Multi period phased sparing lcc
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IMP Aerospace. Multi-Period Phased Sparing & LCC. By: Parker MacDonald Logistics Support Analyst. November 2013. IMP Aerospace, P.O. Box 970, Enfield, Nova Scotia, Canada B2T 1L5 Tel. 902. 873.2250 • Fax 902 873 2290 • e-mail. [email protected] Website. www.impgroup.com.

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Multi-Period Phased Sparing & LCC

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Multi period phased sparing lcc

IMP Aerospace

Multi-Period Phased Sparing & LCC

By: Parker MacDonaldLogistics Support Analyst

November 2013

IMP Aerospace, P.O. Box 970, Enfield, Nova Scotia, Canada B2T 1L5

Tel. 902. 873.2250 • Fax 902 873 2290 • e-mail. [email protected]

Website. www.impgroup.com


Multi period phased sparing lcc

IMP: Who We Are

  • Who We Are

  • 100% Privately Held Canadian Company founded in 1967

  • Headquartered in Halifax, Nova Scotia

  • Over 4,500 Employees (> 2,500 in Nova Scotia)

  • Operations Across Canada

  • Dedicated Support to the Crown/PWGSC for over 30 Years

  • Provide support to 6 RCAF aircraft fleets, including Optimized Weapons Systems Support to the Cormorant, C130 and CP140

  • Comprehensive avionics, component and structural manufacturing capabilities

  • Extensive Engineering, ILS and Publications Capabilities

  • Ready to provide support immediately

  • Top 100 Best Companies to work for in Canada

2


Multi period phased sparing

Multi-Period (Phased) Sparing

  • Schedule Change

    • Can change depending on numerous factors

    • May be planned to fluctuate from day 1

  • Change of Fleet Size

  • Change in Operating Hours

  • Analyzer not currently set up to accommodate life cycles with differing parameters during different periods.


Aircraft schedule

Aircraft Schedule

  • 2007 plan:

    • 18 AC until 2015

  • 2009 plan:

    • 18 AC until 2015, 11 AC until 2025

  • 2011 plan:

    • 18 AC until 2020, 14 AC until 2030

  • Current plan = 18 AC total until 31 Dec 2015 and 14 AC between 1 Jan 2016 – 31 Dec 2030


Aircraft schedule changes

Aircraft Schedule Changes


Flying operating hours

Flying / Operating Hours

  • Generally the Fleet Flying hours (FHrs) per year = 6,500hrs

  • As the fleet size goes down, the AC must work longer, harder hours

  • FHrs = Operating hours


Spares required after reduction

Spares Required after Reduction

  • DND has just informed us that the schedule for our AC has changed

  • 20 AC, 6,500 Fhrs per year reduced to:

  • 10 AC, 6,500 Fhrs per year

  • Spares Required?


Spares availability after reduction

Spares Availability after Reduction


Or they end up here

Or they end up here


Multi period phased sparing1

Multi-Period (Phased) Sparing

  • To gauge the number of spares required when you have differing parameters in multiple time periods you must create separate models for each period.

  • Combine the results from each sparing analysis to get a final count.

    Period A spares + Period B spares =Total spares Required

  • Sounds Simple?


Discards and plt

Discards and PLT

  • This is run with a Procurement Lead Time (PLT) of 6 months

  • The Period is 3 years

Analyzer says we need 7 spares.

What is wrong with that statement?


Discards and plt1

Discards and PLT

  • Same 3 year model, but PLT of 37 months

  • PLT of 37 months means new stock can’t be acquired

  • Discarded units are included in New Stock required

3.42 Discards per year X 3 years = 10.26 units

Add to the 3 units required = 13.26 units


Discards and plt2

Discards and PLT

  • Most LRU’s and SRU’s will never have a discard rate of 3.42 per year

  • But a discard rate of 0.2 per year, over 20 years = 4 units

  • If that item is $100,000 each, that is a big deal

  • Very useful for consumables


Discards vs no discards

Discards vs No Discards

  • AC Main Landing Gear Tires

    • Wear Out at 200 FHrs

    • Each AC flies 360 FHrs per year

  • With PLT set to 6 months (no discards included) = 30 tires until Dec 31, 2030.

  • With PLT set to max (discards accounted for)= 772 Tires required

  • At a cost of $1,000 each, you want to make sure you account for your discards.


Baseline configuration

Baseline Configuration

  • No UDS Spares

  • 20 AC

  • Retirement Date Dec 31, 2030 (17 years)

  • 9,600 Operating Hrs per Year = 40 Op Hrs/AC/Month

  • 10 AC at East and West Coast Bases

  • 3 LOM (1st, 2nd, Contractor)

  • 98% Operational Availability


Baseline spares provisioning

Baseline Spares Provisioning

  • 17 year period (2030)


Stock on hand

This column shows how much should be on hand at all times for X% Operational Availability

Stock on Hand


Discards

Discards

  • How many spares required to make Retirement date of 2030?

  • Original = 14 units = $38,700

  • Actual = 14 units + 49 discarded units = $228,200


205 month 17 year 1 month plt

205 month (17 year +1 month) PLT


Baseline schedule

Baseline Schedule

  • Baseline Schedule has 20 AC, 9,600 FHrs per year

  • 10 West Coast, 10 East coast

  • 9,600 Operating Hrs per Year = 40 Op Hrs / AC / month

  • Retirement date of Dec 31, 2030


New schedule

New Schedule

  • Dec 31, 2020: Fleet reduced to 10 AC

  • Flying rate will remain 9,600 FHrs per year (fleet rate).

  • More or less spares Required?


Two models

Period A

20 AC

Jan 2014 – Dec 2020

9,600 FHrs per year

40 FHrs per month / AC

Begin with 0 stock

Period B

10 AC

Jan 2021 – Dec 2030

9,600 FHrs per year

80 FHrs per month / AC

Begin with SOH at end of Dec 2020

Two Models


Period a jan 2014 dec 2020

Period A: Jan 2014 – Dec 2020

  • We can see that the number of units required on hand at all times is the same as Period A, with no discards.

LRU 2 – 12 Discards

SRU 1B – 7 Discards

SRU 2A – 2 Discards


Transition from a to b

Transition from A to B

  • We must take the number of spares remaining (after discards) at the end of Period A (Dec 31, 2020) and put them in the stock on hand at the beginning of the Period B model (Jan 1, 2021).


Period a vs b constants

Period A

20 AC

Jan 2014 – Dec 2020

9,600 FHrs per year

40 FHrs per month / PE

Begin with 0 stock

Period B

10 AC

Jan 2021 – Dec 2030

9,600 FHrs per year

80 FHrs per month / PE

Begin with SOH at end of Dec 2020

Period A vs B Constants


Period b jan 2021 dec 2030

Period B: Jan 2021 – Dec 2030

  • Additional spares for all but SRU 1A because AC now working harder

LRU 2 - 17 Discards

SRU 1B - 10 Discards

SRU 2A - 3 Discards


Period a period b sparing

Period A + Period B Sparing

To get UDS for Period B : (A New – A Discards) = B UDS

To Calculate Total number of Spares Required:

A New + B New = Total Spares Required


Oops forgot

OoPS fORgoT

  • This slide shows the outcome of not adjusting the FHrs / AC / Month.

  • Uses 40FHrs instead of 80FHrs

  • Make sure everything is updated correctly or you miss out on 19 spares and $74,000


Period b1 14 ac 20 fhrs

Period B1: 14 AC 20 Fhrs

  • This slide shows the outcome of a different Period B.

  • Uses 20FHrs instead of 80FHrs

  • Uses 14 AC instead of 10 AC


Life cycle cost lcc

Life Cycle Cost (LCC)

Adjust any LCC costs by the applicable inflation rate.

Change the Replacement cost of the TOP LEVEL PE to $0 to avoid Acquisition costs in period 2


Lcc results

LCC Cost Period A: $247,222

LCC Cost Period B: $69,131

Total LCC Cost: $316,353

Does not include the cost of spares purchased

LCC Results


Conclusions

Conclusions

  • You must include Discarded or Consumable units in Total Spares required.

  • Whatever stock you have at the end of one scenario is what you will have at the beginning of the next

    • Remember that if a spare is discarded, you can’t use that at the beginning of the next period.

  • A reduction in Fleet size, does not automatically mean a reduction in spares or cost.

  • This method requires you treat each time period as it’s own model.


Notes

Notes

  • Yes, This process works the same way when you already have AV stock to begin

  • With larger systems with more variance to the different parameters being used, you may not always arrive at the exact same number of spares vs discards, but you will be very close.

  • If your system has no discards, then use the same process; stock at the end of Period A = UDS stock at the beginning of Period B


Questions

Questions?

FIN


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