ACS Troubleshooting Techniques & Inspection Standards 2

Question 1

When troubleshooting an aircraft hydraulic system that loses pressure only during high-demand operations, what is the most likely cause?

Accepted Answer

Worn hydraulic pump with insufficient flow capacity

Answer

A worn pump may maintain static pressure but fail to deliver sufficient flow under high demand, causing pressure drop during multiple simultaneous actuations.

Question 2

During an annual inspection, you find a crack in an aircraft's aluminum skin near a rivet hole. What is the correct procedure?

Accepted Answer

Measure the crack, determine if it exceeds limits, and consult manufacturer's structural repair manual

Answer

The mechanic must measure the defect, compare it against the manufacturer's allowable limits in the SRM, and follow approved repair procedures.

Question 3

An aircraft engine exhibits black smoke from the exhaust. This symptom most likely indicates:

Accepted Answer

Rich fuel-air mixture or excessive fuel flow

Answer

Black exhaust smoke is a classic indicator of a rich mixture or excessive fuel flow resulting in incomplete combustion.

Question 4

What does a 'red arc' on an aircraft instrument face represent?

Accepted Answer

Never-exceed or maximum limit

Answer

A red arc or red radial line on an instrument denotes a never-exceed speed or maximum operating limit that must not be exceeded.

Question 5

When performing a 100-hour inspection on a reciprocating engine, a mechanic finds the oil consumption has doubled since the last inspection. The most likely cause is:

Accepted Answer

Worn or stuck piston rings

Answer

Worn or stuck piston rings allow oil to enter the combustion chamber and be burned, significantly increasing oil consumption.

(ACS) Airman Certification Standard Certified Mechanic Practice Test

(ACS) Airman Certification Standard Certified Mechanic Practice Test

ACS Troubleshooting Techniques & Inspection Standards 2