CPL/ATPL knowledge applied. Anti-ice system with bleed air: Bleed air is hot air from the compressor section of the engine. This hot air is used to prevent ice accumulation on flying surfaces and exposed engine parts. Definitions: Anti-ice: the surface is hot, to prevent ice from accumulating De-ice: ice accumulates but is then shed off by pneumatic boots Solenoids / valves: Solenoids are electrical devices that move a valve to an open or closed position. In case of an electrical failure, these valves must move into a safe position. What is safe depends on the function of the valve. Example: an anti-ice valve should be open in case of an electrical failure, to protect the aircraft against ice. A mechanical spring keeps the valve open, the electric solenoid closes it. The technical term is: the anti-ice valve fails to the open position. In the flight manual and checklists you find a summary of the different valves of an in which direction they fail. It makes sense to learn this! This video shows our aircraft returning in flight after an anti-ice valve solenoid failure. Indication: 1) anti ice circuit breaker out 2) engine ITT elevated (bleed air is taken from the engine) In this aircraft there are no specific action items for this. Good system knowledge helps to identify the problem and to keep calm. We have no engine problem here, just a normal condition with the anti-ice valve failed.
Posted on: Sat, 01 Nov 2014 11:53:38 +0000
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