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Byronallen
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what is the Lycoming turbo system critical altitude?
18000 ft
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Why is oil temp so important to watch on startup of a turbo system?
Cold congealed oil with adversely affect wastegate control
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After landing why idle 3-5 minutes before shutting down?
to allow oil to cool the turbo and prevent coking
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When does the differential pressure controller controlling the exaust bypass?
All positions except full throttle
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What controls manifold pressure?
Throttle plate
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What controls turbo above critical altitude (Lycoming) ?
Nothing
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What controls turbo at full throttle on a lycoming system?
Density controller
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What 2 things does a density controller sense?
temperature and pressure
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What device helps increase airflow across the engine?
Exaust augmentor
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What are the 2 controllers on a Lycoming turbo system?
Density and differential pressure controllers
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What is a common way to check exausts?
apply pressure and spray with water then look for bubbling
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What are common places to find cracks on exausts?
welds, bends and slip joints
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2 common defects in exuasts ?
cracks and bulging
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What is used to protect rubber hoses and engine mounts in engine compartments?
Heat deflectors
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What are NA exausts typically made of ? turbo ?
- NA: stainless
- turbo: Inconel
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3 types of exaust joints?
Ball, slip, and asbestos gaskets
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what adjustments are on the differential pressure controller?
none
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what adjustments are on the density controller?
the preload on the bellows can be adjusted
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what are the 2 crucial things to observe when making throttle changes on the turbo lycoming system?
Slow smooth throttle changes and stabilization time
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a wastegate is caleed what on a lycoming system?
exaust bypass valve
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Changes in atmospheric conditions will affect lycoming system? T or F
true
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Oil viscosity affects exaust bypass operation? T or F
true
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Differential pressure controller senses what 2 things?
Upper deck and manifold pressure
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Where is the density controller mounted?
directly on the manifold
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How does the density controller work?
A nitrogen filled brass bellows
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Upper Deck pressure can be referenced to what 5 things?
- fuel pump
- discharge nozzles
- turbo controllers
- fuel flow gauge
- cabin pressurization(sonic venturi)
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What 3 components are adjustable on a TCM turbo system?
- VAPC
- Ratio controller
- Wastegate actuator
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What is used to lubricate wastegate?
Mousemilk
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what system uses a turbine in the exaust to directly add force to the crank?
turbo compound system
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Common things to inspect for on turbo?
- broken or nicked blades
- leaks in oil or air lines
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The altitude where the engine can no longer make rated power?
Critical Altitude
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what is critical altitude on a TCM system?
16000 ft
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what is the turbine housing made of?
cast iron
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What is the compressor housing made of?
Aluminum
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what seals are used in a turbo?
Labrynth
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what kind of bearing is used in a turbo?
plain aluminum bearing
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what is often used to remove oil and prevent coking in a turbo?
scavenge
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what is the restrictor called in the wastegate?
capillary tube
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3 sourses of heat in a turbo?
compression, friction, hot exaust gasses
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device in the intake to cool compressed air with ram air?
intercooler
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a wastegate is spring loaded which way?
open
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What failsafe prevents manifold pressure from building too high in a TCM system?
Pressure relief valve
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what drives wastegate toward closed?
oil pressure
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purpose of the capillary restrictor on the wastegate inlet?
provides fast opening of the wastegate
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2 TYPES of stuperchargers?
internal and external
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what are the 4 components of an induction system?
- air filter
- air intake
- fuel metering device
- intake manifold
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3 types of carb ice?
- impact
- vaporization
- throttle plate
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alternate air door is held closed by?
magnet on spring
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define absolute altitude:
Aircrafts height above ground
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Limiting factors of turbosupercharging?
temperature and pressure
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MAP is measures in ?
Inches of mercury
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APC is calibrated to what?
1" above rated MP
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Upper deck pressure is located between?
Turbo and Throttle plate
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manifold pressure is loacted between?
throttle plated and valves
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The APC uses what 2 pressures?
ambient and UD pressure
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the APC does what ?
maintains a constant manifold pressure
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Ratio controller limits UDP at?
2.2 times ambient pressure
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number one symptom of bootstrapping?
fluctuating MP
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APC and Ratio controller are in series or parellel?
parallel
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when does ratio controller take over?
above critical altitude
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what does the VAPC sense?
UDP
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what does the VAPC do that the APC does not?
any how?
eliminates bootstrapping by having throttle linkage increase or decrease spring pressure on its bellows
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the VAPC is not adjustable? T or F
False VAPC restrictor valve seat is adjustable
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Rate of change controller on TCM system limits the UDP change to?
6.5 in/hg per second
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