How to - Radio Magnetic Indicator (RMI) Operation

[richboy2307]

The YS-11 is equipped with a dual-needle Radio Magnetic Indicator (RMI) on each side of the cockpit that is used as both a bearing and heading indicator.

RMI - Bearing Indicator

The two needles always indicate magnetic bearing to the selected beacon (VOR or NDB) provided there is an active signal. The tail of the needle indicates the reciprocal bearing.

You can configure the needles in a various number of ways using the Selector Knob positions as follows:

 

• Position #1 - The thin needle (single line) points to VOR1. The thick needle (double line) points to VOR2.
• Position #2 - The thin needle (single line) points to VOR1. The thick needle (double line) points to ADF2.
• Position #3 - The thin needle (single line) points to ADF1. The thick needle (double line) points to ADF2.
• Position #4 - The thin needle (single line) points to ADF1. The thick needle (double line) points to VOR2.

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Note: VOR1 is the VOR frequency you have dialled into NAV 1 receiver. VOR2 is the VOR frequency you have dialled into NAV 2 receiver. ADF1 is the NDB frequency you have dialled into ADF 1 receiver. ADF2 is the NDB frequency you have dialled into the ADF 2 receiver.

 RMI - Heading Indicator 

The RMI also functions as a heading indicator by using a slaved gyro to always show the direction of the aircraft in relation to magnetic north at the 12 o'clock position.

There is additionally a Heading Selector bug that can be manipulated using the HDG Selector Knob at the bottom left to choose a heading target for the autopilot when using Heading Hold mode.

Example - Current Heading 145 deg,
Selected Heading 200 deg

For more information on Autopilot Operation please refer to the manual or see: