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Page 4-14
GNS 400W Series Maintenance Manual
Rev. A
190-00356-05
Measure J1-27 relative to J1-28. Full up/down (± 150 mV) selections are also available but are
not tested. All tolerances are derived from meeting preliminary WAAS specifications of 3%
centered and 5% linearity of full scale deflection (150 mV).
MAX UP
CENTER
MAX DOWN
+300 ± 15 mV
0 ± 4.5 mV
-300 ± 15 mV
To/From Output
Load: 67 ohms (three 200 ohm loads) across J1-25 and J1-26. Command the test via the main
CDI/OBS configuration page (Figure 4-5). Measure J1-25 relative to J1-26.
TO FLAGGED FROM
+250 ± 20 mV
0 ± 5 mV
-250 +50mV/- 20 mV
Main Lateral Flag Output
Load: 333 ohms (three 1000 ohm loads) across J1-23 and J1-24. Command the test via main
CDI/OBS configuration page (Figure 4-5). Measure J1-23 relative to J1-24.
OUT OF VIEW
IN VIEW
+300 ± 30 mV
0 ± 25 mV
Main Vertical Flag Output
Load: 333 ohms (three 1000 ohm loads) across J1-29 and J1-30.
Command the test via main CDI/OBS configuration page (Figure 4-5).
Measure J1-29 relative to J1-30.
OUT OF VIEW
IN VIEW
+300 ± 30 mV
0 ± 25 mV
Main Lateral Super Flag Output
Load: resistor to ground such that is will sink 500 mA when attached to AIRCRAFT
POWER. (J1-19 or 20). Applicable output will source this current when active. If the
load is sized for 13.8 V operation then this test should not be run at 27.5 V.
Command the test via the main CDI/OBS configuration page (Figure 4-5). Measure at J1-
17.
OUT OF VIEW
IN VIEW
AIRCRAFT POWER - 1.5 V dc min
V dc max
Main Vertical Super Flag Output
Load: resistor to ground such that it will sink 500 mA when attached to AIRCRAFT
POWER. (J1-19 or 20). Applicable output will source this current when active. If the
load is sized for 13.8 V operation then this test should not be run at 27.5 V.
Command the test via the VOR/LOC/GS CDI configuration page (Figure 4-6). Measure
at J1-18.
OUT OF VIEW
IN VIEW
AIRCRAFT POWER - 1.5 V dc min
V dc max
