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Are aircraft structural units like spars, engine supports, etc., that are built up from sheet metal, repairable?
No, they must be replaced
Yes, but only in emergency situations
Yes, using approved methods
Only with manufacturer's consent
The correct answer is: Yes, using approved methods
Aircraft structural units, such as spars and engine supports, can be repaired using approved methods in most cases. Option A is incorrect because structural units do not always need to be completely replaced in order to make repairs. Option B is incorrect because emergency repairs can often be made using approved methods. Option D is incorrect because aircraft structural units can be repaired with the proper techniques and materials without the manufacturer's consent.