IA Fuel Systems & Hydraulic Systems Inspection

Question 1

According to AC 43.13-1B, what category of fuel leak is defined as moisture or fuel that appears as a wet spot but does not form drops?

Accepted Answer

Seep

Answer

Running leak

Answer

Heavy seep

Answer

Stain

Question 2

Which regulation specifically lists fuel filters and strainers as items that must be inspected during an annual inspection?

Accepted Answer

14 CFR Part 43, Appendix D

Answer

14 CFR Part 91.411

Answer

14 CFR Part 23.971

Answer

14 CFR Part 65.95

Question 3

What is the primary aeronautical purpose of fuel tank venting in aircraft fuel systems?

Accepted Answer

To prevent dangerous pressure or vacuum buildup as fuel is consumed and temperatures change

Answer

To prevent fuel from siphoning when the engine is stopped

Answer

To maintain inlet pressure at the engine-driven fuel pump

Answer

To allow water to drain from the bottom of the fuel tanks

Question 4

During an annual inspection, an IA finds a fuel selector valve that is stiff and requires significant force to move between positions. What is the correct action?

Accepted Answer

Repair or replace the valve before returning the aircraft to service

Answer

Lubricate the valve with engine oil and return the aircraft to service

Answer

Document the condition in the records and advise the owner to monitor it

Answer

Apply Teflon tape to the valve stem to ease operation

Question 5

Which type of contamination poses the greatest immediate risk of engine stoppage in a piston aircraft fuel system?

Accepted Answer

Water contamination

Answer

Particulate matter from tank corrosion

Answer

Microbial growth (dark slime)

Answer

Fuel system sealant residue

Question 6

When inspecting flexible fuel hoses during an annual inspection, which condition requires immediate replacement?

Accepted Answer

Visible cracks, hardening, or deterioration of the outer cover

Answer

Surface crazing visible only under magnification with no through-cracks

Answer

Slight discoloration from normal heat exposure

Answer

Hose installed for more than 5 years regardless of visual condition

Question 7

An IA discovers dark slime (microbial contamination) in an aircraft's integral fuel tanks during an annual inspection. What is the required action before return to service?

Accepted Answer

Clean and treat the tanks per the manufacturer's instructions and applicable ADs

Answer

Drain the tanks, refuel with fresh aviation fuel, and return to service

Answer

Add an FAA-approved biocide additive to the fuel and complete the inspection

Answer

Document the finding and advise the owner to have the tanks treated at next annual