REVUE THOMMEN AG
CH-4437 Waldenburg
AD20 Standby Altimeter
Page 59 of 72
07-Sep-2009 Document No: AD-INSOP-800 Revision: 1.6
5.2 Maintenance
The Maintenance of the REVUE THOMMEN AD20 Standby Altimeter instrument must be performed
by the manufacturer representative or certified personnel.
The following is the summary of maintenance modes which are provided for maintaining the
instruments:
RS232
Maintenance
Mode
Allows to initialize, calibrate, configure and test the instrument via the RS232
interface and a maintenance software.
NOTE: For clear understanding and use refer to the Maintenance Software
Manual.
Manual
Maintenance
Mode
Allows to check and adjust the instrument when it's installed in the cockpit or
for bench test without use of Maintenance SW:
• Emergency Battery test and capacity measurement
• 1 foot resolution at Altitude display
• Lighting curve selection for 4 different aircraft
• Individual Lighting curve adjustment
The Manual Maintenance Mode shall be only accessible by service staff and
may not be used for regular operation. Provisions are made to avoid
unintentional access.
Table 5-2 Maintenance Modes
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