A&P airfram 13 Please provide explanations or reason for the answer 3. A class B

Question

A&P airfram 13

Please provide explanations or reason for the answer

3. A class B fire
A. has a large quantity of air flowing through it, like a turbine engine compartment.
B. has low airflow through it.
C. typically would occur in a compartment with an APU.
D. would typically require twice the extinguishing agent that a class A fire would require.

6. Water in aviation fuel is more apt to be a problem if it occurs as
A. dissolved water. C. process water.
B. free water.    D. humidity.

7. Fuel lines which pass through wheel wells are
A. usually flexible.
B. sometimes made of stainless steel.
C. always made of aluminum alloy.
D. always made of PVC plastic.

Explanation / Answer

1. Class B fire have large quantities of air flowing past aerodynamically clean obstructions. Heat-exchanger ducts and exhaust manifold shrouds are usually of this type, as are zones where the inside of the cowling or other enclosure is smooth, free of  pockets, and adequately drained so that leaking flammables cannot puddle. For example, turbine engine compartments are in this fire class, if the engine surfaces are aerodynamically clean and a fireproof liner is installed to produce a smooth enclosure surface over any adjacent airframe structure. Therefore, the answer is A.

2. Dissolved water is not a problem for aircraft operation as long as it remains in solution. Dissolved water cannot be removed by filtration but can become free water with temperature change. Any water in excess of that which will dissolve is called free water. Free water can appear either as water slugs (in bulk quantities) or as entrained water. Once free, it can cause operating problems. Therefore, the answer is B.

3. A fuel line is a hose used to bring fuel from one point in a vehicle to another or from a storage tank to a vehicle. It is commonly made of reinforced rubber to prevent splitting and kinking. The answer is A.

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