MFA Exit Exam • Set 2 Question 1 of 30

What parameter must be verified prior to authorizing enclosed space entry for operational safety and hazard prevention related to Medical First Aid?

✓

Direct Answer

Option B: Atmospheric oxygen level at 20.9% and zero toxic/flammable gas concentration

Enclosed space entry demands an ambient oxygen concentration of 20.9% and the total absence of toxic or flammable gases, as mandated by SOLAS and IMO guidelines. Entering without verified atmospheric testing risks rapid asphyxiation or chemical poisoning, undermining foundational maritime safety protocols.

All Options

A

Visual inspection through access hatch without gas testing

B

Atmospheric oxygen level at 20.9% and zero toxic/flammable gas concentration (Correct Answer)

C

Temperature check only

D

Oxygen level at 15% with ventilation turned off

Detailed Explanation & Context

Enclosed space entry demands an ambient oxygen concentration of 20.9% and the total absence of toxic or flammable gases, as mandated by SOLAS and IMO guidelines. Entering without verified atmospheric testing risks rapid asphyxiation or chemical poisoning, undermining foundational maritime safety protocols.

Relevant Framework: STCW 2010 Manila Amendments • DG Shipping E-Learning & Exit Exam Standards • Medical First Aid (MFA).

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