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whiskey (Why Am I Saying What What Way?) > Transmission System > Flashcards

Transmission System Flashcards

Spinny Spin

1
Q

SETUP: NR decreases from 100-96% with an increase in Q in steady flight

What is wrong?

-1 Section III

A

Main transmission planetary carrier may have failed.

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2
Q

EP

During a main transmission failure or main xmsn press or main xmsn oil hot caution, what will the loss of cooling oil supply result in?

-1 Section III

A

Electrical and/or mechanical failure of main generators.

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3
Q

EP

What are some considerations with main transmission failure?

-1 Section III

A

Avoid rapid or frequent power changes, APU should be started so that the APU generator will be immediatly available (if main generators fail), a running landing is preferable.

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4
Q

EP

If impending transmission failure is suspected, what is the primary consideration?

-1 Section III

A

Land the helicopter before the failure progresses to gear box seizure or loss of drive to the main and/or tail rotor.

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5
Q

OpsLimits

What aircraft flight condition would cause momentary fluctuations in oil pressure?

-1 Section V

A

Flying with pitch attitudes above +6 degrees
Hovering in gusty wind conditions

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6
Q

OpsLimits

Under what conditions of the oil pressure should an entry be made in the forms?

-1 Section V

A

Oil pressure is not steady during steady state forward flight or in a hover
Oil pressure is steady but under 45 psi
Sudden pressure drops (greater than 10 psi) without fluctuation

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7
Q

OpsLimits

What action is prohibited in regards to the gust lock?

-1 Section V

A

Operating the engine against the gust lock

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8
Q

OpsLimits

What is the maximum NR speed for rotor brake application?

-1 Section V

A

76% NR (emergencies only)

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9
Q

OpsLimits

What is the maximum NR speed for routine stops with the rotor brake?

-1 Section V

A

40% NR

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10
Q

OpsLimits

What is the psi range during routine stops with the rotor brake?

-1 Section V

A

150-180

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11
Q

OpsLimits

What is the duration allowed for the rotor brake to be applied during routine stops?

-1 Section V

A

12-18 seconds

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12
Q

OpsLimits

What is the psi range for rotor brake starts?

-1 Section V

A

450-690

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13
Q

OpsLimits

What speed can we operate the engines up to with the rotor brake on? (During rotor brake starts)

-1 Section V

A

Up to IDLE only

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14
Q

OpsLimits

Can a dual engine start be done with the rotor brake? Is there a time associated with it?

-1 Section V

A

Yes, single and dual engine starts are allowed.
No, there is no time limit for rotor brake operations with single or dual engine starts, or with operations at IDLE

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15
Q

OpsLimits

What is the maximum wind velocity for rotor start or stop?

-1 Section V

A

45 knots from any direction

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16
Q

OpsLimits

What is the max NR speed?

-1 Section V

A

120%

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17
Q

What is the purpose of the input module?

-1 Section 1

A

Transmit power from the engines to the main transmission.
It also contains the freewheeling unit.

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18
Q

What is the function of the freewheeling unit? (i.e. why do we care)

-1 Section 1

A

Allows engine disengagement during autorotation.
If an engine isn’t operating it allows the accessory module to continue to be driven by the main rotor. (Still have hydraulic and gens)

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19
Q

What are the five modules of the main transmission?

-1 Section 1

A

Two input modules, main module, two accessory modules.

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20
Q

What is the purpose of the accessory module?

-1 Section 1

A

Provides mounting and drive for an electrical generator and a hydraulic pump.

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21
Q

Where is the rotor speed sensor that provides signals for the EICAS and PFD power pods?

-1 Section 1

A

Right accessory module

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22
Q

Where is the rotor speed sensor that provides input signals to the EDECU for improved transient droop response?

-1 Section 1

A

Left accessory module.

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23
Q

What is also incorporated into the transmission oil cooling system?

-1 Section 1

A

The AC generators on the accessory modules also receive oil for cooling.

24
Q

What protects the oil system?

-1 Section 1

A

Pressure regulating and bypass valves, they return excess high-pressure oil back to the inlet side of the pump.
A two-stage oil filter and various strainers help prevent contamination.

25
Q

Why doesn’t the oil filter impending bypass indicator pop when the oil is cold and thick?

-1 Section 1

A

Thermal lockout.

26
Q

How is the oil cooled?

-1 Section 1

A

The oil cooler uses a blower driven by the tail rotor drive shaft to cool oil before it enters the various modles.

27
Q

Where is the oil pressure switch (light) located? Why is that the location?

-1 Section 1

A

Left accessory module.
It’s the farthest point from the pumps.

28
Q

Where is the oil temperature switch located?

-1 Section 1

A

Oil cooler input to the main module near the tail takeoff drive shaft flange.

29
Q

Where is the oil temperature guage sensor?

-1 Section 1

A

Between the sump and pump.

30
Q

Where is the oil pressure guage sensor?

-1 Section 1

A

Main module manifold

31
Q

The transmission has two sensors that send data independently of the tapes, what are they for and where do they go? (WHERE DID YOU COME FROM COTTON EYED JO)

-1 Section 1

A

Oil temperature sensor and oil pressure sensors
They send signals through each DCU independently of the tapes.

32
Q

How many chip detectors are on the main transmission?

-1 Section 1

A

5
Left and right input
left and right accessory
Main module

33
Q

If you had to change a chip sensor, which one would you NOT want to change and why?

-1 Section 1

A

The main transmission module because it doesn’t have a self-sealing provision (self-sealing provision means it can be removed for visual inspection without loss of oil).

34
Q

What prevents false warnings in the chip detectors?

-1 Section 1

A

The fuzz burn off feature (burns off small chips and fuzz)

35
Q

What will deactivate the fuzz-burn off feature?

-1 Section 1

A

When oil temperature reaches 140 C (the temp that the caution illuminates).

36
Q

Even though fuzz burn is deactivated at 140 C, what will the detectors still do?

-1 Section 1

A

The fuzz burn off feature does not disable detection and illumination of cautions.

37
Q

Why is the main module chip detector unique?

-1 Section 1

A

It is connected toa 30 second time dealy relay to allow small chips and fuzz to burn off and or wash away.

38
Q

Why are the intermediate and tail gear box sensors unique?

-1 Section 1

A

They combine metal fuzz suppression chip and temperature sensor into one sensor.

39
Q

What do you NOT want to see while the chip detectors are going through their power-up IBIT?

-1 Section 1

A

Chip cautions. During the test none of them should illuminate.

40
Q

How will you know if a chip detector failed the IBIT?

-1 Section 1

A

A CHIP IBIT FAIL caution will illuminate.

41
Q

Besides transmitting torque to the tail rotor, what do the shafts drive?

-1 Section 1

A

They drive the oil cooler blower.

42
Q

How is the rotor driven and controlled? (simple)

-1 Section 1

A

Driven by the engines through the transmission, and controlled via the flight control system.

43
Q

Why do we care about the elastomeric bearings?

-1 Section 1

A

They allow the blade to flap, lead, and lag.

44
Q

What are the hydraulic dampners on the blades controlling? What other purpose do they serve?

-1 Section 1

A

They control lag motion.
They also restrain hunting (lead and lag) during rotation and absorb rotor head starting and stopping loads.

45
Q

What controls pitch in the blades?

-1 Section 1

A

Adjustable control rods.

46
Q

How do you know that a dampner is fully serviced?

-1 Section 1

A

The indicator will show gold.

47
Q

What is the purpose of the droop stop cams?

-1 Section 1

A

The blades and spindles rest on them when the rotor isn’t turning.

48
Q

What is the purpose of the bifilar?

-1 Section 1

A

Reduces rotor vibration at the rotor.

49
Q

What prevents damage to the spindles during rotor brake operation?

-1 Section 1

A

Each spindle has attached lead lag stops

50
Q

What is incorporated into the blades to assist in deicing?

-1 Section 1

A

Electro-thermal blankets are bonded into the blades leading edge.

51
Q

What failsafe is incorporated with the ROTOR BRAKE ON caution? (applying the rotor brake)

-1 Section 1

A

The ground idle quadrant lock is set.

52
Q

What function is added to the rotor brake to assist in setting the rotor brake for engine starts?

-1 Section 1

A

T shaped rotor brake handle lock pin. It prevents inadvertent release of the rotor brake once it has been applied.

53
Q

If one tail rotor cable is severed, what will cause the other tail rotor cable to disconnect?

-1 Section 1

A

If the helicopter is shut down and/or hydraulic power is removed. Force from the boost servo cannot react against control cable quadrant spring tension.

54
Q

What keeps the other tail rotor cable operating in a normal manner when one has been severed?

-1 Section 1

A

Spring tension.

55
Q

What’s a good way to remember where the oil temp tape transmitter is?

Phonetics

A

Tape, temp, transmitter. Battlestar Galactica.
Because it’s the center of the universe (galaxy) so it’s the main sump (between sump and pump)

56
Q

What’s a good way to remember where the lights (switchs) are for the transmission?

Phonetics

A

Light UP and down right.
Up because the Oil Pressure Switch is UP (left accessory)
and DOWN RIGHT because oil temp switch is to the RIGHT and aft of the transmission (oil cooler input to main module)

whiskey (Why Am I Saying What What Way?) (17 decks)

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