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

During engine starting, which statement is NOT true?

1. FADEC will terminate an abnormal start

2. FADEC selects igniters A or B to use

3. No starter cutout indicates starter is still engaged

4. FADEC disables all igniters

The correct answer is: FADEC disables all igniters

The selected answer indicates that the statement regarding FADEC disabling all igniters is not true. During the engine starting process on a Canadair Regional Jet, the Full Authority Digital Engine Control (FADEC) system is designed to actively manage and monitor various parameters to ensure a safe and efficient start sequence. In a normal start, FADEC will engage the igniters and monitor the conditions of the engine closely. It can select between the two igniters—A or B—depending on which one is deemed optimal for the starting conditions. FADEC keeps the igniters activated to support combustion and does not disable them completely during the engine starting sequence. Additionally, if there is an abnormal start detected, FADEC is programmed to terminate the starting process to prevent potential engine damage, ensuring safety. The absence of a starter cutout signal indicates that the starter is still engaged, which could mean that the engine has not yet reached the necessary speed for the start to be confirmed. Thus, the statement about FADEC disabling all igniters is incorrect because FADEC actually maintains igniter operation until engine conditions support a safe ignition.