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

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What does the "BTL DISCH" light indicate?

  1. Engine overload

  2. Extinguisher bottle is discharged or has low pressure

  3. Low oil pressure

  4. Fuel flow interruption

The correct answer is: Extinguisher bottle is discharged or has low pressure

The "BTL DISCH" light is an important indicator within an aircraft's warning system, specifically relating to the status of fire suppression equipment. When this light illuminates, it signifies that an extinguisher bottle has either been discharged or is experiencing low pressure. This is critical information for pilots and crew, as it alerts them to the potential need for immediate action in the event of a fire or hazardous situation. Understanding the importance of this indicator ensures that the flight crew is prepared to manage emergencies effectively. While the other options pertain to different aircraft systems—such as engine performance and fuel management—the "BTL DISCH" light specifically highlights the readiness and functionality of fire extinguishing systems, which are vital for safety during flight operations. Recognizing this light's meaning helps in maintaining safety protocols and responding appropriately to fire risks.

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