NAVAL POSTGRADUATE SCHOOL

1 NAVAL POSTGRADUATE SCHOOL . * Monterey, california (OF. DTIC. MELECTE. APR 0 8. THESIS y E. AN ANALYSIS OF THREE AVCAL INVENTORY MODELS. USING THE TIGER SIMULATION MODEL. C> by LLJ Mark David Sullivan ._J. cSeptember 1984. 9 Thesis Advisor: Richards Approved for public release; distribution unlimited. t ..* .. "-".. SECURITY CLASSIFICATION 'c 'NiS PAGE (When Dotes Entered). READ INSTRUCTIONS. REPORT DOCUMENTATION PAGE BEFORE COMPLETING FORM. 1. REPORT NUMBER 2 GOVT ACCESSION NO. 3 RECIPIENT'S CATALOG 4 UMBER. 4. TITLE (and Subtitle) S TYPE OF REPORT & PERIOD COVEREC. Master's Thesis.)

2 An Analysis of Three AVCAL Inventory September 1984. Models Using the TIGER Simulation Model - PERFORMING ORG. REPORT NUMBER. 7. AUTHOR(s) B CONTRACT CR GRAN' NUMBER(I). Mark David Sullivan 9. PERFORMING ORGANIZATION NAME AND ADDRESS 10. PROGRAM ELEMENT. PROJECT, TASK. AREA & WORK UNIT NUMBERS. NAVAL POSTGRADUATE SCHOOL Monterey, california 93943. $I. CONTROLLING OFFICE NAME AND ADDRESS 12. REPORT DATE. NAVAL POSTGRADUATE SCHOOL Sept mber 1984. Monterey, california 13. NUMBER OF PAGES. 14. MONITORING AGENCY NAME & ADDRESS(If different from Controlling Offce) 15. SECURITY CLASS.

3 (of thl report). Unclassified 1S. DECLASSIFICATtON, DOWNGRADING. SCHEDULE. 16. DISTRIBUTION STATEMENT (of this Report). Approved for public release; distribution unlimited 17. DISTRIBUTION STATEMENT (of the ebstract entered In Block 20, it different from Report). ". 1. IS. SUPPLEMENTARY NOTES. I9. KEY WORDS (Continue on reverse side if neceesey ard Identify by block number). AVCAL inventory models RIMAIR TIGER. ACIM operational availability simulation 20 ABSTRACT (Continue on reverse ede If neceeeary and Identify by block number). This thesis investigates the effectiveness of three AViation Consolidated Allowance List (AVCAL) inventory models in achieving aircraft system operational availability.

4 The three models studied are the Aviation * Supply Office (ASO) Model, the Repairables Integrated Model for Aviation (RIM-AIR), and the Availability Centered Inventory Model (ACIM). TIGER, a simulation model developed DD I FJAN M 1473 EDITION OF I NOV 65 1 *SECURITY. S N 0102- LF. 04. 6601 1 CLASSIFICATION OF TNIS PAGE (VIn Dell ntered). SECURITY CLASSIFICATIO14 OF THIS PAGE (ftaR Data Ent*V.*4- by NAVAL Seas Systems command, is amended to accommodate simulation of multiple aircraft sorties with a realistic parts pipeline operation. AVCAL model inventory levels are compared over a ninety day period utilizing availability statistics computed by TIGER.)

5 5 N 0 102- LF- 0 14- 6601. 2 _____. SECURITY CLASSIFICATION Of THIS PAOE(Whe" Data Entotod). Approved for public release; distribution unlimited An Analysis of Three AVCAL Inventory Models Using the TIGER. Simulation Model by Mark David Sullivan Lieutenant Commander, United States Navy , University of Louisville, 1974. Submitted in partial fulfillment of the requirements for the degree of MASTER OF SCIENCE IN OPERATIONS RESEARCH. from the NAVAL POSTGRADUATE SCHOOL . September 1984. Author: _ _ _ _ _ _ _ _ _ _ _. Mark D. Sullivan Approved by: _ __ _ _ _ _. Richards, Thesis Advisor McMasters, Second Reader Washburn V'.

6 Chairman, Department ,f Operations Research Marshall-, Dean of Information and Pol~vy Sciences 3.. "- .~- .. - .." ." .. -. ,-.., ' - - - - .- .- - - -, ,- . - S.. - - - ". ABSTRACT. I%. This thesis investigates the effectiveness of three AViation Consolidated Allowance List (AVCAL) inventory models in achieving aircraft system operational availability. The three models studied are the Aviation Supply Office (ASO). Model, the Repairables Integrated Model for Aviation (RIM-AIR), and the Availability Centered Inventory Model (ACIM). TIGER, a simulation model developed by NAVAL Seas Systems Command, is amended to accommodate simulation of multiple aircraft sorties with a realistic parts pipeline operation.

7 AVCAL. model inventory levels are compared over a ninety day period utilizing availability statistics computed by TIGER. / I 'A' f Accession For NTIS GRA&I. DTIC TAB 0. Unannounced 0. Justif icatio By Distribut ion/. Availability Codes Avirtil and/or Dist Special -i Otis 4. ~.. TABLE OF CONTENTS. I. INTRODUCTION---------------------------- ------------1. A. BACKGROUND------------------------------ --------1. B. PURPOSE--------------------------------- -------- 12. C. AIRCRAFT DATA----------------------------------- 12. D. MAJOR TOPICS---------------------------------- -- 13.

8 I. THE TIGER SIMULATION PROGRAM---------------------- 15. rA. INTRODUCTION---------------------------- -------- 15. B. MAIN FEATURES OF TIGER------------------------- 15. 1. Simulation------------------------------ ---- 15. 2. TIGER Statistics--------------------------- 17. 3. TIGER Subroutines-------------------------- 22. C. TIGER CHANGES--------------------------------- -- 23. 1. Aircraft Sortie Simulation---------------- 23. 2. Equipment: Repair and Resupply----------24. 3. New TIGER Subroutines-------------------- 25. 4. TIGER Validation------------------------- 26. II.

9 ASO MODEL----------------------------------- --------- 31. A. MODEL DESCRIPTION----------------------------- - 31. B. INVENTORY DETERMINATION----------------------- 33. 1. Attrition Rules---------------------------- 35. 2. Rotatable Pool Rules---------------------- 36. C. MODEL LIMITATIONS----------------------------- - 37. 5.. IV. RIMAIR MODEL ----------------------------------- 40. A. MODEL DESCRIPTION -------------------------- 40. B. INVENTORY DETERMINATION -------------------- 42. 1. Steady-state Supply Effectiveness ------- 42. 2. Optimization --------------------------- 45.

10 3. External Constraints -------------------- 50. C. MODEL LIMITATIONS -------------------------- 51. V. ACIM MODEL ------------------------------------- 54. A. MODEL DESCRIPTION -------------------------- 54. B. INVENTORY DETERMINATION -------------------- 56. 1. ACIM Solution Equations ---------------- 56. 2. Objective Function --------------------- 58. 3. Input Data ----------------------------- 62. C. MODEL LIMITATIONS -------------------------- 71. VI. TEST RESULTS ----------------------------------- 74. A. INTRODUCTION -- ----------------------------- 74. B. FIXED BUDGET ANALYSIS ---------------------- 77.