Engine

Question 1

Indications of Impending High Speed Shaft Failure

Answer 1

high-intensity, medium to high freq vibs (may vary with movement of PCL)
howl

Question 2

With high speed shaft failure, Np is __ than Nr by more than __; torque will be ___

Answer 2

greater, 3%

below 10%

Question 3

Altitude required for dual engine restart

Answer 3

5000 ft AGL

Question 4

Indications of Malfunctioning Engine Anti-Ice/Start Bleed

Answer 4

1. ENG ANTI-ICE ON with > 90% Ng or > 94% Ng if OAT is 15 deg C or greater
2. No ENG ANTI_ICE ON when Ng < 88% Ng (Ng may vary on sliding scale with OAT)
3. No ENG ANTI-ICE ON when ENG ANTI-ICE switch on
4. No rise in TGT when ENG ANTI-ICE ON

Question 5

MH-60R Engine

Answer 5

T700-GE-401C front drive turboshaft

Question 6

5 sections of engine

Answer 6

inlet, compressor, combustor, turbine, exhaust

Question 7

Airflow/mechanical energy through engine

Answer 7

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

Question 8

inlet anti-ice valve uses ___ and works by __

Answer 8

5th stage bleed air; heating exposed inlet surface with the hot air

Question 9

swirl vanes are hollow to permit passage of

Answer 9

5th stage bleed air via engine anti-ice valve for anti-icing purposes

Question 10

purpose of IPS

Answer 10

prevent foreign particles from entering compressor

Question 11

compressor

Answer 11

five stage axial and single stage centrifugal rotor/stator assembly

Question 12

combustion section

Answer 12

flow through, annular combustion chamber, two igniters, 12 fuel injectors

Question 13

Fuel injectors receive fuel from __ and supply __

Answer 13

ODV; atomized fuel for combustion

Question 14

Ng turbine drives

Answer 14

compressor and AGB

Question 15

Ng turbine is

Answer 15

two stage, air cooled, high performance axial design

Question 16

Np turbine

Answer 16

2 stages that turn power turbine drive shaft

Question 17

power turbine drive shaft

Answer 17

coaxial, turning inside Ng turbine drive shaft

drives high speed shaft which is connected to input module

Question 18

Engine Airflow usage

Answer 18

30% for combustion, 70% for:

1. T2
2. P3
3. Combustor and turbine cooling
4. Engine oil seal pressurization

Question 19

T2

Answer 19

compressor inlet temp air

Question 20

P3

Answer 20

compressor discharge pressure air

Question 21

AGB mounts to __; front and rear faces provide drive pads for

Answer 21

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

Question 22

AGB is driven by

Answer 22

a rotor via a radial drive shaft from Ng turbine drive shaft

Question 23

Describe airflow through the engine

Answer 23

inlet cowling - swirl vanes - collection scroll - [IPS - overboard through blower assembly] - deswirl vanes - compressor - Ng turbine - Np turbine