DIGITAL CHRONOMETER GENERAL The THOMMEN CM20 is a Swiss Made precision, multifunctional chronometer designed to operate under the most stringent operating conditions in civil and military aircraft. The CM20 is designed according the latest civil and military avionics standards. It features a three line display with light digits on dark background (negative image). It supports the simultaneous indication of a combination of clock- and timer-function reading and has several day/night mode backlight options including NVIS A and B compatibility. The time base is supplied by a dedicated internal power reserve to provide the timekeeping function even when the aircraft power is removed. PARAMETERS 24 hour clock for UTC or Local Time (LT) in 12/24 hrs format Up or down counting Elapsed Timer (ET/ETD) Maintenance Timer (MTH) Simultaneous display of Clock and either elapsed or flight timer readings Flight Timer (FT) with pre-settable alarm (FTA) ETD and FTA with a common switching output or an external signaling device Flight Timer (FT, FTA and MTH) remotely controlled by a configurable switch input Remote setting functions via serial link (RS-232) in master and slave mode Installer accessible installation feature settings Installer customizable Lighting Dimming Curve for day and night mode Lighting options (white/white, white/red, white/green NVIS A&B) Comprehensive Built In Test with internal maintenance and failure log THOMMEN AIRCRAFT EQUIPMENT AG Hofackerstrasse 48 | CH-4132 Muttenz | Switzerland Phone: +41 (0)61 965 22 22 | Fax: +41 (0)61 961 81 [email protected] www.thommen.aer

yfriOflllEiiK AIRCRAFT EQUIPMENT DIGITAL CHRONOMETERTYPE CM20 SWISSCHRONOPERFORMANCE SPECIFICATION TIME BASE ACCURACY: better than ± 0.2 s / 24 h LIGHTING OPTIONS FOR NVIS EQUIPMENT COMPATIBILITY: MIL-STD-3009 TYPE I CLASS B or RTCA/DO-275 or OST 1 SUPPLY POWER: Nominal 14 or 28 VDC < 300 mA 0 28 VDC LIGHTING MODE INPUT SIGNAL 0 to Supply Power Voltage sinks < 5 mA against power return (CENTRAL INSTRUMENT PANEL DIMMING MODE SIGNAL): FT & MTH RUN SIGNAL: 0 to Supply Power Voltage sinks < 5 mA against power return ETD & FTA ALARM OUTPUT SIGNAL: Solid state switch output sinking < 1000 mA against...