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Allison T56-A-15 Engine Part 8 This lesson covers the Engine Starting systems. Issue 1.

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Presentation on theme: "Allison T56-A-15 Engine Part 8 This lesson covers the Engine Starting systems. Issue 1."— Presentation transcript:

1 Allison T56-A-15 Engine Part 8 This lesson covers the Engine Starting systems. Issue 1

2 Engine Starting E S DC GTC Starter valve BASOV Starter valve solenoid Fire shut-off valves Norm Pulled Start circuits ‘T’ Handle Start button Ground start interlock relay Start control Oil control ATM under-freq lock-out relay Nacelle pre-heat Engine anti-icing solenoid NRVs

3 Engine Starting E S DC GTC Starter valve BASOV Starter valve solenoid Fire shut-off valves Norm Pulled Start circuits ‘T’ Handle Start button Ground start interlock relay Start control Oil control ATM under-freq lock-out relay Nacelle pre-heat Engine anti-icing solenoid NRVs

4 ATM Gen Control C C C AØ BØ CØ ATM Gen { From K6 ESS AC Bus bar ATM Gen Contactor Relay C C C OUT ATM Gen Out Light Power Indicator Relay E S DC RESETOFF FIELD TRIP ON ATM Gen Out Light TRU volt reg ATM Freq Sens Relay K10 RESET OFF ON FIELD TRIP FIELD TRIP TRIP COIL RESET COIL OVRDPR GRND FAULT SENSE COILS GRND FAULT SENSE CCT OVERVOLT SENSE CIRCUIT ESS AC OFF TRU ATM Gen Control AC Bus-Off Lights ESS AC Bus-Off Indicator Relay DC K9 C C C Ext AC Power Relay C C C Start Buttons Low Freq Time Delay Low Freq Lock-out Relay 5 sec ESSENTIAL DC BUS BAR I S O L A T E D DC RESET Manual reset

5 Under-frequency Lockout C C C AØ BØ CØ ATM Gen { From K6 ESS AC Bus bar ATM Gen Contactor Relay C C C OUT ATM Gen Out Light Power Indicator Relay E S DC RESETOFF FIELD TRIP ON ATM Gen Out Light TRU volt reg ATM Freq Sens Relay K10 RESET OFF ON FIELD TRIP FIELD TRIP TRIP COIL RESET COIL OVRDPR GRND FAULT SENSE COILS GRND FAULT SENSE CCT OVERVOLT SENSE CIRCUIT ESS AC OFF TRU ATM Gen Control AC Bus-Off Lights ESS AC Bus-Off Indicator Relay DC K9 C C C Ext AC Power Relay C C C Start Buttons Low Freq Time Delay Low Freq Lock-out Relay 5 sec ESSENTIAL DC BUS BAR I S O L A T E D DC RESET Manual reset 57(R) Sqn 5

6 The starter valve opens slowly to progressively load the GTC. The starter valve limits air pressure to the starter motor turbine to 54 psi. The starter motor drives through a dog clutch and the prop brake into the reduction gearbox. Confirm starter valve closure by reference to bleed air manifold pressure gauge and engine TIT cut-back during subsequent starts. Engine Starting

7 Starting-Run, <16% I S O L DC E S DC MOTOR TOUCHDOWN RELAY IGNITION CONTROL SECONDARY PUMP INDICATOR LIGHT SECONDARY FUEL PUMP PRESSURE WARNING LIGHT SECONDARY PUMP PRESSURE SWITCH SPEED SENSE CONTROL IGNITION EXCITER IGNITER PLUGS PARALLELING VALVE MANIFOLD DRAIN VALVE FUEL MANIFOLD PRESSURE SWITCH IGNITION RELAY FUEL ENRICHMENT RELAY FUEL ENRICHMENT VALVE FUEL ENRICHMENT SWITCH OFF NORMAL CONDITION LEVER TOUCHDOWN SWITCHES GROUND STOP RELAY GRND. ST. SW. AIR GRND FEA & FUEL S. OFF SW. AIR START SW. OPEN CLOSE   TO FEATHER CONTROL BOX 28 VOLTS ESS DC TO FEATHER PUMP CONTROL RELAY

8 Starting-Run, >16%, 16%, <65% I S O L DC E S DC MOTOR TOUCHDOWN RELAY IGNITION CONTROL SECONDARY PUMP INDICATOR LIGHT SECONDARY FUEL PUMP PRESSURE WARNING LIGHT SECONDARY PUMP PRESSURE SWITCH SPEED SENSE CONTROL IGNITION EXCITER IGNITER PLUGS PARALLELING VALVE MANIFOLD DRAIN VALVE FUEL MANIFOLD PRESSURE SWITCH IGNITION RELAY FUEL ENRICHMENT RELAY FUEL ENRICHMENT VALVE FUEL ENRICHMENT SWITCH OFF NORMAL CONDITION LEVER TOUCHDOWN SWITCHES GROUND STOP RELAY GRND. ST. SW. AIR GRND FEA & FUEL S. OFF SW. AIR START SW. OPEN CLOSE   TO FEATHER CONTROL BOX 28 VOLTS ESS DC TO FEATHER PUMP CONTROL RELAY

9 Starting-Run, >16%, 16%, <65% I S O L DC E S DC MOTOR TOUCHDOWN RELAY IGNITION CONTROL SECONDARY PUMP INDICATOR LIGHT SECONDARY FUEL PUMP PRESSURE WARNING LIGHT SECONDARY PUMP PRESSURE SWITCH SPEED SENSE CONTROL IGNITION EXCITER IGNITER PLUGS PARALLELING VALVE MANIFOLD DRAIN VALVE FUEL MANIFOLD PRESSURE SWITCH IGNITION RELAY FUEL ENRICHMENT RELAY FUEL ENRICHMENT VALVE FUEL ENRICHMENT SWITCH OFF NORMAL CONDITION LEVER TOUCHDOWN SWITCHES GROUND STOP RELAY GRND. ST. SW. AIR GRND FEA & FUEL S. OFF SW. AIR START SW. OPEN CLOSE   TO FEATHER CONTROL BOX 28 VOLTS ESS DC TO FEATHER PUMP CONTROL RELAY

10 >16%, 50psi I S O L DC E S DC MOTOR TOUCHDOWN RELAY IGNITION CONTROL SECONDARY PUMP INDICATOR LIGHT SECONDARY FUEL PUMP PRESSURE WARNING LIGHT SECONDARY PUMP PRESSURE SWITCH SPEED SENSE CONTROL IGNITION EXCITER IGNITER PLUGS PARALLELING VALVE MANIFOLD DRAIN VALVE FUEL MANIFOLD PRESSURE SWITCH IGNITION RELAY FUEL ENRICHMENT RELAY FUEL ENRICHMENT VALVE FUEL ENRICHMENT SWITCH OFF NORMAL CONDITION LEVER TOUCHDOWN SWITCHES GROUND STOP RELAY GRND. ST. SW. AIR GRND FEA & FUEL S. OFF SW. AIR START SW. OPEN CLOSE   TO FEATHER CONTROL BOX 28 VOLTS ESS DC TO FEATHER PUMP CONTROL RELAY

11 >16%, 150psi I S O L DC E S DC MOTOR TOUCHDOWN RELAY IGNITION CONTROL SECONDARY PUMP INDICATOR LIGHT SECONDARY FUEL PUMP PRESSURE WARNING LIGHT SECONDARY PUMP PRESSURE SWITCH SPEED SENSE CONTROL IGNITION EXCITER IGNITER PLUGS PARALLELING VALVE MANIFOLD DRAIN VALVE FUEL MANIFOLD PRESSURE SWITCH IGNITION RELAY FUEL ENRICHMENT RELAY FUEL ENRICHMENT VALVE FUEL ENRICHMENT SWITCH OFF NORMAL CONDITION LEVER TOUCHDOWN SWITCHES GROUND STOP RELAY GRND. ST. SW. AIR GRND FEA & FUEL S. OFF SW. AIR START SW. OPEN CLOSE   TO FEATHER CONTROL BOX 28 VOLTS ESS DC TO FEATHER PUMP CONTROL RELAY

12 Fuel Pumps PARALLEL SERIES

13 >16%, >65%, Fuel Px 16%, >65%, Fuel Px <150psi I S O L DC E S DC MOTOR TOUCHDOWN RELAY IGNITION CONTROL SECONDARY PUMP INDICATOR LIGHT SECONDARY FUEL PUMP PRESSURE WARNING LIGHT SECONDARY PUMP PRESSURE SWITCH SPEED SENSE CONTROL PARALLELING VALVE MANIFOLD DRAIN VALVE FUEL MANIFOLD PRESSURE SWITCH IGNITION RELAY FUEL ENRICHMENT RELAY FUEL ENRICHMENT VALVE FUEL ENRICHMENT SWITCH OFF NORMAL CONDITION LEVER TOUCHDOWN SWITCHES GROUND STOP RELAY GRND. ST. SW. AIR GRND FEA & FUEL S. OFF SW. AIR START SW. OPEN CLOSE   TO FEATHER CONTROL BOX 28 VOLTS ESS DC TO FEATHER PUMP CONTROL RELAY IGNITION EXCITER IGNITER PLUGS

14 Ground Stop I S O L DC E S DC MOTOR TOUCHDOWN RELAY IGNITION CONTROL SECONDARY PUMP INDICATOR LIGHT SECONDARY FUEL PUMP PRESSURE WARNING LIGHT SECONDARY PUMP PRESSURE SWITCH SPEED SENSE CONTROL IGNITION EXCITER IGNITER PLUGS PARALLELING VALVE MANIFOLD DRAIN VALVE FUEL MANIFOLD PRESSURE SWITCH IGNITION RELAY FUEL ENRICHMENT RELAY FUEL ENRICHMENT VALVE FUEL ENRICHMENT SWITCH OFF NORMAL CONDITION LEVER TOUCHDOWN SWITCHES GROUND STOP RELAY GRND. ST. SW. AIR GRND FEA & FUEL S. OFF SW. AIR START SW. OPEN CLOSE   TO FEATHER CONTROL BOX 28 VOLTS ESS DC TO FEATHER PUMP CONTROL RELAY

15 Ground Stop I S O L DC E S DC MOTOR TOUCHDOWN RELAY IGNITION CONTROL SECONDARY PUMP INDICATOR LIGHT SECONDARY FUEL PUMP PRESSURE WARNING LIGHT SECONDARY PUMP PRESSURE SWITCH SPEED SENSE CONTROL IGNITION EXCITER IGNITER PLUGS PARALLELING VALVE MANIFOLD DRAIN VALVE FUEL MANIFOLD PRESSURE SWITCH IGNITION RELAY FUEL ENRICHMENT RELAY FUEL ENRICHMENT VALVE FUEL ENRICHMENT SWITCH OFF NORMAL CONDITION LEVER TOUCHDOWN SWITCHES GROUND STOP RELAY GRND. ST. SW. AIR GRND FEA & FUEL S. OFF SW. AIR START SW. OPEN CLOSE   TO FEATHER CONTROL BOX 28 VOLTS ESS DC TO FEATHER PUMP CONTROL RELAY

16 Enrich. Start-Run, <16% I S O L DC E S DC MOTOR TOUCHDOWN RELAY IGNITION CONTROL SECONDARY PUMP INDICATOR LIGHT SECONDARY FUEL PUMP PRESSURE WARNING LIGHT SECONDARY PUMP PRESSURE SWITCH SPEED SENSE CONTROL IGNITION EXCITER IGNITER PLUGS PARALLELING VALVE MANIFOLD DRAIN VALVE FUEL MANIFOLD PRESSURE SWITCH IGNITION RELAY FUEL ENRICHMENT RELAY FUEL ENRICHMENT VALVE FUEL ENRICHMENT SWITCH OFF NORMAL CONDITION LEVER TOUCHDOWN SWITCHES GROUND STOP RELAY GRND. ST. SW. AIR GRND FEA & FUEL S. OFF SW. AIR START SW. OPEN CLOSE   TO FEATHER CONTROL BOX 28 VOLTS ESS DC TO FEATHER PUMP CONTROL RELAY

17 Enrich. Start >16%, 16%, <65% I S O L DC E S DC MOTOR TOUCHDOWN RELAY IGNITION CONTROL SECONDARY PUMP INDICATOR LIGHT SECONDARY FUEL PUMP PRESSURE WARNING LIGHT SECONDARY PUMP PRESSURE SWITCH SPEED SENSE CONTROL IGNITION EXCITER IGNITER PLUGS PARALLELING VALVE MANIFOLD DRAIN VALVE FUEL MANIFOLD PRESSURE SWITCH IGNITION RELAY FUEL ENRICHMENT RELAY FUEL ENRICHMENT VALVE FUEL ENRICHMENT SWITCH OFF NORMAL CONDITION LEVER TOUCHDOWN SWITCHES GROUND STOP RELAY GRND. ST. SW. AIR GRND FEA & FUEL S. OFF SW. AIR START SW. OPEN CLOSE   TO FEATHER CONTROL BOX 28 VOLTS ESS DC TO FEATHER PUMP CONTROL RELAY

18 Enrich. Start >16%, 16%, <65% I S O L DC E S DC MOTOR TOUCHDOWN RELAY IGNITION CONTROL SECONDARY PUMP INDICATOR LIGHT SECONDARY FUEL PUMP PRESSURE WARNING LIGHT SECONDARY PUMP PRESSURE SWITCH SPEED SENSE CONTROL IGNITION EXCITER IGNITER PLUGS PARALLELING VALVE MANIFOLD DRAIN VALVE FUEL MANIFOLD PRESSURE SWITCH IGNITION RELAY FUEL ENRICHMENT RELAY FUEL ENRICHMENT VALVE FUEL ENRICHMENT SWITCH OFF NORMAL CONDITION LEVER TOUCHDOWN SWITCHES GROUND STOP RELAY GRND. ST. SW. AIR GRND FEA & FUEL S. OFF SW. AIR START SW. OPEN CLOSE   TO FEATHER CONTROL BOX 28 VOLTS ESS DC TO FEATHER PUMP CONTROL RELAY

19 >16%, 50psi I S O L DC E S DC MOTOR TOUCHDOWN RELAY IGNITION CONTROL SECONDARY PUMP INDICATOR LIGHT SECONDARY FUEL PUMP PRESSURE WARNING LIGHT SECONDARY PUMP PRESSURE SWITCH SPEED SENSE CONTROL IGNITION EXCITER IGNITER PLUGS PARALLELING VALVE MANIFOLD DRAIN VALVE FUEL MANIFOLD PRESSURE SWITCH IGNITION RELAY FUEL ENRICHMENT RELAY FUEL ENRICHMENT VALVE FUEL ENRICHMENT SWITCH OFF NORMAL CONDITION LEVER TOUCHDOWN SWITCHES GROUND STOP RELAY GRND. ST. SW. AIR GRND FEA & FUEL S. OFF SW. AIR START SW. OPEN CLOSE   TO FEATHER CONTROL BOX 28 VOLTS ESS DC TO FEATHER PUMP CONTROL RELAY

20 Enrichment Burner Manifold Pressure switch pick-off Enrichment valve Enrichment burst fuel path

21 Use of Enrichment The enrichment starting procedure is only used for the second starting attempt if either an airborne or cold weather start has failed and the residual TIT is below 100 o C.


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