G900X/G950 Installation and Maintenance Manual – GDU 1040
Page 2-7
190-00719-00
Revision D
2.4.1 TSO/ETSO
Deviations
Table 2-4. GDU 1040 TSO/ETSO Deviations
TSO/ETSO Deviation
1. Garmin was granted a deviation from TSO-C2d to use RTCA DO-178B instead of RTCA DO-
178A to demonstrate compliance for the verification and validation of the computer software.
2. Garmin was granted a deviation from TSO-C2d to use SAE AS 8019A instead of SAE AS 8019
as the standard for Environmental Conditions and Test Procedures for Airborne Equipment.
3. Garmin was granted a deviation from TSO-C2d to use RTCA DO-160D instead of RTCA DO-
160B as the standard for Environmental Conditions and Test Procedures for Airborne Equipment.
4. Garmin was granted a deviation from TSO-C2d to eliminate the requirement 3.2.3 in SAE AS
8019A that requires “the instrument face to be marked with ‘Airspeed’ or ‘IAS’ and also with the
applicable units of measure.”
TSO-C2d
5. Garmin was granted a deviation from TSO-C2d to modify the requirement 3.2.5 in SAE AS
8019A that requires “The indicating means to be visible from all points on a surface defined as
making an angle of 30 degrees with the perpendicular.”
1. Garmin was granted a deviation from ETSO-C2d to use SAE AS 8019A instead of SAE AS 8019
as the Minimum Performance Standard.
2. Garmin was granted a deviation from ETSO-C2d to eliminate the requirement 3.2.3 in SAE AS
8019A
ETSO-C2d
3. Garmin was granted a deviation from ETSO-C2d to modify the requirement 3.2.5 in SAE AS
8019A.
1. Garmin was granted a deviation from TSO-C3d to use RTCA DO-160D instead of RTCA DO-
160B as the standard for Environmental Conditions and Test Procedures for Airborne Equipment.
2. Garmin was granted a deviation from TSO-C3d to use RTCA DO-178B instead of RTCA DO-
178A to demonstrate compliance for the verification and validation of the computer software.
TSO-C3d
3. Garmin was granted a deviation from TSO-C3d to modify the requirement 3.7 in SAE AS 8004
that requires “The indicating means to be visible from all points on a surface defined as making an
angle of 30 degrees with the perpendicular.”
ETSO-C3d
1. Garmin was granted a deviation from ETSO-C3d to modify the requirement 3.7 in SAE AS 8004
1. Garmin was granted a deviation from TSO-C4c to use SAE AS 8001instead of SAE AS 396B for
Minimum Performance Standards and Environmental Standards.
2. Garmin was granted a deviation from SAE Aerospace Standard AS 8001 to use RTCA DO-160D
instead of RTCA DO-138 as the standard for Environmental Conditions and Test Procedures for
Airborne Equipment.
TSO-C4c
3. Neither TSO-C4c nor SAE Aerospace Standard AS 8001 specifies use of a standard for software
development; Garmin intends to use RTCA DO-178B as the standard for Software Considerations
in Airborne Systems and Equipment Certification.
1. Garmin was granted a deviation from ETSO-C4c to use SAE AS 8001 instead of SAE AS 396B
for Minimum Performance Standards and Environmental Standards.
2. Garmin was granted a deviation from SAE Aerospace Standard AS 8001 to use RTCA DO-160D
instead of RTCA DO-138 as the standard for Environmental Conditions and Test Procedures for
Airborne Equipment.
ETSO-C4c
3. Neither ETSO-C4c nor SAE Aerospace Standard AS 8001 specifies use of a standard for
software development; Garmin intends to use RTCA DO-178B as the standard for Software
Considerations in Airborne Systems and Equipment Certification.
