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Metro157 > Comeng Faults - Pnuematics > Flashcards

Comeng Faults - Pnuematics Flashcards

1
Q

If main res pipe fails or supplementary res ruptures on a T car, what is affected?

A

Doors
Airbags
Brakes

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2
Q

How many bogies constitute above 80% braking capacity?

A

2

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3
Q

How many bogies isolated constitute 50%/80%?

A

Up to 6 bogies

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4
Q

What happens if you have a substantial leak in the control res?

A

You will lose main res pressure

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5
Q

What happens when you trip the compressor synch circuit breaker?

A

The local compressor runs independently off the pressure settings for that compressor

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6
Q

What pressure settings is read for the compressor governor to close?

A

The highest of the low range pressure settings

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7
Q

What pressure settings is read for the compressor governor to open?

A

The highest of the high pressure settings

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8
Q

What pressure setting does the main res safety valve release excess air?

A

775kpa

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9
Q

How do we isolate a local compressor governor?

A

Trip the compressor gov circuit breaker in that cab

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10
Q

How to we locate a defective compressor governor?

A

When compressors continue to run, go into each cab and trip the compressor gov circuit breaker until they all stop operating

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11
Q

What stops working if the compressor governor circuit breaker is tripped?

A

The train lined spring park brake buttons

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12
Q

With a leading motor main res pipe rupture, what do we lose?

A 
Doors
Uncouple
Whistle/wiper
Control res
Spring park brake
Air suspension
Brake controller 
Pantograph
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13
Q

What can happen if the automatic drain valve is broken and not plugged?

A

You will lose air in the brake cylinders

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14
Q

What is the procedure for a ruptured main res tank?

A 
Locate rupture
Close main res Delivery cocks
Turn off compressor contractor 
Release spring park brakes
Isolate compressor gov circuit breaker
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15
Q

What is the speed restrictions for a defective air bag?

A

Half the track speed and to a maximum of 30km/h

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16
Q

If the speed is 50km/h with deflated air suspension, what is the new speed?

A

25km/h due to half the track speed but a maximum of 30km/h

17
Q

What pressure is needed in the control res?

A

490-510kpa

18
Q

What is the control res function?

A

Allow line breakers to close

Activate trip latching gear

19
Q

What do we isolate if the pipe from the main res to the control res is broken or leaking?

A

Control res in isolating cock
Cut out motors
Local rheo
Submit tmm

20
Q

If there is a leak between the control res and line breaker case past the control res out isolating cock, what do we isolate?

A

Control res out and motors cut out switch to all out

21
Q

What is isolated if the trip latching lever is leaking from the control res?

A

The trip isolating cock in the van area

22
Q

What is the procedure if brake pipe and main res pressure are depleting?

A

Place brake handle to emergency
Ensure train is not derailed or broken away
While handle is in emergency, observe main res needle is stabilising
If not contact train control
If it is try to recharge brake pipe

23
Q

What pressure is needed in the line breaker case to close the circuit?

A

485kpa

24
Q

What happens if a MA is inoperative?

A

Half saloon lights, air con and headlights

On motor numbers 301-359 headlights may fail

25
Q

What is the procedure for a defective horn?

A

15km passing stations, yards, or track side workers and releasing the doors twice for customers who are within the yellow line

26
Q

With a defective horn what is the procedure through level crossings?

A

Flashing high beams and hazard lights

27
Q

What is the procedure for a continuously sounding horn?

A

Rapidly move the lever

28
Q

Define a horn defect

A

Not sounding
Continuously sounding
Tone too low

Metro157 (81 decks)

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