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Metro Traineeship > HCMT faults > Flashcards

HCMT faults Flashcards

1
Q

What four items are attached to the HCMT pneumatic system?

A
  • Brakes
  • Air Suspension
  • Main Res
  • Pantographs
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2
Q

What are the two places we can isolate a pantograph from? Which one is typically used when performing an isoaltion?

A

On the underframe, or inside the U12 saloon cupboard.

We typically use the U12 saloon cock

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3
Q

What are the four potential indications of brake faults on an HCMT?

A
  • Passenger report
  • Unexpected retardation
  • Smell
  • Smoke
  • You got it :)
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4
Q

What is the maximum number of bogies that can be isolated on an HCMT before it is taken out of service?

A

3

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5
Q

What should a driver do if they receive a Brake Disc Over Temperature warning?

A

Slow the speed of the train and submit a TMM

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6
Q

How can a driver attempt to rectify sticking brakes on an HCMT? (4)

A
  • Navigate to Main Status Screen Page 2 (observe brake cylinder pressure)
  • Move MC to coast
  • Observe brake cylinder pressure decrease below 20 kPa
  • Fan the brake a few times (from max brake to coast)
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7
Q

What should a driver do if they can’t rectify sticking brakes?

How would they go about this? (3)

A

EP/Friction brake should be isolated.

Brakes can be isolated from either:
- Saloon brake isolating cock in cupboard B06 (one per car)
- Brake Control Module isolating cock (one per bogie)
- Brake Control Module supply isolating cock (one per car)

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8
Q

What other piece of equipment must also be isolated when isolating EP friction brakes?

A

Park brakes must also be isolated and manually released

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9
Q

Can EP friction brakes be isolated without Metrol’s permission?

A

Lol no

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10
Q

What will happen if both bogies are isolated on a Tc car?

A

Train is disabled

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11
Q

Can a driver isolate a single bogie’s air suspension on a car?

A

No, if a driver is required to isolate air suspension on a car they must isolate suspension on both bogies.

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12
Q

What is the speed restriction a driver must adhere to with isolated/defective air suspension?

A

Maximum 40km/h

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13
Q

How does the Speed Limit Control function work in regards to speed restrictions regarding isolated air suspension?

A

If a driver goes 3km/h over the maximum allowed speed of 40km/h, the Speed Limit Control will automatically apply full-service brakes

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14
Q

Where are the air suspension isolating cocks located?

A

On the B side towards no. 2 end

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15
Q

Where are the Main Res through cocks located?

A

B side on both ends

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16
Q

When isolating MR through the use of the MR through cocks, must the cocks on the adjacent cars also be turned?

A

Yep

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17
Q

How can a driver identify from the cab where a Main Res leak is taking place?

A

Main Status Screen Page 2/2 – driver can view MR pressure on Leading and Trailing cars. A discrepancy in values indicates a MR leak.

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18
Q

When walking the length of the train, how would a driver identify where a MR leak has taken place?

A

Listening. (Also, track access and full cab unattended etc etc etc)

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19
Q

If MR pressure is lost on a Tc car, what brakes are available to that car?

A

None. Train disabled.

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20
Q

What equipment is lost if there has been a MR failure on a Tc car? (8)

A

HATH FEDS
As in “I hath feds the cat”

  • Holding brake
  • Air suspension
  • Trip
  • Horn
  • Friction brake
  • Emergency brake
  • Driver/OJT seat
  • Sanders
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21
Q

What equipment should be isolated in case of MR failure on a Tc car? (3)

A
  • MR
  • Trip
  • Compressor
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22
Q

What equipment is lost in MR failure on a DMp car? (4/5)

What equipment would need to be isolated in this instance?

A

FAP(P)S
- Friction brake
- Air suspension
- Park brake
(- Panto maybe, depending on aux compressor)
- Sanders

Isolate: Main Res and Park Brakes

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23
Q

What equipment is lost in MR failure to Mp car? (7)

What would need to be isolated?

A

PAST FAP
As in “Had a good past fap”

  • Park Brakes
  • Air suspension
  • Sanders
  • Traction motors
  • Friction Brake
  • APS in trailer car (variable)
  • Panto

Isolate: Main Res and Park Brakes

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24
Q

What equipment is lost in MR failure on DT car? (4)

What needs to be isolated?

A

FAPS

  • Friction Brake
  • Air suspension
  • Park brakes
  • Sanders

Isolate: MR and park brakes

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25
Q

What is the “brain of the train”?

A

Train Management System (TMS)/Electronic Train Information Systems (eTIS)

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26
Q

What are the three levels of alert on an HCMT, in order of importance?

A
  • Level 1 (High importance – immediate attention)
  • Level 2 (Medium – when safe to do so)
  • Level 3 (Low – eeeh whatever)
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27
Q

The bypassing of which safety systems would cause the Safety System Bypass fault light illuminate? (4)

A
  • Traction Interlock
  • Zero Speed
  • Trip
  • Driver Safety Device
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28
Q

What are the three methods to rectify an electrical fault on an HCMT?

A
  • Reset (press applicable reset button)
  • Trip and Reset Circuit Breaker
  • Stable
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29
Q

How many times may a driver generally attempt to reset a defect on an HCMT?

A

2

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30
Q

After gaining permission to do so, how would a driver perform a “Hard” stable? (2)

A
  • Press PANTO LOWER
  • Hold the STABLE/START UP switch to STABLE for seven seconds
31
Q

What happens to marker lights when stabling a HCMT for fault rectification purposes?

A

They extinguish

32
Q

According to current procedure, can you stable a HCMT on the mainline for fault rectification purposes?

A

No

33
Q

When operating in degraded mode with a safety system isolated, how often must a driver press the Safety System Bypass Acknowledge button?

A

Every 30 seconds

34
Q

When would a driver operate the Main Reservoir Pressure Switch, and why?

A

When coupled to a Comeng train for rescue purposes.

Why? Safety loop will open on HCMT if MR pressure drops below 600 kPa, and Comeng operating pressure is 585 to 725 kPa. Avoids potential de-activation of safety loop.

35
Q

What bypass system on a HCMT is pretty much the same as a Door Loop Bypass on other trains?

What are the three scenarios in the courseware that would require it?

A

Traction Interlock

Use when presented with unresolving
- FDCL
- No door close light
- Door faults

36
Q

What bypass system on a HCMT is pretty much the same as the TACHO?

What are the three scenarios in the courseware that would require it?

A

Zero Speed

Use when:
- Saloon doors do not open and may not illuminate as available
- Safety Loop does not energise and may not reset when reverser is in neutral
- Stopping aid does not function correctly/at all

37
Q

What is the function of the Driver Safety Device bypass switch?

A

Removes Vigilance, Hand and Foot Pilot Valves from the Safety Loop Circuit

38
Q

What is the function of the Trip bypass switch?

A

It’s obvious

39
Q

Aside from its funny name, what is the purpose of the Get Home Mode?

A

Allows driver to apply traction and brakes in event of a Pulse Width Module failure?

40
Q

And what is a Pulse Width Module?

A

Lol no idea

41
Q

What are the three main types of electrical fault on an HCMT?

A
  • Circuit breaker
  • Traction
  • Aux power
42
Q

Will most electrical systems self-isolate if a fault is detected?

A

Yes

43
Q

What are the single point failure circuit breakers on an HCMT? (If any trip and cannot be reset, train is disabled)

A
  • Brake Control Supply
  • Emergency Brake Loop Power Supply
  • Traction Control
  • Cab Activation

(BET-C)

44
Q

If both Traction and Aux Power Systems fail simultaneously, what is the likely cause?

A

HSCB tripped (either from train fault or overhead issues)

45
Q

How can a driver rectify a Traction and/or Aux Power fault?

A

Push the TCU/ACU Reset button

(It’s on the A side electrical cabinet and we need permission)

46
Q

Door Pictograms:
What does solid grey inside indicate?

A

Door closed and unavailable for release

47
Q

Door Pictograms:
What does solid green inside indicate?

A

Door closed but available for release

48
Q

Door Pictograms:
What does solid white outside indicate?

A

Door is currently open

49
Q

Door Pictograms:
What does solid red inside/outside/flashing indicate?

A

Inside: failed door in closed position
Outside: failed door in open position
Flashing: DER pulled to stage 2 or EAD button held down

50
Q

Door Pictograms:
What does solid yellow inside indicate?

A

Door isolated

51
Q

Door Pictograms:
What does solid black inside indicate?

A

Status unknown

52
Q

Is there an electrical connection on the HCMT coupler?

A

No

53
Q

How many people are required to lift the front coupler cover?

A

Minimum of 2

54
Q

When is the Transition coupler used on an HCMT?

A

When coupling with a locomotive

55
Q

What is the function of the Towing Unit?

A

To read and write BP pressure on train rescue scenarios

56
Q

Is the HCMT fitted with a continuous brake pipe?

A

No

57
Q

During a rescue scenario, at what brake pipe pressure will an emergency brake application be initiated?

A

300 kPa

58
Q

What are the positions of the Recovery Switch?

A
  1. Pushed by other train
  2. Pulling other train
  3. Pulled by other train
  4. Pushing other trains
59
Q

When rescuing, will the Rescue Mode Status automatically detect what type of train it is being coupled to?

A

No

60
Q

Where is the transition coupler located?

A

Underframe of Tc cars

61
Q

Where are the couple/uncouple buttons located?

A

OJT panel

62
Q

In regards to door faults, when will the DCU (Door Control Unit) activate the door obstacle sequence?

A

If the door motor speed is below its normal speed limit

63
Q

What happens on the fourth activation of the door obstacle sequence? (4)

A
  • Door will reopen fully
  • TMS will show door as failed
  • Level 2 alert will be generated
  • Door will remain open until another Door Close command is issued
64
Q

Can an HCMT get traction tower if a bulkhead door is open?

A

Yes

65
Q

Once a DER has been activated, how long does a driver have to acknowledge/cancel until doors are released?

A

20 seconds

66
Q

How long does the DER INHIBIT button inhibit future DER activations?

A

120 seconds

67
Q

If the train is in motion and the DER handle remains in the Stage 1 limited position, when does the 20 second timer begin to countdown?

A

Once the train has come to a stand

68
Q

What indication does a driver get when an EXTERNAL saloon DER is pulled? (3)

Will traction be available?

A
  • Extinguished Door Close light
  • TMS Alert: Door X by EAD – Car XXXX
  • TMS pictogram flashes red on affected for

Traction will be unavailable

69
Q

If the External Cab EAD is being pressed, what indication will a driver get? (2)

How long does a driver have to inhibit it, and how long does it block further access?

A
  • TMS Alert: CAB EAD ACTIVATED
  • Train pictogram of affected door will be flashing red

Driver has 10 seconds to inhibit, can’t be reactivated for 5 minutes

70
Q

Define a “Substandard Beacon Read”

A

When one of the two beacon readers on the HCMT fails to read the track-mounted Balise on approach to a platform.

71
Q

What are the steps of the ASDC procedure?

A
  • Announcement
  • Survey the back of the train is on the platform
  • Door – point to it
  • Cover – open it and press the button
72
Q

Describe the Door Selection process for the ASDC

A

Select first and last doors to be released, and press “accept selection”

73
Q

How would a driver isolate a defective open door on an HCMT? (5)

A

(full cab unattended etc)
- Attempt to manually close door
- If manual attempt unsuccessful, pull DER to level 2 and manually close again
- Isolate door using tri-key
- Check by pressing Oor Open button
- Apply sticker

Metro Traineeship (31 decks)

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