From kls Mon Aug 5 23:32:57 1996 Newsgroups: sci.aeronautics.airliners Path: bounce-back From: Rob Subject: Re: Procedure after Engine Fire Warning Approved: kls@ohare.Chicago.COM Sender: kls@ohare.Chicago.COM References: Organization: TaC Ltd. Date: 05 Aug 96 23:32:57 Message-ID: In civil airliners such as the B747 the air ducting from the APU to the main distribution manifold, and also the main ducting in the wing leading edges, all have overheat detection wires running parallel to the duct. My experience of the 747 is that the "duct leak" messages (on the 747-400) are fairly common, but normally are a genuine air leak, normally in the "centre duct" section, often in the air conditioning area. Assisted engine starts are allowed in flight, depends on alltitude mainly whether the starter is utilised or windmill start is used. Regards