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Halon is used to extinguish fires in the cargo hold, because the sub tance will not damage sensitive equipment. In freighters, the main-deck cargo compartment has a continuou air-sampling system for smoke detection, and the lower cargo compartments have the same systems as the passenger aircraft. There are no fire extinguishers for either the main deck or lower cargo deck. Fire is extinguished by depressurizing the aircraft, wh ich reduce the oxygen needed for combustion. The 767 and 757 fire-detection and extinguishing sy tems are very similar in indication and operation.

The terrifically complex machine you've built does things no other machine can do. 2 billion order for thirty of the new aircraft equipped with Pratt & Whitney JT9D-7R4 engines. 14 August 1978 - Boeing and Aeritalia, Italy's largest aircraft firm. sign a contract; the Italian firm became a risk-sharing major participant of the plane's development and production programme. 22 September 1978 - Civil Transport Development Corp. of Japan becomes a risk-sharing partner. 15 November 1978 - American Airlines and Delta Air Lines announce total firm orders for fifty 767s.

Or as short as 68 miles (1 09km). • The common cockpit type rating permits flight crews trained on the 757 also to fly the 767. • A typical 757 uses more than 1,800 fibreglass blankets to help insulate passengers and cargo from sub-freezing temperatures at high altitudes. 72 ROLLOUT build the plane at Renton, where Boeing could take advantage of a labour pool trained in building narrow-bodies - the 707, 727 and 737 - ::lIld used to turning out high numbers. An area was carved out of the facility to accommodate the 757.