torching

torching

The application of a lime mortar under the top edges of roof tiles or slates; in full torching the mortar is applied beneath the entire underside of slates between battens.

McGraw-Hill Dictionary of Architecture and Construction. Copyright © 2003 by McGraw-Hill Companies, Inc.

torching

i. A condition in gas turbine engines in which unburned fuel travels past the turbine, resulting in flames traveling down the jet pipe and often being expelled from the nozzle.
ii. A faulty operation in a reciprocating engine in which unburned fuel travels through the exhaust valve and burns in an exhaust pipe. This is normally because of the excessive richness of the fuel-air mixture. More often than not, a visible flame appears beyond the nozzle.

An Illustrated Dictionary of Aviation Copyright © 2005 by The McGraw-Hill Companies, Inc. All rights reserved