User's Manual

SYSTEM DESCRIPTION AND INSTALLATION MANUAL
T
3
CAS/Part No.9005000
Table 1-5 - T3CAS Unit Deviation Notes
Deviation 5: TSO-C166a: DO-260A 2.2.3.6 ADS-B Airborne Velocity Messages;
TSO-C112: DO-181C 2.2.16.2.6.2.4.2 Register Timeout.
This deviation from DO-260A and DO-181C sets all codes in the Airborne Velocity Message to
ZEROS except the type code when a data time-out occurs. The Type Code field continues to be
transmitted as 19 under this condition. Setting the data fields in the Airborne Velocity Message will
signify no data available for the N/S Velocity, E/W Velocity, Vertical Rate and Difference From
Barometric Altitude data fields. The Subtype Code will be set to an invalid code of zero. The ADS-B
receiving system will ignore the data fields since they are set to invalid states, which provides an
equivalent level of safety.
Deviation 6: TSO-C119c, TSO-C112 and TSO-C166a: DO-160E 21.4 Radiated RF Emissions
The T
3
CAS Processor has a high power RF transmitter which is used to generate both the 1030 MHz
and 1090 MHz waveforms for TCAS, Mode S Transponder and ADS-B OUT functions. Due to the
high RF power requirement and inherent non-linearities in RF transmitters, the harmonics of the
transmitter exceed the RF radiated emissions limit in DO-160E Category M. The T
3
CAS deviates
from DO-160E Section 21 Category M Radiated RF Emissions in the following frequency bands when
the transmitter is active:
1030 ±60 MHz (TCAS fundamental)
1090 ±60 MHz (Transponder fundamental)
2060 ±60 MHz (2nd TCAS harmonic)
2180 ±60 MHz (2nd Transponder harmonic).
3090 ±60 MHz (3rd TCAS harmonic)
3270 ±60 MHz (3rd Transponder harmonic).
4120 ±60 MHz (4th TCAS harmonic)
4360 ±60 MHz (4th Transponder harmonic).
5150 ±60 MHz (5th TCAS harmonic)
5450 ±60 MHz (5th Transponder harmonic).
The avionics installer must conduct the appropriate testing required to ensure that other aircraft
systems are not adversely affected in the above frequency bands when the T
3
CAS transmitter is
active.
Deviation 7: TSO-C119c: DO-185B 2.3 Equipment Performance – Environmental Conditions
The T
3
CAS LRU is tested to the environmental test conditions set forth in Environmental Conditions
and Test Procedures for Airborne Equipment, RTCA DO-160E, December 9, 2004 instead of the
RTCA DO-160F standard called out in the RTCA DO-185B MOPS. The T
3
CAS deviates from TSO-
C119c to allow the use of DO-160E Environmental Test Procedures.
Deviation 8: Alternate GPWS Curves
TSO-C151b, Appendix 1,1.3.e stated that deviations to the DO-161A alerting requirements to
minimize nuiance alerting if equivalent level of safety could be provided for 5 specific conditions. In
T
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CAS 1.2 and other TAWS systems, ACSS has supplied alternate alerting logic and gotten it
approved as part of the TSO. In TSO-C151c Class A, the phrase “the deviation is approved under the
provision of 14 CFR §21.618” was added to this section. Thus, this deviation has been previously
approved, but now needs to be formally listed as a deviation.
Deviation 9: TSO-C112d, TSO-C117a, TSO-C151c, TSO-C166a and TSO-C166b Part Marking
requirements.
This deviation is in regards to the part marking requirements of:
• TSO-C112d, Sections 4(a) and 4(b)
• TSO-C117a, Section g(1) and g(3)
1-10
04 Nov 2014
34-45-29
Pub. No. 8600200-001, Revision 004
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