Engine Exhaust and Reverser Systems Flashcards
WHAT IS THE PURPOSE OF THE EXHAUST SYSTEM?
Remove high temp. gases and to provide protection against the potentially destructive exhaust gases
NAME TWO TYPES OF RECIPROCATING ENGINE EXHAUST SYSTEMS.
1) Short stack
2) Collector system
WHAT DRAWBACK IN USING COLLECTOR-TYPE EXHAUST SYSTEMS IS MORE THAN OFFSET WHEN USED
ON TURBOCHARGED ENGINES?
The loss of horsepower due to exhaust system back pressure
WHAT COULD RESULT IF THE INTERNAL BAFFLES OR DIFFUSERS IN AN EXHAUST SYSTEM FAIL?
Exhaust gas flow could be restricted, resulting in loss of engine power
WHAT TYPE OF EXHAUST SYSTEM IS USED ON TURBOCHARGED ENGINES?
Collector system
WHAT KIND OF MATERIAL IS NORMALLY USED TO MAKE THE MUFFLER SHROUDS FOUND IN THE
EXHAUST SYSTEM?
Stainless steel
HOW DO YOU INSPECT THE INTERNAL BAFFLES AND DIFFUSERS OF AN EXHAUST SYSTEM?
By disassembling the exhaust system as necessary and visually inspecting the components
WHY IS AN EXHAUST SYSTEM FAILURE CONSIDERED A SEVERE HAZARD?
Can result in carbon monoxide poisoning, loss of engine power, or fire
WHAT COULD HAPPEN IF LEAD, ZINC, OR GALVANIZED MARKS ARE MADE ON AN EXHAUST SYSTEM?
They cause a change in molecular structure, which could result in cracks when heated
WHAT HAPPENS IF THE HEAT EXCHANGER LEAKS EXHAUST GASSES INTO THE INDUCTION SYSTEM?
Loss of engine power
WHAT IS AN INDICATION OF AN EXHAUST GAS LEAK?
A flat gray or sooty black deposit in the area of the leak
WHERE ARE THE MOST COMMON PLACES TO FIND CRACKS IN AN EXHAUST SYSTEM?
1) Welded areas
2) Clamped areas
3) At the flanges
WHAT IS A COMMON CAUSE OF TURBOCHARGER WASTE GATE STICKING?
Coke deposits or carbon buildup
WHY ARE TURBOCHARGED EXHAUST SYSTEM LEAKS VERY DAMAGING AT HIGH ALTITUDES?
Pressure differential will cause the leak to escape with torch-like intensity
WHAT ARE EXHAUST SYSTEM COKE DEPOSITS?
Excessive carbon buildup
WHAT IS THE RESULT OF CHANGING THE EXHAUST NOZZLE AREA OF A TURBINE ENGINE?
The engine’s performance and exhaust gas temperature change
NAME THE COMPONENTS OF A TYPICAL TURBINE EXHAUST NOZZLE.
Tail cone
Exhaust ducts
Support struts
WHAT IS THE PURPOSE OF THRUST REVERSERS
They help decelerate an aircraft after landing
HOW DOES A NOISE SUPPRESSOR FOUND ON OLDER TURBOJET ENGINES WORK?
It converts low frequency sound, which is audible over great distance, into high frequency sound, thus
reducing the sound footprint
WHAT ARE THE TWO MOST COMMONLY USED TYPES OF THRUST REVERSERS?
The clamshell (or mechanically blocked) and the cascade (or aerodynamically blocked)
HOW MUCH THRUST DO THE TRUST REVERSERS PRODUCE COMPARED TO THE ENGINE’S FULL FORWARD THRUST?
Substantially less
WHAT ARE THE HAZARDS OF OPERATING SOME THRUST REVERSERS AT LOW GROUND SPEEDS?
Ingestion of foreign objects stirred up by the exhaust gasses and re-ingestion of hot exhaust gasses.
WHAT HAPPENS TO TURBINE ENGINE PERFORMANCE IF THE EXHAUST NOZZLE AREA IS CHANGED?
The performance and exhaust gas temperature change
WHAT IS THE FUNCTION OF THE THERMOCOUPLE PROBES IN A TURBINE EXHAUST TAILPIPE?
To measure exhaust gas temperature
