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CH47 systems photos > CH47 Powertrain > Flashcards

CH47 Powertrain Flashcards

1
Q

How many transmissions? Name each.

A
  1. Forward, Aft. Combining, No1 and No2 engine
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2
Q

How are the transmissions connected?

A

By two engine driven drive shafts and nine synchronizing shafts.

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3
Q

What are the seven transmission pressure low cautions?

A

ENG1, ENG2, FWD, COMB, AFT. AUX pressure for FWD, COMB, AFT XSMNS. And AFT SHAFT.

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4
Q

XSMN Caution will illuminate at? PSI

A

Below 20 PSI

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5
Q

COMB AUX OIL Pressure low caution illuminates at?

A

Below 10 PSI

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6
Q

What are the oil hot cautions? What Temp?

A

ENG1/2, FWD, COMB, AFT.
Greater than 140.

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7
Q

What are the transmission chip cautions?

A

FWD, COMB, AFT, No1, No2, AFT vertical shaft.

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8
Q

When does the chip caution illuminate?

A

When ferrous material has bridged the gap on the chip detector.

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9
Q

What are the debris screen cautions?

A

FWD, COMB (LH and RH), AFT, No1, No2 engine transmissions.

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10
Q

When will the transmission pressure high caution illuminate?

A

Above 90 PSI

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11
Q

At what temp will the ENG XMSN warning illuminate?

A

190

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12
Q

What does the maintenance panel show?

A

For each transmission it shows chips, debris, main pressure low, aux pressure low, temp high faults.

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13
Q

What is 1? What is 2?

A

Draft shaft assembly.
1. Synchronizing shaft
2. Flex couplings. Stainless steel.

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14
Q

Name each and what they do.

A
  1. Elastomer shock mount. Reduces vibrations.
  2. Zerk fitting. Grease fitting. Layered for strength and flexibility.
  3. Bearing housing
    4.Flex couplings.
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15
Q

What is this and what does it do?

A

Buzz burn off module. Can burn off particles .002 inch in size. Burns faster than caution illuminates. If can’t burn off particle, CHIP will illuminate.

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16
Q

When do you check the COMB XSMN oil level?

A

Within 30 minutes of shutdown. If shutdown for more than 30 operate rotors for min 5 minutes to verify oil level.

17
Q

ENG XSMN OIL TEMPS (NORMAL AND HOT CAUTION)

A

Green is 140 and below. Oil hot caution is above 140.

18
Q

ID 1 and 2

A

COMB XSMN OIL PUMPS. Left pump provides main lubrication to COMB XSMN & No 1 engine and right pump provides aux lube for COMB transmissions and No 2 eng XSMN. The engine transmissions do not have aux lubrication systems.

19
Q

What does this area house and what does the filter button indicate?

A

Engine transmission filter housing. Button shows the filter bypass visual indicator.

20
Q

Identify 1/2, 3 and 4

A

1/2: No 1 and No 2 engine transmission oil cooler. 3: Cooling fan. 4: Oil cooler temp/pressure bypass valve.

21
Q

How is oil cooled in the engine transmission oil cooler?

A

A fan which pulls air through the coolers. The fan is powered by a vertical shaft driven by an aux gear in the comb transmission.

22
Q

Identify 1, 2, 3, 4

A

1/2: Engine transmission inlet screen housing
3/4: 20 PSI pressure switch

23
Q

What are these? What pressure is normal? What pressure is high?

A

Engine transmission pressure transducer. Normal is equal to or greater than 20. High is greater than 90 PSI.

24
Q

What does the COMB XSMN do?

A

Combines the power of the engines and transmits it at reduced shaft speed to FWD and AFT transmissions.

25
Q

When do you check the oil level of the FWD and AFT transmisssions?

A

After 30 minutes from shutdown

26
Q

What is this? What does it do?

A

COMB transmission inlet screen. It filters oil prior to going to the transmission gears and bearings.

27
Q

What is this and what does it do?

A

COMB transmission main oil pressure switch. If pressure drops below 20 PSI it illuminates the COMB XSMN PRESS LO

28
Q

What is this?

A

COMB transmission chip detector

29
Q

What is this?

A

Debris screen/ chip detector assembly. Contains electromesh sensor.

30
Q

What is this?

A

Main oil filter. The main lubrication system circulates cooling oil through the two AC generators on the aft transmission

31
Q

What is this?

A

Oil pressure transducer for for aft transmission.

CH47 systems photos (3 decks)

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