IA Fuel Systems & Hydraulic Systems Inspection 3

Question 1

During an annual inspection of a fuel-injected engine, what critical check is specifically required that does not apply to carbureted engines?

Accepted Answer

Verifying fuel flow divider and injector nozzle condition and flow balance

Answer

Fuel injection systems require specific inspection of the fuel flow divider and individual injector nozzles for proper flow balance between cylinders, which has no equivalent in carbureted engine fuel systems.

Question 2

Regarding age-based replacement of flexible aviation fuel hoses, what is the FAA's universal mandatory replacement interval?

Accepted Answer

There is no single FAA universal interval; the specific aircraft manufacturer's maintenance manual governs

Answer

The FAA has not established a single universal replacement interval for all aviation fuel hoses; the IA must follow the specific aircraft manufacturer's maintenance manual requirements, which vary by aircraft model.

Question 3

An IA finds corrosion pitting in the interior of an aluminum fuel tank during an annual inspection. What determination is required before returning the aircraft to service?

Accepted Answer

Whether the pitting exceeds the manufacturer's acceptable damage limits and structural tolerances

Answer

Corrosion pitting must be evaluated against the aircraft manufacturer's published acceptable damage limits; the IA must determine whether the tank's structural integrity remains within those tolerances before authorizing return to service.

Question 4

What does the designation '100LL' mean when referring to AVGAS 100LL aviation fuel?

Accepted Answer

100 octane anti-knock rating, low lead content relative to the older 100/130 AVGAS formulation

Answer

AVGAS 100LL designates an aviation gasoline with a 100 octane anti-knock rating and 'low lead' content (reduced from the older 100/130 grade), dyed blue for visual identification at fueling.

Question 5

During an annual inspection, the IA notes that the aircraft's wheel brakes feel spongy when the brake pedals are applied during a ground check. What does this most likely indicate?

Accepted Answer

Air trapped in the hydraulic brake lines

Answer

A spongy brake feel is a classic symptom of air trapped in the hydraulic brake lines; because air is compressible (unlike hydraulic fluid), it allows pedal travel without proportional brake application force.

IA - Inspection Authorization Certification Practice Test

IA - Inspection Authorization Certification Practice Test

IA Fuel Systems & Hydraulic Systems Inspection 3