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Posted (edited)

At risk of sounding really ignorant... I have been trying to find out what the gadget on top of the glareshield in the TBM900 is and how to use it properly. I looked through all of the available manuals and other documents for the aircraft but cannot find anything on this implement. If someone has a link to what this is and how it works I would greatly appreciate it. 

Note... I have subsequently learned that this device is an "angle of attack" indicator or "Alpha Indicator". How it works and how to "read" the various indications within it is still a mystery to me. If anyone has that information... Thanks. 

Edited by SHaines
Posted

The fewer the bars, the lower the AoA.  In normal cruise, 1 green bar is optimal AoA.  While in the green, the aircraft will not stall, and you will not get a warning.  While in the yellow bars, a stall is approaching/imminent.  Red bars indicate the aircraft is stalling and action needs to be taken to recover.

 

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