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Nicrative

NGX auto radio tuning

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Hello!

 

Just one question. Does NGX support automatic radio tuning. Because many airlines have that option. I can't find a button for enabling it from my CDU.

 

Thanks!


thanks,

Jouka Ahponen

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Hello Nicrative, You will need to remember to sign your full name when Posting in the Forum, see Pinned Posting requirements. Re your query, you need to go to the radios section where you will see two VOR radios left and right where you can enter Waypoint VOR radio frequencies from your flight routing plan. Look into the Init page whilst enroute which will bring up the approach page for your arrival airport which should contain the ILS data and your flap speeds, providing you are using the current AIRAC which is available from Navigraph and other providers for a small fee. Hope this helps. Richard Welsh.


Richard Welsh

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I know how to fly that plane properly Boeing 737NG that's not the problem. Just asking because for example virtual Norwegian equipment document says: CDU radio tuning - AUTO.

 

Thanks,

Jouka Ahponen


thanks,

Jouka Ahponen

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I seem to remember this being a thing on the classic (-300/-400/-500), However not used for autotuning ILS (like in the 744 for instance), but rather to allow the RNAV/INS to update it's position using Radio navigation triangulation. This is handled differently in the NGX.


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Trent Hopkinson, 2015 Crewmember of www.mangrove.com.au WorldFlight sim

          Youtube channel www.youtube.com/user/musicalaviator

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I seem to remember this being a thing on the classic (-300/-400/-500), However not used for autotuning ILS (like in the 744 for instance), but rather to allow the RNAV/INS to update it's position using Radio navigation triangulation. This is handled differently in the NGX.

 

There is autotuning going on in the background, but it's not obvious unless you know where to look.

 

In the NG, the two DME radios are dual channel units; each capable of tuning and tracking distance from two separate DME ground stations simultaneously. The primary DME channel of each unit is linked to the onside NAV receiver, and will automatically link to the DME channel associated with whatever VOR ground station is manually tuned on the NAV radio control heads on the captain's and copilot's side. That channel remains locked to the selected VOR/DME until such time the the pilots manually tune the control head to a different VOR. It is this DME readout which appears on the cockpit ND displays.

 

The secondary channel of the each DME unit is autotuned by the FMS to provide a DME/DME crossfix for refining the position of the two IRU's. There is no direct cockpit display of the specific DME ground stations which are in use at any given moment. To see which DME stations are in use for IRU position updating, select the FMS NAV STATUS page.

 

DME autotuning can be inhibited in the FMS, but I would assume that it is normally enabled in typical flight operations.

 

The 744, 757 and 767 use single channel DME receivers, so the autotuning of these units is visible in the cockpit... every time a new DME station is tuned, so is the associated VOR receiver.

 


Jim Barrett

Licensed Airframe & Powerplant Mechanic, Avionics, Electrical & Air Data Systems Specialist. Qualified on: Falcon 900, CRJ-200, Dornier 328-100, Hawker 850XP and 1000, Lear 35, 45, 55 and 60, Gulfstream IV and 550, Embraer 135, Beech Premiere and 400A, MD-80.

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