Appendix A: Post-Installation Procedures
82005-IM-K
Sandel SN3500 Installation Manual
Page 7-10
LOC DV
NONE
429
429H
ANALOG
COMP
Selects localizer signal input. The
SN3500 has a built-in NAV converter to
decode localizer validity and deviation
from a composite signal input.
If COMP is selected see following
“Composite LOC Calibration
procedure”.
GAIN
Used to calibrate LOC DV COMP
GS DV
NONE
429
429H
ANALOG
Selects glideslope signal input.
OBS CAL
DEFAULT 0.0°
Calibrates NAV1 OBS.
DME NONE
429
429-MC
568
KSD
ANALOG
Selects DME signal input.
HOLD NONE
ON HIGH
ON LOW
Selects DME HOLD discrete input to
active high or low.
ZERO DEFAULT
000
Present
only
if Analog DME is selected.
Use to set zero point of DME input if
necessary.
SCALE DEFAULT
1.00
Present
only
if Analog DME is selected.
Use to calibrate DME if necessary.
7.1.5.1 OBS Calibration (Does not apply to 429 or 400HZ Differential Resolvers)
Note: Maintenance mode and operational mode can be toggled by pressing and
holding the CRS knob.
a) In operational mode set the SN3500 course pointer (OBS) to zero degrees. Set
the NAV test set to zero degrees.
b) In Maintenance Mode, adjust the OBS CAL setting to center the deviation needle.
c) Set the test set to 45 degrees. Turn the course pointer to re-center the deviation
needle. If it is with a few degrees of 45 degrees, then proceed. Otherwise if it is
about 90 degrees out, change the OBS ROT setting on Maintenance Page 10 to
REVERSED and return to step a.
d) Check the to/from flag on the SN3500 display. If to/from is reversed (and correct
wiring has been verified) adjust the OBS CAL 180 degrees from the current
setting.
Summary of Contents for SN3500
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