Transcript Engineering Change to Improve the Efficiency of OTMR

Engineering Change to Improve the
Efficiency of OTMR Maintenance
Image © HaslerRail
By Jamie Adamson, Engineering Graduate, First ScotRail
Introduction to OTMR usage on railway
vehicles
Technology
• OTMR = On Train Monitoring Recorder (also known as on train data
recorder, incident recorder)
• Railway equivalent of “black box”
• Monitoring of brake/throttle control circuits, brake pressures,
AWS/TPWS, door controls, driver safety systems, and many more.
Legislation
• GM/RT2472 (Data Recorders on Trains – Design Requirements)
– 1990s: Mandatory requirement of all new-build rolling stock
– 2000: Mandatory requirement of all existing rolling stock (with 5-year grace
period)
Scope of Task
•
•
•
•
Devise new time-saving method to verify that all OTMR system
‘channels’ are recording correctly
Trial new methods, assess suitability
Revise Vehicle Maintenance Instruction (VMI) tasks, complete risk
assessment
Submit for Vehicle Acceptance Body assurance and Leasing
companies for approval
Present Verification Method
• Activate every switch, lever and button that operates an OTMR
channel
• View in real-time with a laptop or take a download and analyse data
• Extensively test AWS/TPWS receiver
• Test speedometer and WSP
• …And do it all again for the other cab!
(Note: ScotRail multiple unit fleet has 584 cabs)
Methods Considered
Method 1: Data Download only
•
Take OTMR data download covering last 3
days of service and check that all channels
have been used.
•
PROs: works fine for digital channels, takes
a short time to verify channel usage
•
CONs: No way of ensuring analogue
channels work within tolerance
Methods Considered (cont)
Method 2: Microsoft Excel Macro
•
Take OTMR data download covering last 3 days of
service, export to spreadsheet and use a macro to
instantly search for channel usage. Full static test of
analogue channel systems.
•
PROs: Very effective, instant result. Properly verifies
analogue channels
•
CONs: Pre-requisite knowledge of MS Excel needed.
Macro at risk of corruption. Would need re-written if
channels were added/removed/renamed.
Methods Considered (cont)
Method 3: Download check and real-time rare/analogue channel use
•
Take OTMR data download covering last 3
days of service, static test of analogue
channel systems plus rarely-used isolation
channels.
•
PROs: Properly scrutinises analogue
channels, most likely to gain VAB approval
and reduce timescale.
•
CONs: Whole process is more extensive, VMI
task looks more complex on paper than it is.
Risk Assessment and Evaluation
•
Methodology follows EC directive, Notified National Technical Rules
(NNTR’s) and RGS (Railway Group standards)
ERA/TD/2011-01/XA
National Rule Annex
Section 9.6
(Recording Device)
Notified National
Technical Rules
(NNTRs)
Controlled by DfT
Common Safety
Method
EC Regulation
352/2009
GM/RT2472
•
GM/RT2472 has vague
guidance regarding OTMR
maintenance standards
•
Common Safety Method
was used for full risk
assessment of
engineering change
Risk Assessment and Evaluation – CSM Criteria
Criterion
Example
Assessment
Additionality
Series of small changes that collectively
evolve into a significant change
No minor changes to any First ScotRail OTMR systems that would
develop this engineering change into a significant change.
Failure Consequence
OTMR total failure in traffic; not detected
until next download opportunity
OTMR discovered as faulty, and will be repaired at depot. Unit can
continue in traffic provided the other driving cab’s OTMR is
functioning healthily, but schedule for repair ASAP as a
matter of course.
Novelty
Task format exists in similar form on class
334 VMI.
Task has not been amended significantly from new, so no
examples of task change to form a precedent.
Complexity
Maintenance procedure change only. No
physical change to on-train systems
Revision of task relies more on OTMR data analysis. Staff
awareness of expected channel behaviour should be checked.
Analogue channels cannot be precisely
checked using stored OTMR data.
Real-time checking of analogue channels will continue, to ensure
that calibration of these channels matches precisely with the
systems they are monitoring.
Monitoring
Process can be monitored to ensure new
procedure is being followed correctly.
Hard copy of channel check tick-sheets and back-up of OTMR
data is archived. ‘Product checks’ and competence refresher
can reduce likelihood of oversight.
Reversibility
Ability of the change to be ‘un-done’
If necessary, technical concession to revert to previous procedure
could be given until solution to change is provided.
Outcome
• VMIs undergoing independent assurance at present
• My understanding of OTMRs and onboard vehicle systems has
greatly improved
• Selling the benefits of the change to depots was a challenge
• Delving into EC and ERA (European Rail Agency) interoperability
legislation
Future Developments
• Remote Condition Monitoring
– Seeing real-time data accumulated by the OTMR from the comfort of
the office..
– Boolean logic helps identify potential defects and notify by email, while
the train is still in traffic
– Can verify most OTMR channels are working in an instant.
– Expand range of monitored systems to include door opening/closing
times, compressor running time
• Already working on East Coast class 91 fleet
• Trial on class 158s with First ScotRail
Thank you for listening.