rimary Structure, Secondary Structure & their Loading.
rimary Structure, Secondary Structure & their Loading.
(OP)
Two questions really,
No. 1, CS-25 (yeah I'm in Euro Land) makes no mention of "Secondary Structure" but does refer (but not define)to "Primary Structure" Can anybody quote me the definition and origin of Primary and Secondary Structure which doesn't come from the SRM? FAR regs would be acceptable.
And No. 2
As secondary structure is not ruled out in CS-25 Subpart 3, my logic says that CS-25.305 (which is "Strength & Deformation" and equates to FAR 25.305) must also be applied to secondary structure. Can anybody prove different?
Thanks for all comments
No. 1, CS-25 (yeah I'm in Euro Land) makes no mention of "Secondary Structure" but does refer (but not define)to "Primary Structure" Can anybody quote me the definition and origin of Primary and Secondary Structure which doesn't come from the SRM? FAR regs would be acceptable.
And No. 2
As secondary structure is not ruled out in CS-25 Subpart 3, my logic says that CS-25.305 (which is "Strength & Deformation" and equates to FAR 25.305) must also be applied to secondary structure. Can anybody prove different?
Thanks for all comments





RE: rimary Structure, Secondary Structure & their Loading.
as for no. 2 ... a resounding yes.
as for a formal resference for this, i'd look into the FAR ACs
RE: rimary Structure, Secondary Structure & their Loading.
"7. What are the definitions for the common terms used in this AC?
...
b. Primary Structure. Primary structure is that structure which carries flight, ground, or pressurization loads, and whose failure would reduce the structural integrity of the airplane."
RE: rimary Structure, Secondary Structure & their Loading.
Why do you ask?
RE: rimary Structure, Secondary Structure & their Loading.
@SWC Thanks too for your reply, why do I ask? Easy, someone asked me the question and going by CS-25.305 I was fairly sure that there was no special dispensation for secondary structure (not like damaged structure) but thought I'd throw in out in the forum anyway.
RE: rimary Structure, Secondary Structure & their Loading.