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New methods of runway testing

Letters

I am a little surprised that WSP found no data on how pavements behave under aircraft loading (NCE 5/12 August).

Surely I am not mistaken in that the aircraft pavement branch of the old Air Ministry, subsumed into the MPBW then PSA (Directorate of Civil Engineering Development), carried out a lot of work in this field, and the method described was the standard technique for remaking runways.

When it was hoped Concorde would fly to Australia, the pavements on the designated airports en-route were tested.

The testing rig was kept at the Civil Engineering Laboratory at Cardington.

I presume, however, that the old Load Classification Number (LCN) method of designing aircraft pavements has been superseded long ago.

Francis Walley, 13 Julien Road, Coulsdon, Surrey, CR5 2DN

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