PWS - B-52 Brake Housing.docx

Performance-Based Work Statement (PWS) b-52 bRAKE HOUSING IMPREGNATION

U.S AIR FORCE

309 commodities maintenance group (309 CMXG)

12/21/2021 i

TABLE OF CONTENTS

DESCRIPTION OF SERVICES

The contractor shall perform a chromate coating application and resin impregnation of Air Force supplied magnesium B-52 brake housings. The work will be performed at the contractor’s facility in support of the 309th Commodities Maintenance Group (309 CMXG) at Hill Air Force Base (AFB), Utah. The chromate coating is applied as a paint base and for corrosion protection. The resin impregnation is applied to prevent hydraulic fluid leakage through the porosity in the magnesium casting.

BASIC SERVICES

The contractor shall receive, treat, and return the brake housings to Hill AFB within 14 calendar days. No minimum or maximum ship set will be specified. Orders issued under this contract will be based upon our known requirements for the year and individual orders may be up to the full estimated amount for the year. The brake housings have no protective coating. In order to protect from humid air or shop environment that may accelerate corrosion, the contractor shall ensure to unpack just prior to processing. The contractor shall prevent damage to or the change to dimensions of machined surfaces. The contractor shall ensure that the internal housing passages remain free from contamination during the following treatment steps. Each housing weighs around 30 pounds. The alloy is AZ92 magnesium. The housings contain steel pins. Processing with the pins installed is authorized. The housings will be sent to the Contractor stripped of all coatings. They will be packaged dry with a desiccant and shipped to the contractor.

The following specific requirements apply:

Degrease and clean as necessary.

The contractor shall perform an initial dimension check on all brake housings per AMS-M-3171 Para. 4.5.5.

Immerse in chrome pickle per paragraph 3.4.1 of AMS-M-3171 for 2 to 10 minutes and rinse. Mechanical cleaning per AMS-M-3171 Para. 3.2.2 is not authorized. The chromic acid pickle, paragraph 3.4.1 is the only pickling solution authorized. The acid fluoride or hydrofluoric acid treatments that are part of the Type III treatment are not considered as pickling solutions.

The contractor shall inspect dimension change on all brake housings per AMS-M-3171 Para. 4.5.5 using any convenient uniform surface. Dimension change shall be within tolerance of AMS-M-3171 Table 2.

Apply a Type III coating in accordance with AMS-M-3171 Para. 3.6.3.

Resin impregnate in accordance with TO 4B-1-32 section 3.29 with the following exceptions. Use impregnating material qualified to MIL-I-17563C Class 1 or Class 3 rated for service at 400 degrees Fahrenheit. A suitable substitute to the Impco Desolve 292 product may be used if required to strip cured resin as called out in Paragraph 3.29 d. (3) (g). Metal stamping per paragraph TO 4B-1-32 Paragraph 3.29 d. (3) (h) is only required for magnesium housings that do not already have the “IMP” designation stamped on them.

Delivery/Shipment information. Shipment of parts to the Contractor will be the responsibility of Hill AFB. The contractor shall treat the brake housings and return to Hill AFB within 14 calendar days after receipt. The Contractor shall be responsible for return of the parts back Freight On Board (FOB) Hill AFB. Parts shall be packaged for return in the same containers and packaged the same as they were received from Hill AFB. Parts shall be returned to the following address:

532 CMMXS /MXDXAB

5760 Southgate Ave. (Bldg 507) Hill AFB UT 84056-5228 Data Deliverables:

A copy of the shop routing document certifying the completion of each process with an identifying stamp, signature, or initial and the date and the results of the dimension change per paragraph 4.5.5 of AMS-M-3171.

Services Summary

90% of documents fully complete with no discrepancies

90% of lots delivered within 14 calendar days after receipt

GENERAL INFORMATION

Government Furnished Property and Services Government Furnished Property will be identified and scheduled at the call level.

The brake housings will be identified at the call level on the Material Inspection and Receiving Report (DD250). The Contractor will complete the DD250 and return with completed Brake Housings for Government inspection and acceptance.

The government will inspect all items upon delivery to building 507. The Evaluation & Inspection Engineer in building 507 will perform the inspection. It shall be the responsibility of the contractor to pay for all shipping and re-repair of all government assets which fail the inspection upon receipt.

All government assets to include shipping containers will be inspected and documented for defects by the contractor prior to unpack and return of government assets. The contractor’s choice to forgo this standard places liability for damages solely on the contractor.

Contract Changes: Any matter concerning a change to the scope, prices, terms or conditions of this contract shall be referred to the Contracting Officer (CO).

Government Surveillance: 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 CO.

Mishap Notification:

Provide protection to Government property to prevent damage during the period of time the property is under the control or in possession of the contractor.

Include a clause in all subcontracts to require subcontractors to comply with the safety provisions of this contract as applicable, including subcontractor cooperation and assistance in accident reporting and investigations.

Record and report promptly (within one hour) to the Contracting Officer (CO) or designated Government representative, all available facts relating to each instance of damage to Government property or injury to either contractor or Government personnel.

In the event of an accident/mishap, take reasonable and prudent action to establish control of the accident/mishap scene, prevent further damage to persons or property, and preserve evidence until released by the accident/mishap investigative authority through the contracting officer.

Cooperate fully and assist Government personnel should the Government elect to conduct an investigation of an accident/mishap. This cooperation will last until the conclusion of the investigation.

APPENDICES

Appendix A – Acronyms and Abbreviations

APPENDIX B - REFERENCES

AMS-M-3171, Processes for Pretreatment and Prevention of Corrosion on Magnesium Alloy

MIL-I-17563C, Impregnates for Cast or Powder Metal Components

T.O. 4B-1-32, Maintenance and Overhaul Instructions for all type Aircraft Brakes image1.jpeg