S1 MENU Displays the main menu.
S2 NEXT Selects other timing functions.

CONTROL/ LEGEND S3 RESET S4 STARTor STOP
S1 MENU S2 NEXT S3 RESET S4 START or
STOP
S1 MENU S2 NEXT S3 UP
S4 DOWN
3.20.3.4 Options Mode. Displays the latest built-in-test result and allows the pilots to initiate a complete self test (Figure 3-32, Options Menu). OK indicates no faults de-
tected during continuous self test. FAULT indicates a fault is detected (Table 3-3). The system will always power up with HDG Stabilization on. If the aircraft external heading
FUNCTION
Returns stopwatch digits to zeros.
Starts or stops stopwatch time counting feature. Elapsed Timer Mode
Displays the main menu.
Selects other timing functions.
Returns elapse time digits to zeros.
Starts or stops elapsed timer

counting feature.
Set Current Time/Date Mode

Displays the main menu. Highlights the digits to be changed.
Increments number(s).  the  highlighted 
Decrement number(s).  the  highlighted 

source (gyro) fails, the HDG Stabilization feature should be turned off manually. Also, HDG Stabilization should be manually disabled if a compass failure occurs without caus-ing a .ag condition. When operating in the HDG Stabiliza-tion mode, the pilots may elect to have the Heading Display on or off in any weather mode. When Heading Display is on, the aircraft heading will appear as a digital readout at the top of the display. The following controls and functions are available on the options menu:
CONTROL/  FUNCTION 
LEGEND 
CONTINUOUS  Displays status ON or OFF of built 
TEST  in test. 
HDG Stabilization:  Displays  status  of  heading 
stabilization ON or OFF. 
Heading Display:  Displays status of heading display 
ON or OFF. 
S1 MENU  Access the main menu. 
S2 NEXT  Steps the highlight bar through the 
menu selections. 

CONTROL/  FUNCTION 
LEGEND 
S4 TEST  Initiates  the  built-in-test  when 
highlight  bar  is  over  Continuous 
Test, and toggle between ON and 
OFF  for  HDG  Stabilization  and 
Heading Display selections. 

3.20.3.5 Navigation Display Mode. Weather mapping screen will also display course line to selected waypoints, a course deviation indicator and up to 6 additional data items provided by AMS. On initial start-up, the navaid mode will attempt to display range, ground speed, estimated time en-route, bearing, crosstrack error and estimated time of ar-rival. These additional items may be modi.ed in the op-tions mode.
3.20.4 Storm Scope Normal Operation. After the storm scope is turned on, a self test is automatically per-formed by internal diagnostics to verify system readiness. This test takes approximately 15 seconds. SYSTEM TEST IN PROGRESS should be displayed while test is being performed. Upon satisfactory completion of all tests, ALL TESTS ARE OK will be displayed for 3 seconds, then will be replaced by the main menu. If system is turned on cold, the test may be completed prior CRT start. In this case, the initial display will be the main menu.

Table 3-3. Storm Scope Error Messages.
ERROR MESSAGE ACTION
Bus Error Video Error Data Error Program Memory Video Memory
Real-Time Clock Real-Time Clock Battery
Antenna
Analog Processing
Heading Processing
Microphone Key Stuck HARDWARE ERROR Continued operation is not possible
HARDWARE ERROR Time of day function not available
ANTENNA ERROR Storm information is not available
HARDWARE ERROR Storm information is not available
HARDWARE ERROR Heading stabilization and display not available
　
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