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Hi, As per the document "Fatigue evaluation of wing and associated structure on small airplanes. Federal Aviation Administration Rept. DOT-FAA-AFS-120-73-2, Washington DC, 1973.", The total fatigue damage calculation involves Gust, Maneuver, Landing and Taxi and also GAG cycle. In GAG cycle is...

Thank you all for this lively discussion. My question is related to PART 23 class aircraft landing gear. I am a starter in this area and my understanding/Queries as of now is 1. Fatigue life and damage tolerance life, both have to be established for the structure 2. Landing gear is designed as...

Thank you

Related to any literature on how to arrive at the SD or if a particular number for scatter factor is to be used, where can I find it? If we want to certify a product, we have to provide references. It is challenging to convince the authority that we may use 3 or 4 or any other number. Thank you

Hi, Thank you. Please share any references when you find some time.

Thank you for your reply. However, AC 23-13 A says about " Standard Deviation (SD) of Log Fatigue Life for Built-up Structures Constructed of Common Structural Metals". How do get these SD. Is it from material test alone. Again, in S-N curve, we may have different SD at different stress levels...

Hi rb1957, It is given in the 23-13 itself, for various materials, it has been in the range of 14% (Aluminum) to 25% (High strength steel)

Hi, as per AC 23-13 A, Eq.4 provides a scatter factor to account for the statistical variability inherent in the fatigue performance of built-up structures. As per the same, the standard deviation to be used for high strength steels like one used in landing gear are to be 25% and, the scatter...

Hi, Recently, I was reading through AC23-13A. The exceedance curves are normalized with Incremental Design Limit Maneuver Load Factor at Maximum Gross Weight (anLff) to get Incremental Maneuver Load Factor at Operating Weight (an). What is the meaning here of the word incremental in anlff? Is...

Hi, I am started to work in the area of aircraft fatigue life estimation and please help me with the following: I have few questions regarding fatigue life estimation of metallic aircraft components. Let say, The life can be computed using S-N curves (from MMPDS) and Miners damage under given...