Sinn EZM 9 TESTAF, Руководство пользователя, Страница: 13 / 31

13
testaF now provides the answers. For example, a pilot’s watch must withstand
rapid temperature changes and changes in ambient pressure up to
0.044 bar – equivalent to an altitude of about 21,300 metres.
a pilot’s watch is thus subjected to several thousand pressure change cycles
in order to simulate the actual stress conditions on a pilot’s wrist. Besides
being water-resistant, the watch must also be resistant to common aviation
fluids such as fuels, hydraulic fluids and cleaning and de-icing agents. It is
also important that the magnetic field of the pilot’s watch itself does not
interfere with the avionics such as the aircraft’s emergency compass. It may
not dazzle the pilot or produce unnecessary reflections. the watch must also
be resistant to shocks and vibrations and be perfectly readable in the dark.