ENSTROM 480B RFM SUPPLEMENT
7-1
Report No. 28-AC-035
Mar 9/09
CHAPTER 7. SYSTEM DESCRIPTION AND OPERATION
7-1. System Description
1. The Sandia SAE5-35 is a solid state altitude data
system (blind encoder) that converts pressure altitude into
a digital output. The data output is referenced to 29.92 in
Hg (1013 Millibars). The SAE5-35 outputs altitude data
via Gillham Grey Code or two independent RS232 digital
outputs to Mode C transponders.
2. The SAE5-35 encoder automatically provides
altitude data to the transponder when the transponder is
operating in Mode C.
3. Power to the SAE5-35 encoder is provided via the
ENCDR circuit breaker (CB) (2 Amp) located on the lower
left side of the center pedestal.
7-2. Operation – AIM Function
1. The SAE5-35 also has an “Altitude In-flight
Monitoring” (AIM) function that informs the pilot if the
aircraft deviates from a pilot’s selected altitude. This
feature has no effect on and is independent of the
pressure altitude data that is output to the transponder.
The annunciator portion has two annunciators labeled
‘
ALT’ and ‘SET’.
2. To operate the AIM function, use the following
procedure (as specified in the SAE5-35 Pilot’s Guide).
a. When you have arrived at your desired cruise
altitude, press the AIM ‘
SET’ pushbutton. The aircraft’s
current altitude is stored in memory when the pushbutton
is released. Both annunciators should illuminate for
approximately one second when the button is released to
test the annunciator bulbs. Do not use the AIM function
if both bulbs do not briefly illuminate. After one second
the ‘
ALT’ annunciator will extinguish and ‘SET’
annunciator will stay illuminated, telling you that an
altitude is set in the SAE5-35’s memory.
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