This long video shows the teardown, reverse engineering and test of an Altitude Alert Indicator manufactured by Astek Division in the 70s.
The first part of this video shows the teardown followed by the test of this instrument.
The second part is more theoretical, the general functioning of this unit is explained as well as some particular topics.

00:00 Intro
00:40 Teardown
01:11 Electromechanical assembly
07:22 Electronic assembly
10:37 Test
15:52 Air Data Computer ARINC565 Dual Speed Synchro
18:32 Altitude Alert General functionning
24:48 Synchro, resolver, transolver and differential resolver
33:33 Coarse window generation
36:48 Synchro transmitter presence detection
38:30 Detailed schematic from reverse enginnering

Recorded 2023/10/23