR HT [4L] – Displays the selected hover height in feet (if configured with a CDV-155 flight director/coupler computer). Manually enter HVR HT data with a range of 0 to 999 feet.
  5. TGT [1R] – Displays the selected target information based on Mark- On-Target (MOT), Navigation waypoint or Pilot defined waypoint. Time and date stamp only display for MOT fixes. Selection of TGT, LSK [1R] allows for target fix selection. The LIST function also enters a target fix. The TGT data will automatically update whenever creating a new MOT waypoint.
  6. Pattern [3R] – Displays the selected pattern type. When selected, the available options are: Left, Right or Auto. The AUTO (L or R) predicted pattern type bases on the current selected settings on the TTH page and the present position of the helicopter.
  7. HAV DIST [4R] – Displays the selected hover distance (the distance to go to the target after the TTH maneuver ends) in feet. The default configures at installation and manually updates with a range of 0 to 9,999 feet.

TTH Pattern

The following are features on the TTH PATTERN Page:

Transition to Hover Pattern
  1. LEFT [1R] – Sets the selected pattern type to LEFT.
  2. RIGHT [2R] – Sets the selected pattern type to RIGHT.
  3. AUTO [3R] – Allows the FMS to automatically determine the pattern type (left or right).

Activate TTH

To activate TTH, take the following steps:

  1. Press [NAV] to access the Nav Pages.
  2. Press [MENU] to access the Nav Menu Page.
  3. Press TRANS HOVER, LSK [1L] to access the TRANS TO HOVER Page.
  4. If necessary, press the adjacent LSK to the INBD CRS, RAD ALT, HVR HT, PATTERN, or HVR DIST fields for manual entry of data into the respective field.
  5. With TGT, LSK [1R] active, enter the target fix.
  6. Press ACTIVATE, LSK [5L] to activate the TTH and display the Navigation page.

You can also access the TTH page from any page by pressing the MOT button if you configure the TTH page jump option.

You can also access the TTH page from any page by pressing the MOT button if you configure the TTH page jump option.

TTH cancels when any of the following functions perform:

  • DTO
  • PVOR
  • Manual Leg Change
  • Holding Pattern
  • Search Pattern

Additional Information

For more information, please contact your Universal Avionics Regional Sales Manager.

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