Thommen AD20 - Page 38

REVUE THOMMEN AG
CH-4437 Waldenburg
AD20 Standby Altimeter
Page 38 of 72
07-Sep-2009 Document No: AD-INSOP-800 Revision: 1.6
Environmental Criteria Requirement
RTCA/DO-160D
Remarks
Waterproofness RTCA/DO-160D Section 10.0 Cat. W
Fluids Susceptibility RTCA/DO-160D Section 11.0 Cat. F Solvent and
cleaning Fluids,
Lubrificating Oils
Sand and Dust: Sand and dust
particles as encountered in desert
areas
RTCA/DO-160D Section 12.0 Cat. D
Fungus: Fungus growth as
encountered in tropical climates
RTCA/DO-160D Section 13.0 Cat. F
Salt Spray: Exposure to salt-sea
atmosphere
RTCA/DO-160D Section 14.0 Cat. S
Magnetic Effect RTCA/DO-160D Section 15.0 Cl. Z
< 0.3m
Power Characteristics DC RTCA/DO-160D Section 16.0 Cat. Z
Normal operating conditions
Max. voltage
Nominal voltage
Min. voltage
Emergency operation voltage level
Ripple voltage
Momentary power interruptions
Normal surge voltage
Engine starting under-voltage
operation
28 VDC
30.3 VDC
28.0 VDC
22.0 VDC
18.0 VDC
up to 1000 ms
up to 50 V for 50 ms
10.0 to 20.5 VDC
(without activated
emergency battery)
Abnormal operating conditions
Voltage steady state
Maximum
Minimum
Low voltage conditions
Momentary under-voltage
operation
Abnormal surge voltage
32.2 VDC
20.5 VDC
0 to 20.5 VDC
12.0 VDC for 7 s
up to 80 V for 100 ms
up to 48 V for 1 s