Troubleshooting Techniques & Inspection Standards Flashcards

When using a dial indicator to check crankshaft runout, the total indicated reading (TIR) is 0.006 inches. If the maximum allowable runout is 0.004 inches, what action is required?

Answer: The crankshaft must be replaced or sent to an overhaul facility for evaluation

When TIR exceeds the manufacturer's maximum allowable limit, the crankshaft must be replaced or sent for overhaul evaluation—it cannot be returned to service as-is.

An aircraft landing gear extends normally but the green 'gear down and locked' light does not illuminate. The FIRST troubleshooting step should be:

Answer: Manually verify gear position via the viewing port and check the indicator light bulb

The safest first step is to visually verify gear position via mirror or viewing port, then check if the indicator bulb is burned out before assuming a more serious fault.

What is the purpose of a magnetic particle inspection on steel aircraft components?

Answer: To detect surface and near-surface cracks in ferromagnetic materials

Magnetic particle inspection reveals surface and near-surface discontinuities in ferromagnetic materials by attracting iron particles to areas where magnetic flux leaks at defects.

During an aircraft fuel system inspection, you discover water contamination in the fuel sumps. After draining until clear fuel appears, what additional check is recommended?

Answer: Check the fuel caps and vent systems for leaks that allowed moisture ingress

After removing water contamination, investigate the source by checking fuel caps, vent systems, and any points where water could have entered to prevent recurrence.

A mechanic notices an aircraft's compass reads 10 degrees off during a compass swing. What is the appropriate corrective action?

Answer: Adjust the compensation screws and update the compass correction card

Compass deviation within allowable limits can be corrected by adjusting the compensating magnets and must be documented on an updated compass correction card.

When inspecting control cable tension, you find the elevator cable is at 40 lbs when the maintenance manual specifies 50-70 lbs. What is required?

Answer: Adjust cable tension to within the specified range using the cable turnbuckles

Flight control cables must be adjusted to within the manufacturer's specified tension range using the turnbuckles before the aircraft is returned to service.

Which NDT method is most appropriate for detecting internal voids and delaminations in composite aircraft structures?

Answer: Ultrasonic inspection or tap testing

Ultrasonic testing and tap testing are the primary methods for detecting internal defects such as voids and delaminations in composite structures.