Garrecht Avionik GmbH
VT-01 Transponder
Installation Manual - english -
Document:
01.0200.11E
Revision: 1.3
39
passed
Altitude Reporting test
General:
A sufficient number of test points should be checked to ensure that the altitude reporting
equipment and transponder perform their intended function through their entire range
while ascending or descending. Tests some altitude steps to ensure proper operation of
each altitude code segment of the encoder.
Verify that the correspondence error value of the altimeter system is 125 feet or less.
Verify that exceeding 50.000 ft and -1.000 ft generates an out of range error message, if
using the internal alticoder.
Verify that exceeding 62.700 ft and -1.000 ft generates an out of range error message, if
using external alticoders.
If alticoder set to 100 ft resolution:
Verify in all cases that the Q bit is set to 0.
If alticoder set to 25 ft resolution:
Verify in all cases that the Q bit is set to 1 for altitudes up to 50.170 ft. For altitudes above
50.170 ft, the Q bit must be set to 0.
Airspeed Fixed Field
Interrogate the equipment to confirm the maximum airspeed report.
On-the-Ground Condition
If a means for automatically indicating the on-the-ground condition (e.g. a weight on
wheels or struct switch)
is available
:
Verify that the equipment correctly reports the "on-the-ground" condition in the CA,
FS and VS fields.
Verify that the equipment correctly reports the "airborne" condition in the CA, FS,
and VS fields.
If a means for automatically indicating the on-the-ground condition (e.g. a weight on
wheels or struct switch)
is not available
:
Verify that the FS and VS fields indicate that the aircraft is airborne and that the
CA field indicates that the aircraft is either airborne or on the ground (CA=6).
Also verify that when the unit is in the "inhibit replies" condition (on the ground), the
transponder continues to generate Mode S squitters and replies to discretely addressed
Mode S interrogations (UF=0,4,5,16,20,21,24), but does not reply to Mode A/C/S All-Call
or Mode S-Only All-Call interrogations (some installations may inhibit Mode A/C).
If the unit is not in the "inhibit replies" condition (Airborne condition), verify that the
transponder continues to generate Mode S squitters and also replies to Mode A/C, Mode
A/C/S All-Call or Mode S Only all Call and discretely-addressed Mode S interrogation
(UF=0,4,5,16,20,21,24),
Aircraft Identification (AIS)
Interrogate the equipment with UF=4 or 5, and correct aircraft address with RR=18 and
DI
7 or DI=7 and RRS=0. Verify that the equipment correctly reports the AIS information
in the MB field of the reply.
