PWS Milacron Grinder.pdf

PERFORMANCE-BASED WORK STATEMENT

FOR

RETROFIT/REBUILD OF A CINCINNATI MILACRON GRINDER, MODEL 476

PLAIN, SERIAL NO. 44088

TH

CMXG / 532 CMMXS LANDING GEAR SQUADRON

Revised

2 August 2011

PERFORMANCE-BASED WORK STATEMENT

TABLE OF CONTENTS

SECTION PAGE

1 DESCRIPTION OF SERVICES 3

2 SERVICES SUMMARY 6

3 GOVERNMENT FURNISHED PROPERTY AND SERVICES 7

4 GENERAL INFORMATION 7/10

5 APPENDICES 10/17

DESCRIPTION OF SERVICES. This Performance-based Work Statement (PWS) is for the retrofit/rebuild of a Cincinnati Milacron Grinder, Model 476 Plain, Serial No. 44088

Preventative Maintenance Number 1391 at Hill AFB, Utah 84056. All work will be accomplished at Hill AFB. This period of performance for this contract will be 12 months.

1. BASIC SERVICES. The contractor shall provide the labor, tools, materials and equipment necessary to repair/rebuild/retrofit a Cincinnati Milacron Grinder. The contractor shall provide and retrofit a GE FANUC 0I Controller to the grinder. The grinder shall also be rebuilt to the following requirements and shall meet the original equipment manufacturers (OEM) tolerances and accuracies.

1.1. Main Components.

All mating surfaces shall be cleaned, inspected, checked for corrosion and flatness and repaired as required. All castings shall be inspected for excessive wear, cracks, distortion, or other damage. Contractor shall document the following:

A. Function of the casting

B. Effect of the crack on the structural strength and its possible repair.

C. Effect on the alignment and operability of the machine.

D. Probability of successfully repairing the cracked casting.

E. Cost of a new casting.

F. Rebuild completion delay for purchasing/repairing casting.

1.1.1 Headstock. Bearings: shall be checked for trueness and the mating surfaces shall be checked for corrosion and repaired as required. Headstock Rotation: shall be infinitely variable speed in accordance with (IAW) APPENDIX B, TABLE I of this PWS. Taper adjustment for the headstock mechanism shall be cleaned and entire system be repaired to ensure that the air assist system can ease in the adjustment.

1.1.2 Wheel head Rotation: shall be variable infinitely speed in accordance with (IAW)

APPENDIX B, TABLE I of this PWS. A load meter shall be installed on the control panel that will reflect the pressure on the grinding wheel.

1.1.3 The dressing system shall be cleaned inspected and repaired as required.

1.1.4. Steady Rest mating surfaces on machine shall be cleaned inspected and repaired as required. Steady Rest bearings shall be replaced with OEM bearings and Steady Rest adjustment arms shall be clean and repaired as required.

1.2. Coolant System

1.2.1. A means shall be provided to filter the coolant prior to returning to the coolant tank. The coolant shall be filtered to less than 5 micron’s prior to returning it to the grinding wheel and the component being ground.

1.2.2. The contractor shall provide gravity bed paper-band filtration/Coolant Tank with 50 gallon tank size capable of 25gpm. Coolant tank will accommodate paper 20” Length x 4.5” Diameter.

Contractor shall provide coolant on and off by the numeric control as well as electronic override by the operator.

1.4. Mechanical

1.4.1. The contractor shall install new ball screws on the X and Z-Axis to support the accuracies and repeat abilities listed in APPENDIX B, TABLE II of this PWS. Ballscrews shall be properly sized to meet the duty cycle requirements of this application to ensure years of operation. If the ways are worn and impair the repeatability and accuracy of the X and/or Z-Axis, the contractor shall repair the ways.

1.4.2. The contractor shall replace all damaged gaskets, seals, o-rings, bearings, way wipers, belts.

1.4.3. The contractor shall repair or replace all worn parts that do not meet OEM tolerances.

1.5. Oil Systems

1.5.1. The hydraulic power unit shall be replaced with a new hydraulic power pack suitable size to meet the requirement of the machine.

1.5.2. The lubrication system shall be completely disassembled, cleaned, and inspected.

Defective components will be replaced with new components and shall meet OEM standard or better. The oiling system shall be tested at the manufactures operating pressure.

1.6. Driving Mechanism: The driving mechanism, for the grinding wheel head assembly, shall be powered by an electric AC driven brushless motor, with belt and pulley arrangement or direct drive by electric motor. If belt driven, means shall be provided for adjusting belt tension unless belt tension is maintained automatically.

1.7. Cycles: Contractor shall remove the existing controller and replace with a GE Fanuc 0I CNC control package.

1.7.1. Dressing Cycle: Dressing cycle shall allow for wheel dressing subroutine anytime during the grinding cycle. Once initiated, the grinding wheel shall retract, headstock stop, table traverse out so the grinding wheel is in position to dress, dresser activates, wheel dresses according to subroutine, dresser deactivates, table traverse so that the grinding wheel is back inside the component, returns to a standoff position and the grinding cycle resumes. Controller shall be able to compensate for dressing. Head Stock shall turn off while dressing.

1.7.2. Automatic Feed: The machine shall be designed with automatic infeed of the abrasive grinding wheel for traverse grinding operations. Selectors shall be provided for controlling in feed increments at desired reversal(s) and for limiting the total infeed for the overall grinding cycle. The wheel feed mechanism shall be actuated upon each or alternate reversals of the table’s longitudinal movement at the choice of the operator.

1.7.3. Manual Control: A portable hand held pendent, with a manual pulse generator will be provided to control X, Z, and C axis.

1.7.4. Automatic Cycle: An automatic cycle shall be provided for plunge and traverse grinding.

After setup for automatic cycle, the operator shall only be required to load the work piece, start the cycle by a single control and unload the work piece.

1.8. Electrical

1.8.1. All electrical/electronics components shall be replaced to include but not limited to junction boxes, limit switches, selector switches, pressure switches, float switches, pushbuttons, solenoids, clutches, and wires.

1.9. Functional Test: The system shall be operated at a no load condition for not less than 12 hours. Proper operation of all controls, motors, adjusting mechanisms, and other accessories shall be verified during the test period. If the system fails under the no load testing, the deficiencies shall be corrected, and a new 12-hour test block shall be initiated. Functional testing shall continue until the upgraded grinder system can operate properly, with no deficiencies, for

12 continuous hours.

1.9.1. As part of the above, the contractor shall verify all automatic and manual cycles are in working order.

1.9.2. After the system has passed the test required by this PWS, the system will be accepted by the Government Representative (GR). The GR will sign the test report indicating that the test was witnessed by a representative of the using activity, and that the test was performed satisfactorily.

The contractor shall generate the Acceptance Test Plan in accordance with CDRL (A001/DI-

QCIC-80553A).

1.10. Manuals: The contractor shall assemble, generate, and supply, the updated Commercial

Off-The-Shelf (COTS) manuals that reflect all changes to the grinding machine and its related system.

The contractor shall generate the Revised Technical Data for Rebuilt Industrial Plant Equipment in accordance with CDRL (A002/DI-MISC-80094/T).

1.11 Guarding: All guarding shall be in accordance with OSHA 1910.212. OSHA 1910.215 specifically covers abrasive wheel machinery.

1.11.1 Dead man switch shall be provided and work in conjunction with the hand held pendent during manual mode and in conjunction with chain interlock in section 1.11.1.

1.11.2 Barrier guarding will be provided to guard the back side of work head preventing personnel entering work envelope from the coolant tank side of machine. This barrier will be removable and be able to be adjustable to cover entire length of work area.

1.11.3. Design drawings will be approved by a Hill Air Force Base Government Representative

(GR) prior to guarding installation. The contractor shall generate the CONCEPTUAL DESIGN

DRAWINGS/MODELS in accordance with CDRL (A003/DI-SESS-81001D/T) See above.

1.11.4. Pulley and Belt Guarding: All pulleys and belts will be covered and guarded to prevent access during automatic operation. All pulleys and belts that are covered will be accessible during setup operations.

1.12. Training requirements.

The contractor shall provide a maximum of 40 hours of training. Twenty (20) hours for mechanical training for two personnel, and twenty (20) hours for operational training for two personnel. The contractor shall complete the training within seven working days after the completion of the functional testing. Subject matter will be at the discretion of the Project

Manager. Subject matter will include mechanical, electrical, and operations. This training will be provided upon final functional testing outlined in paragraph 1.9.

2. SERVICES SUMMARY.

Performance Objective PWS

Para

Performance Threshold

Main Component

Inspection/Replacement

1.1 Thru

1.8.1.

Every Component mentioned in the PWS will be inspected and or replaced after successful functional testing with zero deficiencies.

Functional Testing 1.9 Operated at a no load condition for not less than 12 hours. System failure shall be corrected and a new 12-hour test shall be initiated. Functional testing continues with no deficiencies for 12 continuous hours.

Test Plan Report 1.9.2 Delivered by the 3rd work day after successful functional testing. Delivered with zero (0) deviations. (CDRL A001)

Manuals 1.10 Delivered by the 3rd work day after successful completion. Delivered with zero

(0) deviations. (CDRL A002)

Guarding design 1.11.4 Conceptual drawings due within 30 working days of award. Delivered with zero (0) deviations. (CDRL A003)

Training 1.12 The contractor shall provide a maximum of

40 hours of training. Twenty (20) hours for mechanical training for two personnel, and https://assist.daps.dla.mil/quicksearch/basic_profile.cfm?ident_number=204786 twenty (20) hours for operational training for two personnel. The Contractor shall complete the training within seven working days after the completion of the functional testing.

3. GOVERNMENT FURNISHED PROPERTY AND SERVICES

4. GENERAL INFORMATION.

4.1 Security Requirements.

4.1.1 The Program Manager (PM) will provide forms access link to the contractor with the

“Unescorted Entry Authorization Certificate” (AF Form 2586) for each employee requiring entry into controlled areas. The contractor can access this link at: Http://www.epublishing.af.mil. The contractor shall complete the forms and return them to the PM. The PM will request access to the controlled area from the Security Office (309 CMXG/OBM) located in Building 507 Room 210.

Once approved by the Security Office, the contractor can submit the forms to Pass and Registration (West Gates Visitor Center) for the Unescorted Entry Badge. The PM point of contact will be given to the contractor after award of contract.

4.2 Quality Assurance.

4.2.1. Quality Assurance. The contractor shall employ his commercial quality control program/procedures to ensure services are provided as required. The contractor shall provide a copy of his quality control program/procedures to the Contracting Officer upon request.

4.3. Quality Control. The government will periodically evaluate the contractor’s performance by appointing a representative(s) to monitor performance to ensure services are received. The government representative will evaluate the contractor’s performance through inspections of the contractor's quality control program. The government may inspect each task as completed or increase the number of quality control inspections if deemed appropriate because of repeated failures discovered during quality control inspections or because of repeated customer complaints. Likewise, the government may decrease the number of quality control inspections if merited by performance. The government will also investigate complaints received from various customers located on the installation. The contractor shall be responsible for initially validating customer complaints. However, the government representative shall make final determination of the validity of customer complaint(s) in cases of disagreement with customer(s).

4.3.1 Contracting Officer’s Representative (COR):

4.3.2 The Contracting Officer’s Representative (COR(s) is the authorized government representative(s) who will perform assessments of the contractor’s performance. Subsequent to contract award, the identity of the COR(s), with a letter defining their duties and authority will be promptly furnished to the successful bidder/offeror.

4.3.3 The COR(s) or alternate(s) will inform the contract manager in person when discrepancies occur and will request corrective action. The COR(s) or alternate(s) will make a notation of the http://www.epublishing/ discrepancy on their assessment checklist with the date and time the discrepancy was noted and will request the contract manager (or authorized representative) to initial the entry on the checklist.

4.3.4 Any matter concerning a change to the scope, prices, terms, or conditions of this contract shall be referred to the Contracting Officer and not to the COR(s).

4.3.5. The services to be performed by the contractor during the period of this contract shall at all times and places are subject to review by the Contracting Officer or authorized government representative(s).

4.4. Physical Security. The contractor shall be responsible for safeguarding all government property provided for contractor use. At the close of each work period, government facilities, property, and materials shall be secured.

4.5. Hours of Operation.

4.5.1. Normal Hours of Operation. The contractor shall perform the services required under this contract during the following hours: Monday through Friday 0600 to 1530. The contractor may work, with prior approval of the Contracting Officer, extended hours to ensure timely completion of work at no additional cost to the government.

4.5.1.1. Recognized Holidays. The contractor is not required to provide service on the following days: New Year’s Day, Martin Luther King Day, Presidents Day, Memorial Day, Independence

Day, Labor Day, Columbus Day, Veterans Days, Thanksgiving Day, and Christmas Day. If the holiday falls on Saturday, it is observed on Friday. If the holiday falls on a Sunday, it is observed on Monday.

4.6. Conservation of Utilities. The contractor shall instruct employees in utilities conservation practices. The contractor shall be responsible for operating under conditions, which prevent the waste of utilities, which include the following:

4.6.1. Government telephones shall be used only for official government business.

4.7. Records. The contractor shall be responsible for creating, maintaining, and disposing of only those government-required records that are specifically cited in this PWS or required by the provisions of a mandatory directive listed in Applicable Publications and Forms. If requested by the Government, the contractor shall provide the original record or a reproducible copy of any such record within five working days of receipt of the request.

4.8. Environmental Controls:

4.8.1. Compliance with Laws and Regulations. The contractor shall be knowledgeable of and comply with all applicable Interstate, Federal, State, and Local laws, regulations, and requirements regarding environmental protection. In the event environmental laws/regulations change during the term of this contract, the contractor is required to comply as such laws come into effect. If there is an increase or decrease in cost as a result of the change, the contractor shall inform the Contracting Officer pursuant to notice requirements and negotiate a modification to the contract.

4.8.2. Notification of Environmental Spills. If the contractor spills or releases any substance into the environment listed in 40 CFR Part 302 Protection of the Environment, the contractor, or its agent shall immediately call 911. If the call is made from an on base phone, it will go directly to

Hill AFB dispatch. If using a cell phone it will go off base, ask the 911 dispatcher to be transferred to Hill AFB. The liability for the spill or release of such substances rests solely with the contractor and its agent.

4.8.3. Material Storage and Use. The contractor shall follow manufacturer’s guidelines and professional recommendations for control of humidity, temperature, cleanliness, and materials handling. This includes hazardous materials.

4.8.4. Mishap Reporting. The contract shall report any mishap to the contracting safety office as well as the contracting officer for all incidents resulting in damage to Air Force property. The contractor shall cooperate with any and all government investigations. Additionally, the contractor shall secure the mishap scene and impound evidence/wreckage until released by the government-contracting officer. The contractor shall provide copies to the contracting officer of data related to the mishap, such as contractor analyses, test reports, summaries of investigations, etc. as necessary to support a government investigation.

4.9. Government Observations Government personnel, other than contracting officers (COs) and contracting officer’s representatives (CORs), may from time-to-time, with CO coordination, observe contractor operations. However, these evaluators may not interfere with contractor performance or make any changes to the contract.

4.10. Special Qualifications. None

4.11. PUBLICATIONS:

4.11.1. Compliance with all publications, regulations and operating instructions provided by the

Government is required when:

4.11.2. They pertain to the procedures for materials expediting herein and where the contractor is authorized by the statement of work to accomplish the work specified in the publication, regulation, or operating instructions.

4.11.3. The publications prescribe USAF policies, use of materials, procedures and processes applicable to the work requirements.

4.11.4 The contractor shall acquire and work on the latest version of the publication.

5. SAFETY REQUIREMENTS. See Appendix C.

5.1.1. Items proposed shall be warranted as is customary in the trade. The standard commercial warranty, if applicable, shall apply to items offered in response to this solicitation. Offerors are requested to include a copy of each applicable warranty with their response to this solicitation.

Warranty is to start when the Government Representative (GR) makes the final buy off.

6. APPENDICES

A. Acronyms & Abbreviations List

B. Estimated Workload Data

C. Safety Coordination

APPENDIX A

ACRONYMS AND ABBREVIATIONS LIST

Acronym/Abbreviation Definition

AF Air Force

AFB Air Force Base

AFMC Air Force Material Command

CA Contract Administrator

CFR Code Federal Regulation

CNC Computer Numerical Control

CO Contracting Officer

COR Contrqacting Officer’s Representative

COTS Commercial Off-The-Shelf

DEPT Department

DOD Department of Defense

FAR Federal Acquisition Regulation

GR Government Representative

IAW In Accordance With

NAICS North American Industrial Classification Systems

OEM Original Equipment Manufacturers

OSHA Occupational Safety and Health Act

PBSA Performance Based Service Acquisition

PCB Polychlorinated Biphenyls

PM Program Manager

PWS Performance-Based Work Statement

QA Quality Assurance

QCP Quality Control Program

SIC Standard Industrial Classification

USAF United States Air Force

APPENDIX B

ESTIMATED WORKLOAD DATA

EQUIPMENT ITEM MODEL NUMBER SERIAL NUMBER

Cincinnati Milacron

Grinder

Model 476 Plain 44088

TABLE I

SPEEDS AND FEEDS

Headstock Speed in RPM Variable from 0 to 200

Wheelhead Speed in RPM Variable from 0 to 10,000

Table Traverse Inches per Minute Variable from 0 to 100

Test to be applied: Permissible

In feed adjustments:

Automatic in feed at table reversal, diameter reduction, range, inches 0.0001”

In feed motion of wheel slide shall include a quick approach to the work piece repeats accurately to grinding position (6 repetitions), fine in feed 0.00005”

Encoder position measuring system shall have a resolution of 0.00001”

Head Stock TIR. 0.0001”

Table Travel TIR .0002”/ 25” of travel

Z-Axis to workpiece center line OEM Specifications

APPENDIX C

OGDEN AIR LOGISTICS CENTER

UNITED STATES AIR FORCE

HILL AIR FORCE BASE, UTAH 84056

SAFETY, FIRE PROTECTION AND HEALTH SPECIFICATION

INDUSTRIAL SAFETY REQUIREMENTS

TYPE WORK: RETROFIT/REBUILD OF A CINCINNATI MILACRON GRINDER,

MODEL 476 PLAIN, SERIAL NO. 44088

PREPARED BY: Tim Helms, 309 MXW/QPE, DSN 586-6038

SECTION I - GENERAL REQUIREMENTS

A. Safety Program Requirements.

In context with AFMC Acquisition Reform initiatives, contract language will now focus on ensuring safety objectives are met through contractor risk management rather than the traditional method of providing specific government guidance for risk elimination. With this new

“performance-based” language, the government will provide the contractor with areas of concern

(Protection of government personnel and property) and the contractor will be free to meet those objectives in a manner that is consistent with corporate standards. The contractor will implement a safety program plan that ensures protection of Government personnel and property. The program will consist of, as a minimum:

1. Mishap reporting, as defined in paragraph B1 below.

2. A Safety Plan and corresponding site specific checklist that addresses, as a minimum, the subjects listed in Section II –Specific Requirements, and will be used during the performance of the work described in the contract. The Safety Plan and checklist will be approved by 309

MXW/QPE (Safety Office) prior to commencement of any work described in this contract.

3. Routine and recurring surveillance to ensure the safety requirements of this contract are enforced.

4. Competent personnel to provide surveillance of the Safety Plan.

5. Identification of segregated work site locations for operations that cannot be co-mingled with general industrial operations and the process for ACO approval of operations and changes at these specific sites.

6. All contractor personnel shall be trained and qualified to perform their duties safely.

7. The contractor shall include a clause in all subcontracts requiring the subcontractors to comply with the safety provisions of this contract, as applicable.

B. Mishap Notification

1. The contractor shall notify 309 MXW Safety (Phone (801) 777-3972) who in turn will notify

75 ABW/SEG ((801) 777-3333) or 309 Wing Operations Center ( (801) 777-3238), or the Hill

AFB Command Post (777-3007) after normal duty hours, and the designated Government

Representative, i.e., the ACO, PCO, or QAE within one (1) hour of all mishaps or incidents at or exceeding $2,000 (material + labor) in damage to DOD property entrusted by this contract, even if the government is wholly or partially reimbursed. This notification requirement shall also include physiological mishaps/incidents. A written or email copy of the mishap/incident notification shall be sent within three calendar days to the GR, who will forward it to 309 MXW

Safety. For information not available at the time of initial notification, the contractor shall provide the remaining information no later than 20 calendar days after the mishap, unless extended by the ACO. If any portion of this contract supports 309 AMARG, Davis-Monthan

AFB, AZ please contact the AMARG Safety Office at DSN 228-8560 or Comm. (520) 228-8560 to report any mishaps or safety concerns.

Mishap notifications shall contain, as a minimum, the following information:

(a) Contract, Contract Number, Name and Title of Person(s) Reporting

(b) Date, Time and exact location of accident/incident

(c) Brief Narrative of accident/incident (Events leading to accident/incident)

(d) Cause of accident/incident, if known

(e) Estimated cost of accident/incident (material and labor to repair/replace)

(f) Nomenclature of equipment and personnel involved in accident/incident

(g) Corrective actions (taken or proposed)

(h) Other pertinent information

2. Ensure government contract lease agreements determine convening authority prior to executing the contract/lease agreements, and that all contracts ensure the following, IAW AFI

91-204, paragraph 2.4.6:

The contractor will support and comply with the safety investigation and report requirements of AFI 91-204

A record of all mishaps involving Air Force resources will be entered into the Air Force reporting system

A record of mishaps involving other DoD resources will be forwarded to the involved agencies

When a mishap involves a contract managed by DCMA, DCMA safety personnel will review the final safety report and send their response to HQ AFSC

3. Ensure contract/lease agreements for aerospace vehicles state: The Air Force is responsible for the investigation of mishaps involving aerospace vehicles. The Air Force is authorized to investigate mishaps involving non-accepted Air Force aerospace vehicles (Non-delivered vehicles for which the government has accepted responsibility; DD Form 250. Material

Inspection and Receiving Report, HAS NOT been executed).

4. If requested by authorized government personnel (ACO, PCO, QAE, safety representative, Fire Department, and Security Forces), the contractor shall immediately secure the mishap scene/damaged property and impound pertinent maintenance and training records, until released by safety investigators.

C. General Safety Requirements:

If the safety plan is modified, the contractor shall submit the proposed modification, in writing, to the Contract Administration Office safety representative.

Follow all applicable federal, USAF, state, and local safety directives outlined in Section

II below.

Ensure assigned personnel are adequately trained and qualified for the task being performed. Brief all personnel on the hazards involved with operations and applicable precautions to be taken. Should unidentified hazards arise, cease operations until actions are taken to eliminate or mitigate hazards to safe levels.

Contractor personnel must receive Explosive Safety Awareness Training if their duties require entry into the Explosive Clear Zone. This training will be provided by the 309 MXW

Safety Office.

For emergencies on Hill AFB contact 911 ask to be transferred to Hill AFB 911 to report any emergency.

SECTION II – SPECIFIC REQUIREMENTS

The contractor’s prepared Safety Plan shall:

Demonstrate a management commitment to employee safety and health

Identify applicable rules and regulations

Identify the roles and responsibilities of Management, Supervisors, Employees and

Safety Coordinator

Identify work to be performed and location of expected operations

Provide a description of safety program, safety monitoring responsibilities, organizational structure, and contact information for on-site personnel

Include a work hazard analysis of the worksite and operations to be performed to include baseline hazard identification and required control measures

Identify employee safety and health training requirements and the documentation process

Include emergency response plans and procedures that relate to protection of government personnel and property

Include a workplace inspection frequency, to include the identity of the individual responsible for conducting the inspection

Include hazard reporting procedures and identify individual(s) responsible for the correcting identified hazards

Identify first aid and injury procedures

Identify procedures for accident reporting and investigation

Identify the process for tracking controlled hazards in contractors work area

Provide a facility description to include the electrical wiring and fire protection systems

(i.e., fire suppression, fire detection, fire extinguishers, fire walls, etc.), required equipment and any other items necessary to fulfill the elements referenced below for the protection of government personnel and property. The contractor’s safety plan shall meet or exceed the referenced standards below.

The authorized Government Representative (309 MXW Safety Office) shall approve the contractor’s procedures within the Health and Safety Plan as meeting the intent of the below referenced standards, with the exception of Mishap Notification /Reporting Procedures, which are outlined in Section I, paragraph B of this Appendix C.

Element/Requirement Referenced Benchmark

Contract Safety *AFPAM 91-210 Para. 6

Mishap Notification/Reporting Appendix C, Section 1B

*AFI 91-204 Para. 4.9

Facility Fire Protection NFPA 13, 70, & 72

NFPA 409/410

*AFOSH STD 91-501 Para. 6.2.4.5, 6.2.9, 6.2.10, 6.2.11, and 6.2.17

*Follow web link to obtain direct access to these documents http://www.e-publishing.af.mil/shared/media/epubs/AFPAM91-210.pdf http://www.e-publishing.af.mil/shared/media/epubs/AFI91-204.pdf http://www.e-publishing.af.mil/shared/media/epubs/AFOSHSTD91-501.pdf