19 User-Modifiable Software
Acronym
| ACARS | Aircraft Communications Addressing and Reporting System |
| ACMS | Airplane Condition Monitoring System |
| AMI | Airline-Modifiable Information |
| EASA | European Aviation Safety Agency |
| FAA | Federal Aviation Administration |
| PSAC | Plan for Software Aspects of Certification |
| UMS | user-modifiable software |
19.1 Introduction
This chapter defines user-modifiable software (UMS) and provides several examples of such software. The chapter then explains certification guidance to consider when designing an airborne system that contains UMS. The last section focuses on the user (e.g., an airline) who will modify and maintain the software after system certification.
19.2 What Is User-Modifiable Software?
UMS is “software ...
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