From: email@example.com (Richard Keeling) Organization: Adacel Pty Ltd, Melbourne, Australia Date: 17 Dec 95 14:06:23 References: 1
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The engine pylons on the Boeing 707 housed the cabin air conditioning units. Passenger versions of the B707 had three engine driven air-cycle air-conditioning units in engines 2,3 and 4, the 320C freighter had only two, engines 3 and 4. These units achieved a cabin differentional of 8.6 lbs/sq in. The smaller B720 only required two units as per the freighter versions. The B720 was almost externally identical to the heavier B707s but had a different structure and corresponding lighter operating weights. cheers Richard Keeling.