SDK [EVT_MCP_MACH_SET] seems not to work correctly (SP1b)

[ruijihin 0]

Hi.

Please let me ask a question about SDK.

 

I have tested the 777 SDK, to find that I cannot set MACH speed correctly with "EVT_MCP_MACH_SET" while

other SET-MCP-VALUES events were perfectly working.

 

My attempt is

 

 1. Flying at FL300 and  at Mach speed 0.80.

 2. Set IAS/MACH mode to "MACH mode".

 3. Run a program with following code.

 

      hr = SimConnect_MapClientEventToSimEvent(hSimConnect, EVENT_SET_MACH, "#84135");

      SimConnect_TransmitClientEvent(hSimConnect, 0, EVENT_SET_MACH, 60, SIMCONNECT_GROUP_PRIORITY_HIGHEST,SIMCONNECT_EVENT_FLAG_GROUPID_IS_PRIORITY);

      //Header comment says "Sets MCP MACH (if active) to parameter*0.01 (e.g. send 78 to set M0.78)", so M0.600 is expected.

 

 4. The value of Mach indicator window is set to "0.780".

 5. Re-run the same program, then value is set to "0.762", then -> .746 -> .731 -> .718 ->->->->-> .604

 6. No value change after converging on .604.

 

In addition, Setting from M0.600 to M0.800 was result in converging on .795 after several running,

and the other setting events (IAS, HDG, ALT, V/S, FPA) worked as I expected.

 

Is it caused by my wrong usage or bug ?

And is there any other way to manage to set MACH ?

 

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Shunsuke Yamabe