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Flashcards in Drive System Deck (101):
1

Primary function of the drive system

To transmit torque from the engines to the proprotors

2

Secondary functions of the drive system

1. Provides synchronization of the proprotors and single engine operation of the proprotor system through the Interconnect Drive System (ICDS)2. Provides a drive for electrical, pneumatic, and hydraulic power generation.

3

PRGB

Proprotor Gearbox - Transmit power and provide a speed reduction from the engine to the proprotor mast

4

PRGB Overrunning Clutch

Transmits engine torque during normal operation and permits overrunning during single engine operation, autorotation, or if engine speeds are not matched

5

Total reduction of PRGB

Reduces 15,000 RPM engine input speed to 397 RPM (100% Nr) at the proprotor shaft

6

Pressure regulating bypass valve in PRGB Lubrication System

Protects the system by returning excess high pressure oil back to the inlet side of the pump

7

How many debris sensors are there on each PRGB and where are they located?

3; No. 1 sensor is on the air/oil separator, No. 2 sensor is on the front of each PRGB, No. 3 sensor is below the air/oil separator

8

What provides cooling for the PRGB lubrication system

Nacelle heat exchangers. Airflow through the heat exchangers is provided by the TAGB driven blowers

9

Nacelle heat exchanger thermostatic bypass valve

Directs a percentage of oil flow around the heat exchanger when oil temperature is below approx. 82 degrees C

10

ELS

Emergency Lubrication System - Provides automatic backup lubrication to either PRGB in the event of a primary lubrication system failure to allow the postponement of an otherwise immediate requirement for landing.

11

When is the ELS activated? When is it deactivated?

Any time primary lubrication pressure drops below 30 psi. it is deactivated if pressure fluctuates back up to 35 psi or more

12

ELS has capability to supply oil at a reduced rate for___. How should timing be managed in the event ELS is operated?

30 min. Timing should commense at first indication of PRGB PRESS LOST and should be maintained without interruption until landing and shutdown regardless of whether there is a temporary suspension of ELS.

13

Functions of the TAGB

1. Change the angle of drive2. Transmit power from the same side PRGB to the MWGB3. Reduce input shaft speed to the ICDS

14

TAGB gear reduction

Reduces 11,905 RPM input shaft speed to 6574 RPM output to the interconnecting drive shafts

15

During single engine operations the additional stress placed on operating side TAGB will result in ___

increased oil temperature

16

5 components mounted on and driven by the TAGB accessory section

1. Generator 2. Gearbox oil pump3. Dual-stage oil filter assembly4. Hydraulic Pump5. Nacelle Blower Driveshaft

17

How many debris sensors are in the TAGB and where are they located

2; No. 1 is on the sump and No. 2 is on the air/oil separator

18

What provides cooling for the TAGB lubrication system

Nacelle heat exchangers

19

MWGB

Midwing Gearbox - Multiple output unit that transmits power between the left and right interconnect driveshafts without changing speed or direction of rotation.

20

What components are mounted on and interact with the MWGB

APU, Rotor Positioning Unit (RPU), and rotor brake

21

Which way do the proprotors turn?

The right proprotor turns clockwise as seen from the aft of the aircraft and the left proprotor turns counterclockwise

22

what causes the proprotors to turn in opposite directions

An extra idler gear in the first stage gear train of the left PRGB causes the left proprotor to turn counterclockwise.

23

Major Components of the drive system

1. Proprotor gearbox (PRGB)2. Pylon support assembly 3. Tilt axis gearbox (TAGB) 4. Interconnect Drive System (ICDS)5. Midwing gearbox (MWGB)

24

Input Quill Assembly

Mounted on the lower aft portion of the PRGB. Provides the forward engine mount where the engine output shaft drives the first stage input gear train through an overrunning clutch.

25

Pylon Driveshaft Quill

The pylon driveshaft is connected to the pylon driveshaft quill and connects the PRGB to the TAGB.

26

Overrunning Clutch

Allows overrunning during single engine operation, autorotation, or if engine speeds are not matched. During single engine operations, it disengages the PRGB from the failed engine allowing the input quill to freewheel

27

Nacelle Heat Exchanger

Divided into 3 sections which provide oil/hydraulic fluid cooling for: The PRGB, TAGB/Generator, Hydraulic Pump

28

DSIU

Drive System Interface Unit - located in the midwing forward equipment shelf.

29

Functions of the DSIU

1. Monitors for oil debris in PRGBs, TAGBs, and MWGB and reports all debris to the MCs2. Monitors and controls the ELS and reports ELS status to MCs.

30

What automatically occurs when the DSIU detects debris on PRGB, TAGB, or MWGB sensors

The DSIU automatically initiates up to 3 attempts to electrically burn off the debris

31

How many debris sensors are in the TAGB

2

32

What activates the ELS

The DSIU

33

When should ELS endurance timing be commenced

At the first indication of PRGB PRESS LOST and should be maintained without interruption until landing and shutdown.

34

Pylon Support Assembly

Primary load bearing structure between the wings and nacelles and functions as a pivot point for converting the nacelles

35

During single engine operation the additional stress placed on the operating engine side TAGB will result in ____

increased oil temperature

36

Difference in high temperature warning limit on the TAGB during single engine operations

121 degrees C during single engine operations versus 132 degrees C during normal operations

37

Difference in low pressure warning limit on the TAGB during single engine operations

50 psi versus 30 psi during normal operations

38

With respect to generators the left TAGB drives ___ and the right TAGB drives ____

left drives VFG No. 3right drives CFG No. 2

39

With respect to hydraulic pumps the left TAGB drives ___ and the right TAGB drives

left drives No. 1 Hydraulic System pumpright drives No. 2 Hydraulic System pump

40

ICDS

Interconnect Drive System - Purpose is to synchronize the proprotors and transfer power between the proprotor systems and all accessory equipment which also enables single engine operation.

41

ICDS Components

1. Pylon driveshaft2. Nacelle blower driveshaft3. Interconnecting driveshafts4. Coupling support assemblies

42

ICDS Pylon driveshaft

Transfers torque between the PRGB and TAGB

43

ICDS Nacelle blower driveshaft

Transfers power from the TAGB to the nacelle heat exchanger blower

44

ICDS Interconnecting driveshafts

5 interconnecting driveshafts that connect the TAGB to the MWGB.

45

ICDS Coupling support assemblies

(4) located in each wing to provide attachment points that stabilize the 5 driveshafts of the ICDS. Each has vibration/temperature transducers that are monitored by the Vibration Structural Life and Engine Diagnostic (VSLED) system.

46

What drives the MWGB

Either the APU or the ICDS

47

When does the ICDS drive the MWGB

When Nr is 84% or greater the ICDS powers the MWGB and the APU is disengaged

48

What is not being driven when the APU is powering the MWGB

The No. 4 VFG

49

What accessories are mounted on and driven by the MWGB

1. No. 1 CFG2. No. 3 Hydraulic Pump3. No. 4 VFG4. Shaft driven compressor

50

Rotor brake

Electrically controlled, hydraulically operated unit mounted on the MWGB that is designed to stop the proprotors from 40% Nr in 12 seconds, and from 100% Nr in case of an emergency in 20 seconds

51

RPU

Rotor Positioning Unit - Used to position the rotor blades during the blade fold cycle.

52

When does the MWGB bypass valve kick in

if differential pressure reaches 142 psi

53

How many debris sensors does the MWGB have

one

54

Oil Cooler and Fan Assembly

located on the aft section of the MWGB that has 4 cores and provides cooled oil for: MWGB/No. 1 CFG, No. 3 Hydraulic pump, No. 4 VFG, and the Shaft Driven Compressor.

55

Delay takeoff until gearbox oil temperatures reach____

20 degrees C

56

PRGB Warning

Indicates PRGB failure and ELS has failed to activate

57

What triggers PRGB or TAGB warnings

Low oil pressure in the respective system and/or high oil temperature sufficient to indicate an impending catastrophic failure of the PRGB or TAGB

58

Single engine with an ICDS failure is unrecoverable below ___

170 to 175 KCAS

59

What triggers ICDS warnings

When proprotor azimuth sensors detect that the proprotors are not synchronized

60

How should the crew respond to sustained RPM LOW condition indicated

Slow control inputs and monitor Qm as there may be insufficient power to maintain Nr resulting in a severely degraded condition

61

RPM Warning

FCCs detect that Nr has dropped below 80.9% in APLN mode or below 94.7% in VTOL/CONV mode

62

What triggers L/R PRGB HOT Caution

PRGB temperature is greater than or equal to 110 degrees C

63

What triggers L/R PRGB PRESS CRIT HI Caution

PRGB oil pressure is greater than 150 psi

64

L/R PRGB PRESS LOST Caution

PRGB is indicating low oil pressure with both engines operating satisfactorily and the ELS on

65

What triggers the L/R PRGB PRESS LOST Caution

When primary PRGB lubrication is lost (less than 30 psi) but the ELS is providing supplemental lubrication.

66

What triggers the L/R PRGB PRESS LOW Caution

PRGB oil pressure between 30 to 60 psi normal operations, or 50 to 60 psi with single engine operations

67

What triggers the L/R PRGB PRESS HIGH Advisory

PRGB Oil pressure between 95 to 150 psi

68

___is not available with PRGB oil pressure invalid and subsequent loss of PRGB oil pressure could result in ___

ELS; catastrophic failure in as little as 2 minutes

69

Failure of the DSIU will affect the availability of ____

ELS and Debris sensors, therefore you will also get an EMERGENCY LUBE FAIL Caution and CHIP DETECTOR FAIL Advisory

70

Loss of ELS function with subsequent PRGB PRESS LOST dictates ____

an immediate landing

71

EMERG LUBE HEAT FAIL Advisory

Indicates that an ELS wing heater has failed and the system oil temperature is less than -7 degrees C

72

What triggers the L/R TAGB HOT Caution

TAGB oil temperature greater than or equal to 110 degrees C

73

What triggers the L/R TAGB PRESS CRIT HI Caution

TAGB oil pressure is greater than 150 psi

74

What else will you lose with a Right TAGB PRESS LOST

CFG No. 2

75

What triggers a L/R TAGB PRESS LOST Caution

TAGB oil pressure less than 30 psi with both engines operating

76

What triggers a L/R TAGB PRESS LOW OEI Caution

TAGB oil pressure between 50 and 60 psi with only one engine operative

77

What triggers L/R TAGB PRESS HIGH Advisory

TAGB oil pressure is between 95 and 150 psi

78

What triggers L/R TAGB PRESS LOW Advisory

TAGB low oil pressure between 30 and 60 psi

79

What triggers MWGB HOT Caution

MWGB oil temperature at or above 110 degrees C. There will not be a Warning if temperature increases to the warning range of 132 degrees C, but landing criteria changes from land as soon as practical to land as soon as possible

80

What triggers MWGB PRESS CRIT HI Caution

MWGB oil pressure above 100 psi

81

MWGB is designed to run without oil at minimum loads for

30 minutes

82

What triggers MWGB PRESS LOST Caution

MWGB oil pressure is less than 25 psi

83

What triggers MWGB PRESS HIGH Advisory

MWGB oil pressure between 65 and 100 psi

84

What triggers MWGB PRESS LOW Advisory

MWGB oil pressure between 25 and 40 psi

85

Purpose of the ICDS

To synchronize the proprotors and transfer power between the proprotor systems and all accessory equipment.

86

Nacelle Blower Driveshaft

transfers power from the TAGB to the nacelle heat exchanger blower

87

Pylon Driveshaft

Transfers torque between the PRGB and TAGB

88

How many Interconnecting driveshafts are there

5

89

Purpose of the MWGB

To transmit power between the left and right sides of the ICDS without changing speed or direction of rotation.

90

The MWGB is driven by

Either the APU or ICDS

91

When can the rotor brake be operated

Only when the ECLs are in the OFF position

92

What happens to the ECLs when the rotor brake is ON

ECLs are mechanically blocked from movement past the CRANK position

93

PRGB/TAGB Oil Pressure Limitations

Above 150 psi - High Warning95 to 150 psi - High Caution60 to 95 psi - Normal30 to 60 psi - Low Caution (Both Engines)50 to 60 psi - Low Caution (Single Engine)Below 30 psi - Low Warning (Both Engines)Below 50 psi - Low Warning (Single Engine)

94

MWGB Oil Pressure Limitation

Above 100 psi - High Warning65 to 100 psi - High Caution40 to 65 psi - Normal25 to 40 psi - Low CautionBelow 25 psi - Low Warning

95

PRGB/TAGB Oil Temperature Limitation

Above 132 degrees C - High Warning (Both Engines)Above 121 degrees C - High Warning (Single Engine)110 to 132 degrees C - High Caution (Both Engines)110 to 121 degrees C - High Caution (Single Engine)20 to 110 degrees C - NormalBelow 20 degrees C - Low Caution

96

MWGB Oil Temperature Limitation

Above 132 degrees C - High Warning 110 to 132 degrees C - High Caution 20 to 110 degrees C - NormalBelow 20 degrees C - Low Caution

97

When will ICDS Failure Warning Post when ICDS is intact

triple Nr sensor failure on one side

98

30 minutes of PRGB operation with only ELS lubrication is predicated on __

Minimum Qe on the effected engine. Up to 29% in APLN and 62% in VTOL/CONV

99

What do you lose with an inoperative DSIU

All chip detectors and the ELS

100

What is the result of a NAC BLOWER FAIL Caution and what pilot action should be taken

fluid temperatures in the affected nacelle will rise rapidly while in VTOL/CONV. Transitioning to APLN will provide sufficient cooling airflow.

101

What else will be lost with MWGB PRESS LOST Caution

CFG No. 1