Sandel ST3400 - Initialize GPS;FMS; Fail the GPS;FMS; Run TAWS Self-Test; Verify the ST3400 Display

7.2.23 Initialize GPS/FMS
And, activate a valid flight plan. Verify that the ST3400 displays valid terrain,
and is function properly. Place a metallic object over the GPS/FMS antenna so as
to block reception of all GPS/FMS satellites. Verify the GPS/FMS position
solution is no longer valid, and that the flight plan is no longer active. Verify the
ST3400 flags the terrain display. Note: Some GPS/FMS receivers, only
provide a valid output after developing a ground track.
Pass / Fail:
Remarks: ______________________________________________________
7.2.24 Fail the GPS/FMS
And, verify that TERR FAIL is displayed, and the ST3400 displays “TAWS
INH”.
Pass / Fail:
Remarks: ______________________________________________________
7.2.25 Run TAWS self-test
And, verify aural annunciations are acceptable in clarity and volume (both
loudspeaker and headphone aural annunciations).
Pass / Fail:
Remarks: ______________________________________________________
7.2.26 Verify the ST3400 display
Verify display is viewable under all expected cockpit ambient light conditions
(this test should be performed in bright daylight, and again at night or in a
simulated dark cockpit).
Pass / Fail:
Remarks: ______________________________________________________
7.2.27 Verify the ST3400 manual display
Verify manual display brightness lighting control is operating, and provides
display brightness over the full range of control for all normal cockpit lighting
conditions.
Pass / Fail:
Remarks: ______________________________________________________
82002-IM-L ST3400 INSTALLATION MANUAL 7-29