Uh60 Engine Start

Front 1

Discribe the UH60 engine start system

Back 1

The engine start system is an electro-pneumatic system used to start both engines.

Front 2

What is the caution that pertains to moving the engine PCL while pressing the starter button

Back 2

To aviod damage to the engine start switch actuators, do not mover the EPCL from IDLE to OFF while pressing the starter button

Front 3

What is the auto start circut?

Back 3

During acceleration to idle, a speed sensor on the starter feeds the Ng speed information to the speed switch

Front 4

The speed switch commands the starter valve to open until the Ng speed reaches a minimum of what % NG

Back 4

52% NG

Front 5

Between __% and __% NG the start valve will close extinguishing the starter caution light.

Back 5

52%- 65%

Front 6

How does a pilot abort an auto start sequence?

Back 6

By pulling down on the PCL. This actuates the abort start switch and closes the starter air valve.

Front 7

How does a pilot complete a manual start?

Back 7

By pressing and holding the starter button during the start process, and releasing the button when the NG speed reaches a minimum of 52% NG.

Front 8

What are 3 ways to provide air for Engine Starts

Back 8

APU, Crossbleed, Ground Source.

Front 9

What does the APU do for the engine start?

Back 9

The APU supplies air to the engine selected for engine start. (turbomach and Garrett are the two types of APUS.)

Front 10

Can an Engine start be accomplished with the APU air source availalble but NO AC power from the APU Gen?

Back 10

Yes, If the battery is the sole source of DC power, and an air source is available( i.e. the APU available, but the APU gen is inop), only the #1 engine may be started.

Front 11

What is the #1 engine start valve powered by?

Back 11

The #1 engine start valve is powered by the DC essential bus, and no instruments will operate until the AC power becomes available.

Front 12

What is the #2 enigine start valve powered by?

Back 12

The #2 engine start vavle is powered by the #2 primary bus, and requireds an operaitonal main or APU gen, or and external power source.

Front 13

What happens when a pilot presses the #1 engine starter button?

Back 13

Pressing the #1 engine starter button opens the #1 engine start valve, allowing air supplied by the APU to enter the #1 starter and the #1 Engine.

Front 14

What valve is utilized to complete a cross bleed start?

Back 14

Cross bleed starting utilizes the bleed-air shutoff vavle to direct air from the operating engine to the opposite engine during the start sequence. Starting one engine from the other (cross bleed start) is the same as starting an engine using the APU as the air source, except the AIR SOURCE HEAT/START switch will be in the ENG position.

Front 15

During a Cross bleed start, were does the pressure come from to start the other engine.

Back 15

Pressure from the running engine compressor is used to start the other engine.

Front 16

What are the requirments to accomplish a Cross Bleed start?

Back 16

To accomplish a Cross Bleed Start, the running engine should be at 90% NG with the RPMR at 100%, and the engine anti-Ice advisory light off.

Front 17

During a crossbleed start why might you have to raise the collective?

Back 17

The collective may have to be raised to increase the NG to 90% as an 18% loss of the Maximum TQ available on the air source engine will be experienced during the start sequence.

Front 18

Why would you want to use the APU during an in flight engine start?

Back 18

A cross bleed start in flight may decrease the max TQ available from the running engine by as much as 18%. Therefore, the APU should be used.

Front 19

What is an AGPU used for?

Back 19

The AGPU is an external air source used for engine starting.

Front 20

What are 2 sources of external engine starts?

Back 20

Aircraft to Aircraft (buddy Start) and AGPU

Front 21

Where does the pneutic tubing start and end?

Back 21

The pneumatic tubing and manifold used during the engine start sequence, extends from the left side of the transmission sectoin throughout the cabin suction upper deck area forward to the heater.

Front 22

What is the first section of the pneumatic tubing and what does it do?

Back 22

The first seciton of the pneumatic tubing is the nipple check valve. The nipple check vavle provides a connection point for external air source.

Front 23

Name all of the sections of pneumatic tubing in sequence.

Back 23

Lower tube, middle tube, upper tube, front tube, cross bleed tube, and the APU compartment front tube connects to the cross bleed tube.

Front 24

Discribe the Pneumatic tubing.

Back 24

The pneumatic tubing consists of a series of coupled or welded tubes joined together so any one of the air sources may provide bleed air for whatever reason depending on demend.

Front 25

Discribe the pneumatic system.

Back 25

The pneumantic system is comprised of a series of tubing and valves that distribute compressed air to bleed air dependant systems.

Front 26

Pneumatic tubing is not allowed any dents that exceed __% of the total diameter of the tube in question.

Back 26

25%

Front 27

Are cracks allowed on pneumatic tubes or joints?

Back 27

NO

Front 28

Where are the starter contol Valves located

Back 28

the start control valves are located inside the oil cooler compartment, inboard of each respective engines firewall.

Front 29

The start control valves are _______ controled and ___ ______ to allow bleed air to flow through to the engine starter.

Back 29

The start control valves are electrically controlled and air actuated to allow bleed air to flow through to the engine starter.

Front 30

When the starter button is pressed, the start control valve is electrically opened by the ______ ______.

Back 30

When the starter button is pressed, the start control valve is electrically opened by the solenoid valve.

Front 31

What happens when the start control valve is opened?

Back 31

Opening the start control valve released compressed air from the air source to the air turbine starter of the engine being started. The air entering the start control valve is filter to remove impurities as it passes through the start control valve.

Front 32

Both start contol valves require __-__ psi bleed air to actuate.

Back 32

Both start contol valves require 27-31 psi bleed air to actuate.

Front 33

The __ ______ ____ (#1 start system) provides voltage through the #1 ___ ______ circut breaker to ____ relay in the left relay panel to energise the #1 engine start control valve.

Back 33

The DC ESNTL BUS (#1 start system) provides voltage through the #1 ENG Start circut breaker to K45 relay in the left relay panel to energise the #1 engine start control valve. This voltage is removed during start sequence by pulling down on the #1 EPCL.

Front 34

The __ __ _____ ____ (#2 Start system) provides voltage through the #2 _____ ____ _____ circut breaker, to ___ relay in the right relay panel, to energize the #2 engine start control valve.

Back 34

The #2 DC PRI BUS (#2 Start system) provides voltage through the #2 ENG Start CONTROL circut breaker, to K26 relay in the right relay panel, to energize the #2 engine start control valve. This Voltage is removed during start sequence by pulling down on the #2 EPCL.

Front 35

Where are the Bleed Air shut off valves located?

Back 35

The bleed air shut-off valves are located inside the oil cooler compartment below the start control valves.

Front 36

Describe the bleed-air shut off valve.

Back 36

The bleed air shut off valves are electrically controlled and air actuated to allow bleed-air to flow through the pressurize the entire pneumatic manifold.

Front 37

The bleed-air shutoff valve is _________ actuated and ____________ opened.

Back 37

The bleed-air shutoff valve is electrically actuated and pneumatically opened. An electric solenoid allows the bleed-air valve to poen when air is being forced out.

Front 38

What prevents the bleed-air valve and start control valve from being opened at the same time.

Back 38

The start relays prevent the bleed-air valve and start control valve from being opened at the same time.

Front 39

Power to the bleed-air shutoff valve is provided by the___ ____ _____ _____, through the Air Source Heat Start switch and the respective start relay.

Back 39

Power to the bleed-air shutoff valve is provided by the #1 DC PRI BUS, through the Air Source Heat Start switch and the respective start relay.

Front 40

What is the APU check Valve?

Back 40

The APU check valve is a one-way check valve that allows the apu to pressurize the pneumatic manifold, but prevents air from being forced back through the APU when it is not operating.

Front 41

Where is the APU check valve located?

Back 41

The APU check valve is located on the lower left hand side of the APU just forward of the firewall for the APU.

Front 42

What is an APU start bypass valve?

Back 42

The APU start bypass valve is an electrically actuated valve that allows excess air to be dumped overboard until need for engine start. The valve opens to unload the compressor during the start sequence, preventing compressor stalls.

Front 43

What controls the APU start bypass valve?

Back 43

The APU start bypass vavle is controlled by the APU Electronic Sequence Unit (ESU) and relay K22 in the right relay panel.

Front 44

Where is the #1 Starter located?

Back 44

The #1 engine starter is located on the accessory gearbox inner side near the firewall.

Front 45

Where is the #2 Starter located?

Back 45

The #2 engine starter is located on the accessory gearbox outer side.

Front 46

What does the Air turbine starter do?

Back 46

The Air turbine starter converts pneumatic air pressure into mechanical force that turns the engine's accessory drive and NG section.

Front 47

What is the purpose of the air turbine starter's Shear Shaft?

Back 47

The starter has a small shear shaft, which allows the engines accessory drive to continue to rotate in the event the starter seizes up.

Front 48

What is the purpose of the magnetic speed sensor on the air turbine starter?

Back 48

The speed sensor is located on the engine starter and provides an AC signal, proportional to engine speed, this signal is fed to the speed switch (auto-start circut) to effect starter dropout between 52-65% NG.

Front 49

When does the Air turbine starter decouple from the AGB and PTO?

Back 49

The pneumatic stater is powered by bleed air, it motors the NG section via the AGB and PTO. It decouples (via internal clutch) when engine RPM is greater than starter.

Front 50

Why do starter limitations exist?

Back 50

Starter limitations exist because the bleed air powering it is HOT (400 F) and can damage the starter if exposure time is excessive.

Front 51

What is the Starter Switch?

Back 51

The starter switch is a micro switch that is activated by the retarded engines power control levers starter button. When pressed, the starter switch allows voltage to pass through to energize the start relay.

Front 52

What is the over ride switch?

Back 52

The over switch is adjusted to allow activation by the start button if activated. This switch and the starter switch can be activated either together (PCL Retarded) or seperately (PCL Idle) in the event of a starter that will not stay engaged. It allows voltage to pass through the energize the start relays and also to light the starter caution light (false start light).

Front 53

Where is the abort switch.

Back 53

The Abort switch is located on the forward side of the EPCL

Front 54

What does the Abort switch do?

Back 54

The abort switch is a micro switch that is adjusted to allow activation when the PCL is pulled down. Acitivation of the abort switch removes voltage from the start relays and ultimately the start control valve. The abort switch will activate regardless of PCL positon.

Front 55

Where is the starter speed switch located?

Back 55

The starter speed switch is located in the upper cabin area above the left-hand gunners station.

Front 56

What does the starter speed switch do?

Back 56

As engine speed increases, the speed pickup sensor produces an ac signal that electrically energizes the starter speed switch, holding the engine start relay in the energized positon.

Front 57

At what Ng speed does the starter switch deactivate, and what does it do?

Back 57

52-65%NG, closes the engine starter control valve.

Front 58

The Starter speed switch performs the AUTO HOLD FUNCTION of the engine start system by using signals from the?

Back 58

The Starter speed switch performs the AUTO HOLD FUNCTION of the engine start system by using signals from the speed sensors and voltage from the start control valves.

Front 59

If the Keylock ignition switch is in the OFF position, do motoring capabilities remain?

Back 59

Yes.

Front 60

What happens when the Engine Ignition switch is placed in the ON position?

Back 60

When the ENGINE IGNITION switch is in the ON position, the short is removed from both engine alternators, allowing current flow to the ignition exciter and to the igniter plugs.

Front 61

Where is the #1 engine starter relay and what is the relay #.

Back 61

The #1 engine starter relay (k45) is located in the left relay panel.

Front 62

Where is the #2 engine starter relay and what is the relay #?

Back 62

The #2 engine starter relay (K26) is located in the right relay panel.

Front 63

Where are the prime shutoff valves located?

Back 63

The prime shutoff valves are located on the top inboard center of the main fuel cells.

Front 64

What opens the prime shut off valve?

Back 64

The Engine starter relay opens the prime shutoff valve. The Engine fuel system is primed when the prime shutoff valve is opened.

Front 65

Where is the prime boost pump located?

Back 65

The prime boost pump is locatd on top of the right main fuel cell.

Front 66

What happens when the fuel pump switch is placed in the fule prime position?

Back 66

When the switch is in the FUEL PRIME position the prime boost pump is energized and the prime shutoff valve to each main engine fuel supply line is opened. This mode will illum the PRIME BOOST PUMP ON capsule on the caution/advisory panel.

Front 67

Engine start malfunctoin experinced with the APU as the air source.
Starter will not stay engaged. (Starter light going out when starter button released)

Back 67

If this malfuntion occurs, the auto-start system is malfunctioning and the pilot should conduct a manual start.

Front 68

Engine start malfunctoin experinced with the APU as the air source.
No Rise in TGT, Oil pressure, or %RPM 1 or 2.

Back 68

Conduct an Emergency Engine shutdown. No %rpm 1 or 2 could be because of gust lock engaged. No rise in TGT before 45 seconds could be caused by ignition key in Off position. ( in this case do not turn the key to the on position, this will ignite all of the fuel in the combustion chamber.

Front 69

Engine start malfunctoin experinced with the APU as the air source.
TGT rise above 850

Back 69

If TGT rises above 850 during engine start sequence, an emergency engine shutdown must be completed, and starter motored until tgt is below 538.

Front 70

Engine start malfunctoin experinced with the APU as the air source.
Starter Dropout prior to 52% NG

Back 70

the NG section needs starter assist until 52% NG speed. If the starter drops out too soon a hot start may result, complete an emergency engine shutdown.

Front 71

Engine start malfunctoin experinced with the APU as the air source.
Starter does not disengage past 65% NG

Back 71

Pull downward on the malfuntioning PCL actuating the abourt switch. If this does not cause starter drop out, the start valve is stuck in the open position, and hot air will eventually damage the starter. The pilot must remove air source as required.