Saab 340 first officer reported finding areas of possible corrosion on the airplane rudder near the ...

Narrative:

During preflight; detected areas of possible corrosion that need to be addressed by maintenance. I have seen it on several rudder assemblies on various aircraft and consider it a general defect that could lead to airworthiness issues to the entire saab 340 fleet.hearing the word 'corrosion' from maintenance is similar to hearing the word 'cancer' from your physician. They're both scary; but I am only talking corrosion in this narrative. I recommended reading advisory circular AC-43-4A entitled 'corrosion control for aircraft;' from the FAA (federal aviation administration) website; www.FAA.gov. According to the document; there are seven forms of corrosion that occur on airframes. It would be best finding all hidden corrosion on aging airframes and have it removed.

Original NASA ASRS Text

Title: Saab 340 First Officer reported finding areas of possible corrosion on the airplane rudder near the trim tab during preflight inspection. Aircraft was removed from service and repaired.

Narrative: During preflight; detected areas of possible corrosion that need to be addressed by Maintenance. I have seen it on several rudder assemblies on various aircraft and consider it a general defect that could lead to airworthiness issues to the entire Saab 340 fleet.Hearing the word 'corrosion' from Maintenance is similar to hearing the word 'cancer' from your physician. They're both scary; but I am only talking corrosion in this narrative. I recommended reading Advisory Circular AC-43-4A entitled 'Corrosion Control for Aircraft;' from the FAA (Federal Aviation Administration) website; www.FAA.gov. According to the document; there are seven forms of corrosion that occur on airframes. It would be best finding all hidden corrosion on aging airframes and have it removed.

Data retrieved from NASA's ASRS site and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.

Attributes
ACN	1629426
Time
Date	201903
Local Time Of Day	1801-2400
Place
Locale Reference	ZZZ.Airport
State Reference	US
Environment
Flight Conditions	VMC
Aircraft 1
Make Model Name	SF 340B
Operating Under FAR Part	Part 121
Flight Phase	Parked
Flight Plan	IFR
Person 1
Function	First Officer Pilot Flying
Qualification	Flight Crew Air Transport Pilot (ATP) Flight Crew Instrument Flight Crew Multiengine
Events
Anomaly	Aircraft Equipment Problem Less Severe

Saab 340 first officer reported finding areas of possible corrosion on the airplane rudder near the trim tab during preflight inspection. Aircraft was removed from service and repaired.