PSA Airlines Canadair Regional Jet Systems (PSA-CRJ) Practice Exam

What provides the static source used by the CPAM?

1. S1

2. S2

3. S3

4. S4

The correct answer is: S3

The correct answer identifies that the static source utilized by the Centralized Fault Display Interface (CFDI) or the Cabin Pressure Acquisition Module (CPAM) is taken from S3. The S3 static source is specifically chosen because it is designed to provide reliable and accurate static pressure readings necessary for the operation of the CPAM. The CPAM uses this static pressure data for various functionalities, including cabin altitude reporting and the activation of cabin pressure warning systems. Having a stable and precise static source is crucial for the accurate management of the aircraft's cabin environment, particularly during altitude changes and in maintaining passenger comfort. Other static sources, while also vital for different systems, may not be as directly associated with or appropriate for the CPAM's required functions as S3. Understanding the relationship between the components and their specific roles in data acquisition modules like the CPAM is essential for effective aircraft systems operation.