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Consider the following statements about gust loading:

1. The load factor increment varies inversely with wing loading.

2. The alleviation factor accounts for the gust building up gradually.

3. Gust loads never govern the design of a transport wing.

Which of the statements given above is or are correct?

  • A.1 and 3 only
  • B.2 and 3 only
  • C.1, 2 and 3
  • D.1 and 2 only

Answer: D

The first two are correct. The third is false and importantly so: with a manoeuvre limit of only 2.5 g, the gust case frequently governs at cruise speeds, particularly at light weight, which is why both envelopes must be constructed.

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