Thommen AD20 - 2 SECTION II; 2.1 General Information; 2.2 Description; 2.2.1 Instrument Description

REVUE THOMMEN AG
CH-4437 Waldenburg
AD20 Standby Altimeter
Page 4 of 72
07-Sep-2009 Document No: AD-INSOP-800 Revision: 1.6
2.3.1.2 Micro Controller ............................................................................................................. 23
2.3.1.3 ARINC 429 Interface (optional)..................................................................................... 23
2.3.1.4 Pointer Positioning ........................................................................................................ 24
2.3.1.5 Dial and Display ............................................................................................................ 24
2.3.1.5.1 Dial and Display Lighting Default Function............................................................. 25
2.3.1.6 Configuration Identification............................................................................................ 26
2.3.1.7 RS232 Serial Interface .................................................................................................. 26
2.3.1.8 Operating Range, Limiting Values and Tolerances...................................................... 26
2.3.1.9 Battery Status Display Overview (optional) .................................................................. 27
2.3.1.10 Digital Display............................................................................................................ 28
2.4 TESTING...................................................................................................................................30
2.4.1 Startup BIT Sequence ....................................................................................................... 30
2.4.1.1 Display of all LCD segments / white lighting................................................................. 30
2.4.1.2 Display of battery charge / amber lighting (optional) .................................................... 30
2.4.1.3 Display Config ID and A/C type .................................................................................... 31
2.4.1.4 Display current altitude and baro setting ...................................................................... 31
2.4.2 Built-in-Test ....................................................................................................................... 32
2.4.2.1 BIT Overview ................................................................................................................. 32
2.4.2.2 Start Up BIT................................................................................................................... 32
2.4.2.3 Initiated BIT ...................................................................................................................32
2.4.2.4 Continuous BIT.............................................................................................................. 32
2.4.3 Failure Modes.................................................................................................................... 33
2.4.3.1 Fault Code Handling Overview ..................................................................................... 33
2.4.3.2 Non critical or tolerable Failures ................................................................................... 34
2.4.3.3 Critical Failure Indication............................................................................................... 35
2.4.3.4 Power Failure ................................................................................................................ 35
3 SECTION III................................................................................................................................... 36
3.1 Approvals................................................................................................................................. 36
3.1.1 General.............................................................................................................................. 36
3.1.2 Instructions for Continued Airworthiness .......................................................................... 36
3.1.3 Environmental Qualification .............................................................................................. 37
3.1.3.1 Electromagnetic Environment (EME)............................................................................ 40
3.1.3.2 Electromagnetic compatibility (EMC)............................................................................ 40
3.1.3.3 Electromagnetic interference (EMI) .............................................................................. 40
3.1.3.4 Pointer position error ..................................................................................................... 40
3.1.3.5 Scale error .....................................................................................................................40