Garrecht Avionik GmbH
VT-01 Transponder
User manual
Dokument 01.0200.10E
Revision: 1.3
15
13.02.07
4.2. Warnings
The system warns the pilot if a malfunction conditions has been detected that could
lead to a severe failure. It is up to the pilot to eliminate these conditions.
Warnings are indicated in case of undervoltage or operating the system out of the
certified altitude range.
In case of warning, the system shows a
W
on the LCD screen. Additonally, a
frequently repeated audible signal occurs.
Both can be terminated by pressing the
inner knob of the rotary encoder.
After
terminating the warning flag, please check
the active Mode-A reply code
The system continues operation, but it may
be limited.
If an error of the alticoder unit is detected or
the system is operated out of the certified
altitide range, the replied alticode will be set
to zero (same as mode
ON
)
General:
In case of failure or warning, an abbreviated
failure
message
will
be
displayed
alternating with the displayed alticode.
Pressing the mode key to select mode on
or alt, the system continues operating until
a new failure is detected.
If a system failure has been detected by the system, always inform the ATC, if
you are flying in a transponder mandatory zone or other SUA, where a
transponder is required. Never try to find the reason for a system failure or
warning during the flight!!!
4.3. Error codes
The following table shows the meaning of the displayed failure and warning codes. In
some cases, the reason for a warning can be caused in the system installation. Other
failure or warning codes are caused by internal malfunctions. In this case the system
needs to be repaired by an authorised repair shop.
Code
Description
Possible reason
CPNL
Malfunction in the steering unit (memory error,
communication error steering unit <-> central unit
Broken cable or bad contact in
plug
XPDR
Malfunction of central unit
Internal malfunction
ALTC
Failure of integral alticoder
Internal malfunction
PRSN
Failure of pressure sensor
Internal malfunction
!ALTC! >0021
RW ALT 0022
Warning code
Warning indicator
