Sandel ST3400 - Discrete Inputs Tests; Nav& Ils Input Tests

7.2.15 DISCRETE INPUTS TESTS
Check all discrete inputs that are interfaced to Sandel ST3400 TAWS/RMI.
See Sandel ST3400 TAWS/RMI installation wiring diagrams for aircraft.
Select ST3400 to Maintenance Page 6: DISCRETES.
SIGNAL
FUNCTION
RESULT
PASS
FAIL
Engage Autopilot AP ENGAGE Verify value “ENGAGED” when
AP engaged
Disengage Autopilot AP ENGAGE Verify value “DISENGAGED when
AP disengaged
Alert Inhibit ALERT Activate remote switch if installed,
Verify value “ALERTS
DISABLED”, release switch and
verify value “ALERTS ENABLED
Self Test TEST Activate remote switch if installed,
Verify value “ALERTS TEST
ENABLED” , release switch and
verify value “ALERTS TEST
DISABLED
Cycle flaps through
all settings
FLAPS Verify value with flaps in landing
configuration is “FLAPS DOWN”
and in all other positions (including
takeoff) is “FLAPS UP”.
Landing Gear GEAR Verify value indicates “GEAR
DOWN” on ground.
Test Gear up during flight test.
Windshield Wiper
Input
WINDSHIELD
WIPERS
Activate Windshield Wiper and
verify input in Audio Output
7.2.16 NAV& ILS INPUT TESTS
Select ST3400 to Maintenance Page 7: NAV & ILS.
SIGNAL
FUNCTION
RESULT
PASS
FAIL
#1 VOR/ILS
Receiver, generate
external VOR signal
at 0 degrees TO.
NAV1 Nav 1 value VOR BEARING should
read 0 degrees TO, calibrate BRG on
page 6 if required. Verify value “ILS
NOT TUNED” is shown.
#1 VOR/ILS
Receiver, generate
external Localizer
signal, vary the input
deviation. Test at 0, +-
.046 and +-.093DDM
NAV1 Nav 1 value should indicate “ILS
TUNED” and “LOC DEV DDM”
deviation should match generated
signal.
82002-IM-L ST3400 INSTALLATION MANUAL 7-25