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2 Answers

Aircraft Cosmetic Imperfections and the Go/No-Go Decision

Asked by: 2680 views Aerodynamics, Aircraft Systems, FAA Regulations, Flight Instructor, General Aviation, Private Pilot, Student Pilot

One of the Skyhawks at my flight school has two or three small dents present, one on the leading edge of the right wing and the other on the underside of the fuselage toward the tail. Additionally, minor cracks are present on plastic fairings which cover the strut to wing and main gear to fuselage connection points. It is obvious that many of these cracks have been addressed, and the dents are not so significant that I would believe them to appreciably affect the aerodynamic characteristics of the airplane; however, how much is too much when it comes to aircraft damage? What would you say to a new student on his/her first preflight about when to be concerned? The golden rule of course would be to stay on the ground and ask a mechanic when the slightest level of doubt exists...but what rule of thumb do they use to determine whether a dent or crack renders an aircraft unairworthy? 

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2 Answers



  1. John D Collins on Mar 24, 2021

    In some instances, the aircraft maintenance manual will discuss how to deal with the damage. Another resource is AC 43.13-1B ACCEPTABLE METHODS, TECHNIQUES, AND PRACTICES AIRCRAFT INSPECTION AND REPAIR where one can find general guidance on repairs. It would not be uncommon for a mechanic to seek advice from the manufacturer and provided pictures and reference marks on the damage. Certainly any damage that affects structural members is more concerning than cosmetic only damage. The mechanic that reviews the damaged area is expected to follow industry standards and to use their judgement.

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  2. KDS on Mar 24, 2021

    In some situations, the mechanic will mark a damaged area to indicate it is okay. That way the don’t keep getting called away from other work to reinspect the same defect.

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