2.4.2 OAT Requirements
If Corrected Barometric Altitude is used as an input to the system (see above), a
source of OAT is required. This is used to compensate for cold weather errors in
the altitude readings. At extremely cold temperature these errors can be in excess
of a thousand feet.
The source of OAT can be internal (a probe connected to the ST3400) or from the
airdata system. Most digital airdata systems provide, and the ST3400 can accept
digital OAT. If this data is not supplied or an analog airdata system is used, an
OAT probe is connected directly to the ST3400 to provide OAT.
NOTE: The internal OAT probe is only supported in ST3400 software version
2.00 or later.
2.5 Pre-installation Planning
The installation planning cycle is summarized as follows:
1. Determine the desired functional characteristics for the installation.
2. Compile an equipment list for the aircraft.
- For Class-A installations ensure the radar altimeter model provides an
acceptable 2000’ or 2500’ maximum altitude.
- GPS altitude data from approved receivers may be used to supply altitude.
See above discussion of “altitude sources”
- Airdata may be required. See above discussion of “altitude sources”
- See above discussion of “OAT” above to determine the requirement for
OAT probe.
- If the desired equipment is not listed in the installation manual diagrams,
contact Sandel for interoperability
3. Review the installation considerations given in the Installation Considerations
section of this manual.
4. Study the installation drawings to determine a basic interconnect scheme and
check for conflicts.
5. Develop the specific wiring diagrams unique to the aircraft.
6. Assemble required tools. Recommended crimp tools are given in the
following table.
ST3400 INSTALLATION MANUAL 82002-IM-L
2-4
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