AFF Exit Exam • Set 2 Question 11 of 30

What safety precaution is mandatory when entering a compartment after a fixed CO2 system has been discharged?

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Direct Answer

Option B: Verify complete gas-freeing and atmospheric testing (O2 at 20.9%) using approved sensors

Entering a space after CO2 discharge is extremely hazardous due to oxygen deficiency and toxic gas concentrations. SOLAS and safety management protocols require thorough ventilation and atmospheric testing to confirm oxygen levels have returned to 20.9% and that the space is gas-free before personnel are permitted to enter without breathing apparatus.

All Options

A

Wait 5 minutes without testing

B

Verify complete gas-freeing and atmospheric testing (O2 at 20.9%) using approved sensors (Correct Answer)

C

Enter immediately after opening door

D

Wear a cotton dust mask only

Detailed Explanation & Context

Entering a space after CO2 discharge is extremely hazardous due to oxygen deficiency and toxic gas concentrations. SOLAS and safety management protocols require thorough ventilation and atmospheric testing to confirm oxygen levels have returned to 20.9% and that the space is gas-free before personnel are permitted to enter without breathing apparatus.

Relevant Framework: STCW 2010 Manila Amendments • DG Shipping E-Learning & Exit Exam Standards • Advanced Fire Fighting (AFF).

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Q1 Regarding deck and engine room operational protocols in Advanced Fire Fighting, what is the mandatory safety standard required under STCW Code Table A-VI/2? Q2 What is the primary function of the emergency fire pump isolation valve located on the main deck? Q3 Under SOLAS regulations, what is the minimum water capacity for the emergency fire pump on cargo vessels? Q4 What type of fixed fire extinguishing system is required for paint lockers having a deck area greater than 4 m²? Q5 What pre-release protocol must be completed before discharging CO2 into an engine room space? Q6 What is the principal extinguishing mechanism of High-Expansion Foam when applied to machinery space bilges? Q7 What is the maximum allowable pressure drop before an SCBA compressed air cylinder must be recharged? Q8 What is the function of the International Shore Connection fitted on shipboard fire mains? Q9 What is the primary objective of boundary cooling during a shipboard compartment fire? Q10 Under SOLAS Chapter II-2, how many firefighter outfits must be carried on cargo ships of 500 GT and above?