GH-3100
Installation & Operation Manual
TP-559
Operation
Page 5-25
Revision K
March 30, 2017
5.3 OPERATIONAL FUNCTIONS
5.3.1 Power ON Sequence
Starting with the application of +28.0 Vdc the indicator sequences through the following modes:
•
Power ON Self Test Mode
•
Identification Mode
•
Sensor Alignment Mode
•
Normal Operating Mode
NOTE
Sensor alignment mode reaches normal operation mode within three
minutes of applying power. During abnormal conditions, such as motion
during the sensor alignment mode, the indicator resets and attempt to
reach the normal operation mode within six minutes of applying power.
5.3.1.1 Power-On Self Test Mode
During the power-on self-test mode, the indicator tests its internal sensors, interface circuitry, and
memory devices. The display is blank for the duration of the power-on self-test mode.
5.3.1.2 Identification Mode
When power-on tests are complete, the indicator displays an identification screen, software identification
numbers, a software copyright notice, total number of operating hours, and aircraft effectivity or the result
of the power-on self tests (if a failure is detected).
NOTE
If there has been a failure, which affects the display hardware, the
attempt to display the identification screen may fail.
The identification mode displays self-test results as described in the following paragraphs.
5.3.1.2.1 Air Data Failure
If the unit fails the air data self-test or valid V
MO
and SSEC data is not in the DCM-3100, the
identification screen has the words "AIR DATA FAILURE" as the test results. This screen is shown for
14 to 16 seconds before the unit enters the sensor alignment mode.
5.3.1.2.2 DCM Failure
If valid configuration data cannot be obtained from the required DCM, the identification screen has the
words “Configuration Required” as the test results. The indicator remains in the identification mode for as
long as power is applied, with no attempt to sequence through the sensor alignment mode to the normal
operational mode.
