What condition is indicated if the yellow disk is missing in a fire extinguishing system?

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Prepare for the Aircraft Maintenance Technician 40 OandP Exam. Practice with flashcards and multiple choice questions. Each question is accompanied by hints and explanations to support your learning. Ace your exam with confidence!

Multiple Choice

What condition is indicated if the yellow disk is missing in a fire extinguishing system?

Explanation:
The yellow disk acts as a discharge indicator in many aircraft fire-extinguishing bottle assemblies. It sits in place while the system is charged and ready. When the system is actuated and discharges, the cartridge or mechanism blows the disk out, so it ends up missing. Therefore, if the yellow disk is not present, it indicates the system has already discharged in normal operation. After discharge, the bottle and system require inspection, recharging or replacement, and re-certification as dictated by the maintenance manual.

The yellow disk acts as a discharge indicator in many aircraft fire-extinguishing bottle assemblies. It sits in place while the system is charged and ready. When the system is actuated and discharges, the cartridge or mechanism blows the disk out, so it ends up missing. Therefore, if the yellow disk is not present, it indicates the system has already discharged in normal operation. After discharge, the bottle and system require inspection, recharging or replacement, and re-certification as dictated by the maintenance manual.

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