Showing posts with label TAS. Show all posts
Showing posts with label TAS. Show all posts

Saturday, June 18, 2016

TAT / SAT / TAS Indicators

So this is a typical 737 unit that displays three important values in the same device.

TAT: Total Air Temperature
SAT: Static Air Temperature
TAS: True Airspeed

Some info about the unit...

Brad: Smith Industries
PN: 2261-02-1


How this works...

This unit needs 26VAC 400Hz power supply, and it is fully digital.
It is featured with one Arinc 429 low speed bus input (12.5 KHz), which expects three Labels.
The Labels (written in Octal) are:

TAT: 211
SAT: 213
TAS: 210

Pinout info...

This unit is easy to open and doing back engineering I got the following:


A picture of the device during the BITE test: