Ac 20-153a acceptance of Aeronautical Data Processes and Associated Databases

Exceptions to RTCA/DO-200A. Digital Error Detection Techniques

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AC 20-153A
AC 20-181 - Airworthiness Approval of AHRS

Table 1: Relationship Between Assurance Levels and Digital Error Detection Performance Assurance Level Probability of Undetected corruption

17. Exceptions to RTCA/DO-200A. Digital Error Detection Techniques. Table 1 of this AC replaces Table C of RTCA/DO-200A. This change reconciles the RTCA/DO-200A guidance with aircraft design assurance guidelines (AC 25.1309, AC 23.1309, etc. This change does not impact the acceptability of data in Contracting State AIPs, where table C (RTCA/DO-200A, appendix C, paragraph C, Table C) may still be used.
Table 1: Relationship Between Assurance Levels
and Digital Error Detection Performance
Assurance Level
Probability of
Undetected corruption
1 < 10
-9 2 < 10
-5 3 Not applicable
18. How does this guidance apply to origination of data
a. RTCA/DO-200A, section 1.5.4.2 describes aeronautical data origination, however, oversight of Contracting State data is outside the scope of this AC.
Note: For navigation data, ICAO Annex 15 states that each Contracting State must take all necessary measures to ensure the aeronautical information/data it provides is adequate, of required quality (accuracy, resolution and integrity, and provided in a timely manner for the general conditions under which the service or facilities are available for international use.
b. Contracting States are encouraged to follow RTCA/DO-200A, RTCA/DO-201A,
RTCA/DO-272B, and RTCA/DO-276A and apply the standards to the origination of the data.
ICAO defines the standards for Contracting State data.
Note: Any noncompliance with ICAO standards may impact safety. The Contracting State should first attempt to comply with ICAO requirements. If the Contracting State is unable to comply, it should communicate all noncompliance through the AIP.

09/20/10 AC Ab c. If any participant in the aeronautical data chain supplements Contracting State originated data or originates data that is independent of the Contracting State, that participant must meet the requirements in paragraph 13 of this AC regarding the origination of the aeronautical data.

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