If the 747 was a BA aircraft then I saw the same film. The slides were rated to approx 25-35kts, but operated satisfactorily in a wind of 50-60kts. The company promptly cancelled an order for slides rated up to 50 kts saving about £250K. The skippers reward for saving a 747 and £250K for the compnay was a £20 dinner voucher!
