Chp 4 ( Wear Debris Monitoring) Flashcards
What is the purpose of Wear Debris Monitoring (WDM)?
The purpose of WDM is to detect the symptoms of abnormal or premature wear, thus preventing failure and allowing equipment to remain in use for as long as is safely possible.
What does EFD stand for in the context of WDM?
EFD stands for Early Failure Detection.
What does SOAP stand for in the context of WDM?
SOAP stands for Spectrometric Oil Analysis Program.
What is one advantage of detecting mechanical failure early?
One advantage is that it minimizes the cost of remedial action.
How does early failure detection assist maintenance planning?
It assists with maintenance planning by identifying potential issues before they escalate.
What is the significance of ensuring fluid has no contamination?
It ensures that there is no contamination which could cause damage to the system components.
What is the typical EFD procedure frequency?
EFD is carried out at the frequency laid down in the relevant maintenance manual.
When should EFD be performed on new or repaired assemblies?
EFD should be performed on a new, repaired, reconditioned, or disturbed assembly subject to sampling as detailed in the Work Card or maintenance procedure.
What is the recommended EFD timing after installation?
EFD should be performed after post installation ground run.
When should EFD be conducted after flying hours?
EFD should be conducted on completion of 5 - 10 flying hours.
What is the final sample requirement before replacement?
EFD should be conducted as a final sample prior to replacement.
When can EFD be performed at any time?
EFD can be performed at any time analysis would be of advantage to the user unit, e.g., heavy landing, blade-strike, over torque, etc.
What tools are used for EFD work?
The necessary tools are contained in a special type trolley.
How can Magnetic Probes be identified?
Magnetic Probes and their housing can be colour coded for identification purposes.
What is mandatory before working with dangerous fluids?
It is mandatory to read the COSHH (Control of Substances Hazardous to Health) and SDS (Safety Data Sheets) as all oils are different.
What is the first step in the typical procedure for handling a magnetic probe?
Ensure the area around the magnetic probe is clean.
What should you do after removing the magnetic probe from equipment?
Wash the probe in a non-magnetic container.
How should the probe be examined?
Visually examine the probe using an X6 magnifier.
If any debris is considered to be abnormal, inform your supervisor - QUARANTINE pending further analysis by EFD cell.
How should debris be transferred for analysis?
Transfer debris onto a 2” length of cellotape by pressing the magnetic tip of the probe against the adhesive side of the tape. Attach the tape to the back of the sample card.
What details should be recorded on the sample card?
The sample card will be filled in with the aircraft details obtained from the MoD F700 and the work carried out will be recorded in the MoD F700.
What should be done with ‘O’ rings during the procedure?
Remove ‘O’ rings, clean and inspect the plug, check the probe for magnetism (should be able to lift three steel balls), and check Bayonet Lock Pins.
What should be done after inspecting the ‘O’ rings?
Lightly oil ‘O’ rings with system lubricant and replace the probe, ensuring that the probe is locked by a turn-and-pull action.
What should you ensure when refitting a magnetic plug during a DFS or TFS?
Ensure that you DO NOT disturb the debris on the probe during re-fitting.
When is the SOAP procedure carried out?
SOAP is carried out at the frequency laid down in the relevant maintenance manual, on new/repaired/reconditioned or disturbed assemblies, after post installation ground run, on completion of 10 flying hours, as a final sample prior to replacement, on recommendation of Wear Debris Section, and at any time analysis would be of advantage to the user unit.
What forms are used for SOAP records?
MoD Form 730 (MIG) accompanies each sample bottle, and MoD Form 730C is a self-adhesive label for each sample bottle.
When should samples be taken?
Samples are to be taken within 30 minutes of shut down after a running time of at least 15 minutes, and before any replenishment.
What cleanliness measures must be observed during sampling?
Strict cleanliness is to be observed and no intermediate container may be used to prevent contamination of the sample.
How full should the sample bottle be?
The sample bottle should be at least half full.
What is mandatory before conducting Spectrometric Oil Analysis?
It is mandatory to read the COSHH and SDS (Safety Data Sheets) as all oils are different.
What methods are used for sampling?
The methods include Dip Tube and sampling through a magnetic probe.
