NATOPS Chapter 2 Engine HSM-50 Flashcards
Indications of Impending High Speed Shaft Failure
high-intensity, medium to high freq vibs (may vary with movement of PCL)
howl
With high speed shaft failure, Np is __ than Nr by more than __; torque will be ___
greater, 3%
below 10%
Altitude required for dual engine restart
5000 ft AGL
Indications of Malfunctioning Engine Anti-Ice/Start Bleed
- Appearance or disappearance of ENG ANTI-ICE ON advisory when outside of range specified (80.5% to 96.5% Ng)
- No ENG ANTI-ICE ON when ENG ANTI-ICE switch on
- No rise in TGT when ENG ANTI-ICE ON
MH-60R Engine
T700-GE-401C front drive turboshaft
5 sections of engine
inlet, compressor, combustor, turbine, exhaust
Airflow/mechanical energy through engine
inlet cowling –> swirl vanes –> collection scroll –> scroll vanes (in collection scroll) –> overboard through blower assembly or to deswirl vanes –> compressor –> combustor –> Ng turbine –> Np turbine –> high speed shaft –> input module –> xsmn
inlet anti-ice valve uses ___ and works by __
5th stage bleed air; heating exposed inlet surface with the hot air
swirl vanes are hollow to permit passage of
5th stage bleed air via engine anti-ice valve for anti-icing purposes
purpose of IPS
prevent foreign particles from entering compressor
compressor
five stage axial and single stage centrifugal rotor/stator assembly
combustion section
flow through, annular combustion chamber, two igniters, 12 fuel injectors
Fuel injectors receive fuel from __ and supply __
ODV; atomized fuel for combustion
Ng turbine drives
compressor and AGB
Ng turbine is
two stage, air cooled, high performance axial design
Np turbine
2 stages that turn power turbine drive shaft
power turbine drive shaft
coaxial, turning inside Ng turbine drive shaft
drives high speed shaft which is connected to input module
Engine Airflow usage
30% for combustion, 70% for:
- T2
- P3
- Combustor and turbine cooling
- Engine oil seal pressurization
T2
compressor inlet temp air
P3
compressor discharge pressure air
AGB mounts to __; front and rear faces provide drive pads for
rear of main frame at 12 oclock position, above scroll case
rear face: engine starter, HMU, IPS blower, ODV
front face: alternator and engine driven fuel boost pump
AGB is driven by
a rotor via a radial drive shaft from Ng turbine drive shaft
Describe airflow through the engine
inlet cowling - swirl vanes - collection scroll - [IPS - overboard through blower assembly] - deswirl vanes - compressor - Ng turbine - Np turbine