Ceiling-mounted bicycle lift FMEA

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Item & Function Failure Mode Effects of Failure S Causes of Failure O Design Controls D RPN Recomended Actions Responsibility & Deadlines Actions Taken S* O* D* RPN*
Nylon Rope
  • Connects various subassemblies allowing for bike height to be altered
Fractured Inoperative 9
  • Defective
  • Bad knot
  • Poor position
  • Over-stress
1
  • Inspection
  • Manual instructions
  • Manual instructions
  • Numerical evaluation
2 18 Testing Quality Control - 9 1 1 9
Deformed Operation impaired 7
  • Improper rope alignment
  • Fatigue / wear
5
  • Manual instructions
  • Numerical evaluation
1 35 Emphasis in manual Manual author - 7 2 1 14
Poor appearance 3
  • Improper rope alignment
  • Fatigue / wear
6
  • Manual instructions
  • Numerical evaluation
2 36 Emphasis in manual Manual author - 3 3 2 18
Latch
  • Holds rope in place
Slipping Intermittent operation 9 Defective latch 1 Rope Tie 2 18 Testing Quality control - 9 1 1 9
Erratic operation 8 Improper use 7 Rope tie 4 224 Emphasis in manual Manual author - 8 4 4 128
Oxidized Sticking 6 Poor Environment Protection 2 Material choice 2 24 - - - 6 2 2 24
Increased rope wear 7 Poor Environment Protection 2 Material choice 2 28 - - - 7 2 2 28
Inoperative 8 Poor Environment Protection 1 Material choice 1 8 - - - 8 1 1 8
Wood Screws
  • Attach assembly to ceiling
Fractured Inoperative 9
  • Old/rotting wood
  • Over-stress
1
  • Manual instructions
  • Numerical evaluation
2 18 - - - 9 1 2 18
Loosened Unstable 7
  • Old/rotting wood
  • Over-stress
4
  • Manual instructions
  • Numerical evaluation
2 56 Emphasis in manual Manual author - 7 2 2 28
Oxidized Unstable 7 Poor Environment Protection 2 Material choice 2 28 - - - 7 2 2 28
Inoperative 9 Poor Environment Protection 1 Material choice 1 9 - - - 9 1 1 9
Bolts
  • Attach various parts and sub-assemblies
Fractured Inoperative 9
  • Defective
  • Over-stress
1
  • Inspection
  • Numerical evaluation
2 18 Testing Quality control - 9 1 1 9
Loosened Unstable 7
  • Inadequate Maintenance
  • Over-stress
2
  • Manual instructions
  • Numerical evaluation
2 28 Maintenance Instructions Manual author - 7 1 2 14
Oxidized Unstable 7 Poor Environment Protection 2 Material choice 2 28 - - - 7 2 2 28
Inoperative 9 Poor Environment Protection 1 Material choice 1 9 - - - 9 1 1 9
Hooks
  • Hold Bicycle
Loosened Operation impaired 5
  • Inadequate tightening
  • Over-stress
5
  • Manual instructions
  • Numerical evaluation
2 50 Emphasis in manual Manual author - 5 2 2 20
Pulleys
  • Guide Rope
Jammed Inoperative 8
  • Poor position
  • Foreign Item
1
  • Manual instructions
  • Manual instructions
3 24 Emphasis in manual Manual author - 8 1 3 24
Sticking Operation impaired 4 Insufficient Lubrication Capability 2 Material choice 3 24 - - - 4 2 3 24
Cracked Erratic Operation 7 Defective 1 Inspection 2 14 Testing Quality Control - 7 1 1 7
Ceiling Brackets
  • Mount for most parts
Deformed Operation impaired 5 Over-stress 1 Numerical evaluation 2 10 - - - 5 1 2 10
Fractured Inoperative 9 Over-stress 1 Numerical evaluation 1 9 - - - 9 1 1 9
Oxidized Operation impaired 6 Poor Environment Protection 2 Material choice 2 24 - - - 6 2 2 24
Inoperative 9 Poor Environment Protection 1 Material choice 1 9 - - - 9 1 1 9
Rope tie
  • Holds rope if latch slips
Oxidized Operation impaired 5 Poor Environment Protection 2 Material choice 2 20 - - - 5 2 2 20
Increased rope wear 7 Poor Environment Protection 2 Material choice 2 28 - - - 7 2 2 28

*The Resulting RPN was calculated as an estimate.

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