Section 1 General Description
1.1 INTRODUCTION
This manual describes the installation of the
SANDIA aerospace
SAE5-35 Altitude Data System. It
is intended for use by FAA certified repair stations to install the SAE5-35 Altitude Data System and
includes both the mechanical and electrical installation information for the SAE5-35. Calibration and
checkout procedures are included. The installer should insure that all functions are operating accord-
ing to their intended purpose in their particular installation.
1.1.1 Product Description
The SAE5-35 is a solid state -1000 to 35,000 foot altitude data system that converts pressure altitude
into a digital output as set forth in the
International Standard for SSR Pressure Altitude Transmis-
sion
. The data output of the SAE5-35 is referenced to 29.92 inch HG (1013 Millibars). The SAE5-
35 has been designed to provide altitude data to GPS and Terrain Awareness Systems in addition to
Mode C Transponders. The SAE5-35 outputs Gillham Grey Code to the transponder and two inde-
pendent RS232 digital outputs that can be used by GPS or other systems requiring this format.
Additionally, the SAE5-35 includes
SANDIA aerospace’s
exclusive Altitude In-flight Monitoring
(AIM) feature. With the addition of an optional panel mounted switch and annunciator the AIM
mode will monitor and advise the pilot if the aircraft deviates from a selected altitude.
1.2 TECHNICAL CHARACTERISTICS
1.2.1 Physical Characteristics
Width:
4.87” (5.11” with mounting tray)
Height:
1.06” (1.57” with mounting tray)
Depth:
4.74” (4.80” with mounting tray)
Weight:
0.7 lbs. (.86 lbs. with mounting tray)
1.2.2 Operational Characteristics
Operating Temp.
-20
o
C to + 55
o
C
Altitude:
35,000 feet
Voltage:
11 - 32 Vdc
Current
1.0 amps maximum with heater on
<100 mA quiescent
Accuracy:
+/- 50 feet Typical
Resolution:
Grey Code 100’
RS232
10’
Burst Pressure
90 in Hg
Maximum Rate of Altitude Change:
12,000 Feet/Minute
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