INCH-POUND
MIL-DTL-5521C
6 JUNE 2007
SUPERSEDING
MIL-W-5521B
13 DECEMBER 1968
DETAIL SPECIFICATION
WASHER, AIRCRAFT HYDRAULIC PACKING BACK-UP
INACTIVE FOR NEW DESIGN AFTER 22 AUGUST 1994
This specification is approved for use by all Departments and Agencies of the Department of Defense.
1. SCOPE
1.1 Scope. This specification establishes the requirements for one type of packing back-up washers for
use in aircraft hydraulic systems.
2. APPLICABLE DOCUMENTS
2.1 General. The documents listed in this section are specified in section 3, 4, or 5 of this standard. This
section does not include documents cited in other sections of this standard or recommend for additional
information or as examples. While every effort has been made to ensure the completeness of this list,
document users are cautioned that they must meet all specified requirements of documents cited in
sections 3, 4, or 5 of this standard, whether or not they are listed.
2.2 Government documents.
2.2.1 Specifications, standards, and handbooks. The following specifications and standards form a part
of this document to the extent specified herein. Unless otherwise specified, the issues of these
documents are those cited in the solicitation or contract.
FEDERAL STANDARDS
FED-STD-311
Leather, Methods of Sampling and Testing
FED-STD-791
Lubricants, Liquid Fuels, and Related Products, Methods of
Testing
Comments, suggestions, or questions on this document should be addressed to Defense Supply Center
Philadelphia (DSCP), ATTN: DSCP-NASA, 700 Robbins Avenue, Philadelphia, PA 19111-5096 or e-mail
to dscpg&inspecomments@dla.mil. Since contact information can change, you may want to verify the
currency of this address information using the ASSIST Online database at https://assist.daps.dla.mil.
AMSC N/A
FSC 5330
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