Exams and Overhaul Documents

Status
Not open for further replies.

JModulo

Member
Joined
17 Nov 2013
Messages
466
Location
67A
Afternoon all,

Was wondering if anyone on here may be able to help. I'm currently a technician on bus and coaches, having wanted to transfer to rail for a while however my colour deficiency prevents this. On the buses there are servicing documents not too disimiliar to rail I would imagine for planned maintenance. Is anyone on here able to provide an example document of this either DMU, Coaches etc just to see how things compare for either regular exams, or overhaul such as a C6?
 
Sponsor Post - registered members do not see these adverts; click here to register, or click here to log in
R

RailUK Forums

millemille

Member
Joined
28 Jul 2011
Messages
279
Afternoon all,

Was wondering if anyone on here may be able to help. I'm currently a technician on bus and coaches, having wanted to transfer to rail for a while however my colour deficiency prevents this. On the buses there are servicing documents not too disimiliar to rail I would imagine for planned maintenance. Is anyone on here able to provide an example document of this either DMU, Coaches etc just to see how things compare for either regular exams, or overhaul such as a C6?
For the running maintenance, often known as level 1 to 4 maintenance, you've got a Vehicle Maintenance Schedule (VMS), often known as a "Star chart", which details which Vehicle Maintenance Instructions (VMI's) is to be carried out at what mileage or time period.

VMI's are instructions on how to carry out a task, whether a check and containing pass/fail or put back criteria (such as brake pad scrapping thickness) or a mandatory replacement irrespective of condition (compressor air filter replacement for example). The format of these will vary from fleet to fleet, maintainer to maintainer, vehicle builder to vehicle builder and can vary between a single line instruction, relying on the operative's competency to carry out the task properly, to a full Haynes manual style instruction with photo's and detailed instruction detailing every single tool used and how to use them, where the operative simply has to follow the instructions to the letter and the task will be completed properly.

VMI's often refer the operative to a Vehicle Maintenance Procedure (VMP) to carry out a repair, again the format of these is as varied as the VMI's.

When you get to overhaul, level 5 maintenance, it gets a bit more complex. You have a series of Vehicle Overhaul Instruction's (VOI's) which basically instruct how to remove the component that is to be overhauled or replaced. Once the component has been removed it is then overhauled in accordance with a Component Overhaul Instruction (COI), but it is also possible that the component, or sub-component, has to go back to a supplier and be overhauled in accordance with a Supplier Component Overhaul Instruction (SCOI).

Take a power bogie overhaul for example; the maintenance organisation that carries out the running maintenance may carry out the power bogie removal VOI. The power bogie then goes to an overhaul provider and the strip the bogie down in accordance with the COI. The bogie overhauler will overhaul the bogie frame (stripping it down, dipping/blasting to remove the old paint, NDT, painting, reassembling) in accordance with the same COI but send the traction motors to a specialist motor overhauler who will overhaul the motors in accordance with a SCOI.

And then there's still BR era legacy Workshop Instructions.

What I'm getting at, in a round about way, is there's no consistency in document format, work methods, level of detail, reliance on competency etc. So you getting a limited sample is not going to be representative of what is out there across the industry.
 
Status
Not open for further replies.

Top