IA Avionics & Electrical Systems Inspection

Question 1

During an annual inspection, what must an IA verify about an aircraft's pitot-static system?

Accepted Answer

That the system has been tested and inspected within the last 24 calendar months per 14 CFR 91.411 if flown in IFR

Answer

Only that the pitot tube is free of insects and debris

Answer

That the static ports are painted the correct color per aircraft type certificate

Answer

That the system pressure is above 1.5 inches of mercury at sea level

Question 2

What is the IA checking for when inspecting aircraft wiring during an annual?

Accepted Answer

Chafing, overheating signs, corrosion, improper splices, and loose connections

Answer

That all wires are a minimum of 22 AWG

Answer

That wiring runs are color-coded per MIL-SPEC standards

Answer

That all circuits have an in-line fuse within 6 inches of the bus

Question 3

Which document governs the inspection of aircraft electrical systems and wiring?

Accepted Answer

AC 43.13-1B, Chapter 11

Answer

14 CFR Part 23

Answer

TSO-C190

Answer

AC 25.1701-1

Question 4

During an annual inspection of a VFR aircraft, what is required regarding the transponder?

Accepted Answer

It must be tested and inspected every 24 calendar months per 14 CFR 91.413

Answer

No transponder inspection is required for VFR-only aircraft

Answer

The transponder must be replaced every 5 years

Answer

A transponder function check must be entered in the maintenance log every 12 months

Question 5

An IA finds corroded battery terminals in the aircraft battery box during an annual. What is the required action?

Accepted Answer

Clean corrosion, treat with corrosion inhibitor, and verify the battery meets service limits before return to service

Answer

Apply petroleum jelly and return the aircraft to service

Answer

Replace the battery with a new one immediately regardless of its charge state

Answer

Document only and inform the owner for future action

Question 6

What is the IA checking when verifying circuit breaker and fuse sizes during an annual?

Accepted Answer

That each circuit's protection device matches the rated ampacity of the wiring it protects

Answer

That circuit breakers are reset-type only, never fuses

Answer

That all circuit breakers are located within 12 inches of the main battery bus

Answer

That no circuit uses more than 15 amps for avionics equipment