7.11 NAV& ILS Input (Optional Interface)
Select ST3400H to Maintenance Page 7: NAV / ILS.
SIGNAL
FUNCTION
RESULT
PASS
FAIL
N/A
ILS Receiver, generate
external Localizer
signal, vary the input
deviation. Test at 0, ±
0.046 and ±
0.093DDM
NAV
Nav value should indicate “ILS TUNED”
and “LOC DEV DDM” deviation should
match generated signal.
ILS Receiver, generate
external Glideslope
signal, vary the input
deviation. Test at 0, ±
0.046 and ±
0.093DDM
GS
GS value for “GS DEV DDM” deviation
should match generated signal.
7.12 Radar Altimeter (Optional Interface)
Note:
The Radar Altimeter test may be performed by pressing the Radar Altimeter self-test
button, or by utilizing a Radar Altimeter test set. This manual references the use of the Radar
Altimeter self-test button and does not provide the information in the use of a Radar Altimeter
test set. When using a Radar Altimeter Test Set, consult the Radar Altimeter Test Set
manufacturer for Test Set operating instructions. The tests that will be performed to validate
the ST3400H operation with the Radar Altimeter will be tests defined below.
Select ST3400H to Maintenance Page 8: RADALT
SIGNAL
FUNCTION
RESULT
PASS
FAIL
N/A
Radar Altimeter R/T.
Activate Radalt Self-
Test
RA
Radar Altimeter Value should indicate
-5 feet of Radalt test output.
Radar Altimeter Fail,
pull circuit breaker to
go invalid.
1
RA FAIL
INPUT P1-18
Verify value of Radar Altimeter Fail
indicates, “P1-18 < +9VDC”.
Radar Altimeter Fail
reset circuit breaker.
1
RA FAIL
INPUT P1-18
Verify value of Radar Altimeter Fail
indicates, “P1-18 > +11VDC”.
Radar Altimeter Valid
RA VALID
Verify value of Radar Altimeter Valid
indicates, “INVALID DATA”.
Radar Altimeter Valid
reset circuit breaker.
RA VALID
Verify value of Radar Altimeter Valid
indicates, “VALID”.
Rotate the MIN Knob
through Decision
Height
Decision
Height
Aural callout “MINIMUMS”
1
Applies to analog Radar Altimeters only.
82046-IM-K
ST3400H INSTALLATION MANUAL
Page 7-6
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