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Drive System Flashcards

1
Q

Primary function of the drive system

A

To transmit torque from the engines to the proprotors

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2
Q

Secondary functions of the drive system

A
  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.
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3
Q

PRGB

A

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

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4
Q

PRGB Overrunning Clutch

A

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

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5
Q

Total reduction of PRGB

A

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

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6
Q

Pressure regulating bypass valve in PRGB Lubrication System

A

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

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7
Q

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

A

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

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8
Q

What provides cooling for the PRGB lubrication system

A

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

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9
Q

Nacelle heat exchanger thermostatic bypass valve

A

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

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10
Q

ELS

A

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.

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11
Q

When is the ELS activated? When is it deactivated?

A

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

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12
Q

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

A

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.

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13
Q

Functions of the TAGB

A
  1. Change the angle of drive2. Transmit power from the same side PRGB to the MWGB3. Reduce input shaft speed to the ICDS
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14
Q

TAGB gear reduction

A

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

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15
Q

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

A

increased oil temperature

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16
Q

5 components mounted on and driven by the TAGB accessory section

A
  1. Generator 2. Gearbox oil pump3. Dual-stage oil filter assembly4. Hydraulic Pump5. Nacelle Blower Driveshaft
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17
Q

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

A

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

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18
Q

What provides cooling for the TAGB lubrication system

A

Nacelle heat exchangers

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19
Q

MWGB

A

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

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20
Q

What components are mounted on and interact with the MWGB

A

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

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21
Q

Which way do the proprotors turn?

A

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

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22
Q

what causes the proprotors to turn in opposite directions

A

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

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23
Q

Major Components of the drive system

A
  1. Proprotor gearbox (PRGB)2. Pylon support assembly 3. Tilt axis gearbox (TAGB) 4. Interconnect Drive System (ICDS)5. Midwing gearbox (MWGB)
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24
Q

Input Quill Assembly

A

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.

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25
Q

Pylon Driveshaft Quill

A

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

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26
Q

Overrunning Clutch

A

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

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27
Q

Nacelle Heat Exchanger

A

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

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28
Q

DSIU

A

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

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29
Q

Functions of the DSIU

A
  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.
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30
Q

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

A

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

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31
Q

How many debris sensors are in the TAGB

A

2

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32
Q

What activates the ELS

A

The DSIU

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33
Q

When should ELS endurance timing be commenced

A

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

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34
Q

Pylon Support Assembly

A

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

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35
Q

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

A

increased oil temperature

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36
Q

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

A

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

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37
Q

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

A

50 psi versus 30 psi during normal operations

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38
Q

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

A

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

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39
Q

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

A

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

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40
Q

ICDS

A

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.

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41
Q

ICDS Components

A
  1. Pylon driveshaft2. Nacelle blower driveshaft3. Interconnecting driveshafts4. Coupling support assemblies
42
Q

ICDS Pylon driveshaft

A

Transfers torque between the PRGB and TAGB

43
Q

ICDS Nacelle blower driveshaft

A

Transfers power from the TAGB to the nacelle heat exchanger blower

44
Q

ICDS Interconnecting driveshafts

A

5 interconnecting driveshafts that connect the TAGB to the MWGB.

45
Q

ICDS Coupling support assemblies

A

(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
Q

What drives the MWGB

A

Either the APU or the ICDS

47
Q

When does the ICDS drive the MWGB

A

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

48
Q

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

A

The No. 4 VFG

49
Q

What accessories are mounted on and driven by the MWGB

A
  1. No. 1 CFG2. No. 3 Hydraulic Pump3. No. 4 VFG4. Shaft driven compressor
50
Q

Rotor brake

A

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
Q

RPU

A

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

52
Q

When does the MWGB bypass valve kick in

A

if differential pressure reaches 142 psi

53
Q

How many debris sensors does the MWGB have

A

one

54
Q

Oil Cooler and Fan Assembly

A

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
Q

Delay takeoff until gearbox oil temperatures reach____

A

20 degrees C

56
Q

PRGB Warning

A

Indicates PRGB failure and ELS has failed to activate

57
Q

What triggers PRGB or TAGB warnings

A

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
Q

Single engine with an ICDS failure is unrecoverable below ___

A

170 to 175 KCAS

59
Q

What triggers ICDS warnings

A

When proprotor azimuth sensors detect that the proprotors are not synchronized

60
Q

How should the crew respond to sustained RPM LOW condition indicated

A

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

61
Q

RPM Warning

A

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

62
Q

What triggers L/R PRGB HOT Caution

A

PRGB temperature is greater than or equal to 110 degrees C

63
Q

What triggers L/R PRGB PRESS CRIT HI Caution

A

PRGB oil pressure is greater than 150 psi

64
Q

L/R PRGB PRESS LOST Caution

A

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

65
Q

What triggers the L/R PRGB PRESS LOST Caution

A

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

66
Q

What triggers the L/R PRGB PRESS LOW Caution

A

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

67
Q

What triggers the L/R PRGB PRESS HIGH Advisory

A

PRGB Oil pressure between 95 to 150 psi

68
Q

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

A

ELS; catastrophic failure in as little as 2 minutes

69
Q

Failure of the DSIU will affect the availability of ____

A

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

70
Q

Loss of ELS function with subsequent PRGB PRESS LOST dictates ____

A

an immediate landing

71
Q

EMERG LUBE HEAT FAIL Advisory

A

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

72
Q

What triggers the L/R TAGB HOT Caution

A

TAGB oil temperature greater than or equal to 110 degrees C

73
Q

What triggers the L/R TAGB PRESS CRIT HI Caution

A

TAGB oil pressure is greater than 150 psi

74
Q

What else will you lose with a Right TAGB PRESS LOST

A

CFG No. 2

75
Q

What triggers a L/R TAGB PRESS LOST Caution

A

TAGB oil pressure less than 30 psi with both engines operating

76
Q

What triggers a L/R TAGB PRESS LOW OEI Caution

A

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

77
Q

What triggers L/R TAGB PRESS HIGH Advisory

A

TAGB oil pressure is between 95 and 150 psi

78
Q

What triggers L/R TAGB PRESS LOW Advisory

A

TAGB low oil pressure between 30 and 60 psi

79
Q

What triggers MWGB HOT Caution

A

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
Q

What triggers MWGB PRESS CRIT HI Caution

A

MWGB oil pressure above 100 psi

81
Q

MWGB is designed to run without oil at minimum loads for

A

30 minutes

82
Q

What triggers MWGB PRESS LOST Caution

A

MWGB oil pressure is less than 25 psi

83
Q

What triggers MWGB PRESS HIGH Advisory

A

MWGB oil pressure between 65 and 100 psi

84
Q

What triggers MWGB PRESS LOW Advisory

A

MWGB oil pressure between 25 and 40 psi

85
Q

Purpose of the ICDS

A

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

86
Q

Nacelle Blower Driveshaft

A

transfers power from the TAGB to the nacelle heat exchanger blower

87
Q

Pylon Driveshaft

A

Transfers torque between the PRGB and TAGB

88
Q

How many Interconnecting driveshafts are there

A

5

89
Q

Purpose of the MWGB

A

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

90
Q

The MWGB is driven by

A

Either the APU or ICDS

91
Q

When can the rotor brake be operated

A

Only when the ECLs are in the OFF position

92
Q

What happens to the ECLs when the rotor brake is ON

A

ECLs are mechanically blocked from movement past the CRANK position

93
Q

PRGB/TAGB Oil Pressure Limitations

A

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
Q

MWGB Oil Pressure Limitation

A

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

95
Q

PRGB/TAGB Oil Temperature Limitation

A

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
Q

MWGB Oil Temperature Limitation

A

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
Q

When will ICDS Failure Warning Post when ICDS is intact

A

triple Nr sensor failure on one side

98
Q

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

A

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

99
Q

What do you lose with an inoperative DSIU

A

All chip detectors and the ELS

100
Q

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

A

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

101
Q

What else will be lost with MWGB PRESS LOST Caution

A

CFG No. 1

NR (20 decks)

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