General Authority of Civil Aviation (GACA) Aeronautical Information Publication (AIP) Practice Exam

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What causes the pack OFF light to illuminate?

The pack is manually turned OFF
The pack valve has failed closed due to various reasons
Both packs in the system are malfunctioning
The APU is not providing sufficient power

The correct answer is: The pack valve has failed closed due to various reasons

The illumination of the pack OFF light indicates a specific issue related to the pack valve, which is responsible for regulating the air conditioning system within the aircraft. When the pack valve fails to operate correctly and is stuck in the closed position, it obstructs airflow from the pack to the aircraft’s cabin, thereby triggering the pack OFF light. In essence, the pack valve's failure to function as intended results in the system being unable to provide conditioned air, thus prompting the alert. Monitoring this indicator is critical since it informs the crew that the air conditioning system is compromised, which could affect cabin pressure and temperature control if not addressed. This option identifies a systemic failure that has a direct impact on the aircraft's environmental control systems, whereas the other options either suggest manual actions or failures that do not specifically relate to the valve's functionality.