Powerplant Systems & Components: Engine Exhaust & Reverser Systems 🔊 Flashcards
What are two types of reciprocating engine exhaust systems?
Short stack system and collector system
What are the possible hazards of exhaust system failure?
Carbon monoxide poisoning of crew and passengers or partial or complete loss of engine power and an aircraft fire.
What type of exhaust system is generally used on low powered non supercharged engines?
Short stack system
What type of exhaust system us used on turbocharged engines?
Exhaust collector system
What type of exhaust system creates a high exhaust back pressure?
Collector system
What is the purpose of a reciprocating engine exhaust system?
It is used to remove heat and noxious gases from the engine nacelle
What happens when lead, zinc, or galvanized marks are made on an exhaust system?
The mark is absorber into the metal when heated and causes a change in the molecular structure, weakening the metal
What type of visual indication can usually be seen in the area of an exhaust leak?
Flat grey or sooty black carbon streaks
How are ceramic coated exhaust stacks cleaned?
Degreasing method only
What is the usual cause of muffler and heat exchanger failures?
Concentrated areas of thermal stress or vibration stress
What is the most common form of damage in exhaust systems?
Cracks that are results of repeated expansion and contraction
What should be the position of the waste gate when starting an engine?
Fully open
Where are exhaust manifold and stack failures most likely to occur?
At welds, flanges, or clamped points
What is a common cause of the waste gate unit malfunctioning in a turbocharged system?
Carbon buildup causing the waste gate valve to stick in the closed position
What factors are affected if the area of the exhaust nozzle of a turbine engine is changed?
Engine performance and exhaust gas temperature
Why are thrust reversers not normally used during ground operations?
The danger of blowing foreign objects into the intake
What are the probes in a turbine exhaust pipe used for?
To measure exhaust gas temperature (EGT) and pressure
Why do you disassemble and inspect collector type exhausts?
System failure can result in carbon monoxide poisoning of crew and passengers
What is the purpose of the waste gate on a turbocharged exhaust?
The valve controls the amount of exhaust gases forced through the turbocharger turbine. When the waste gate is fully closed all of the gases must pass through the turbine.
Name two types of thrust reversers.
Mechanical blockage type and aerodynamic blockage type
Can thrust reversers deliver 100% of engine power?
No
What reference do you use when cleaning and inspecting propellers for cracks?
Propeller maintenance manual
