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TABLE OF CONTENTS

SECTION TITLE PAGE

1.0 SCOPE 3 2.0 FINISH 3 2.1 Dry Film Lubricant (DFL) 3 2.2 Passivated Steel 4 2.3 Anodized Aluminum 4 2.4 Colored Anodized Aluminum 5 2.5 Painted Surfaces 5 2.6 Surface Texture 7 2.7 Scratches, Blemishes and Surface Flaws 8 3.0 RIVETS 9 3.1 Semi-Tubular Rivets 9 3.2 Solid Rivets 10 4.0 PINS 12 4.1 Installation Surface Marring 12 5.0 FIT 13 5.1 Endcap Gap Variation 13 6.0 LABELS 13 6.1 Label Appearance 13 7.0 MARKINGS 15 7.1 MIL-STD-130 Part Marking 15 7.2 Inspection Stamps 16

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1.0 SCOPE This Reference Specification will define acceptable workmanship standards for MNAI mechanical products. The allowances specified herein will not affect fit, form, or function; nor do they negatively impact product life. This document will identify variations in finish which occur during the normal course of manufacture, and is intended to document said variation prior to the initiation of product shipment. This is important so both the manufacturer as well as the customer have clarity as to the workmanship standards, and in particular, the products finish and appearance standards. In summary, the purpose of this document is to eliminate work, cost and risk for both companies on future production orders due to differences in perception as to acceptability of product finish and appearances.

2.0 FINISH

The following sections identify the variations that can be witnessed on finish, and the allowable, acceptable limits. 2.1 Dry Film Lubricant (DFL)

2.1.1 Burnishing: This is only polishing of the DFL, which is to be expected and is acceptable. DFL is a sacrificial coating. However, anodize or bare metal should not be visible upon shipment of parts. Peeling and/or Flaking of the DFL are not acceptable conditions. The below photographs identify characteristics of a burnished HOR, and the burnished patterns are acceptable.

Examples of Dry Film Lubricant (DFL) burnishing

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Additional Examples of Dry Film Lubricant (DFL) burnishing

2.1.2 DFL Color Variation between parts: This is considered normal and is not cause for

rejection. The variation will be shades of gray; appearing throughout the tube length.

2.2 Passivated Steel

Appearance Variations: This is considered normal and is not cause for rejection. Allowable by typical specifications (such as AMS2700), finishes can vary between dull gray to shiny.

2.3 Anodized Aluminum

2.3.1 Color Variations: These are to be considered normal and are not by themselves a cause for rejection. The example below illustrates the degree of color variation which may be possible.

2.3.2 Sheen Variations: The below photograph is illustrative of potential sheen

variation. This is considered normal and is not cause for rejection.

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2.3.3 Anodize Contact Marks: Contact points are acceptable per MIL-A-8625. The size

and /or number will be greater on parts having greater surface area.

2.3.4 Alodine Touch-up: Per common specifications, such as MIL-A-8625, touch-up is acceptable, and is not cause for rejection. Any touch-up is only allowable in areas not subjected to abrasion, and the touch-up areas cannot exceed 5% of the total anodized area.

2.4 Colored Anodized Aluminum 2.4.1 Color and Sheen Variation: Like non-colored anodized aluminum, colored

anodized aluminum color and sheen will also show variation.

2.5 Painted Surfaces 2.5.1 Area Painted: Manufacturing variations such as those shown below are considered

normal. The photographs below show a yellow paint band, although many hold open rods may have varying colors. However, similar application variations may occur.

2.5.2 Surface Finish Variations:

Finish variations such as paint brush marks are acceptable.

2.5.3 Appearance Differences Between Rods: This is considered normal and is not cause for rejection.

Note: Many rods may use a high temperature paint or other required paint material, which will not have the same appearance (different sheen and slight color difference) as the paint used in the examples shown here. The picture below illustrates sheen and color variation between common high and low temperature paints.

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2.5.4 DFL Transferred to Paint Band Surface: A light amount of DFL on the painted bands is acceptable. An example of DFL transfer is illustrated below.

2.5.5 Small Paint Chips: Minor chipping is allowable. A chipped paint area cannot exceed half the width of the groove on red or white painted grooves. For the yellow painted couplex release sleeve, paint chips cannot exceed .100 inches in diameter. Also no more than 1 large chip is allowable and no more than 3 total.

2.5.6 Slight Overspray: This is uncommon but is not a cause for rejection. Below is an picture of acceptable overspray.

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The following describes paint overspray that is unacceptable. When the overspray appearance reduces the effectiveness of the red band or the additional paint thickness affects Hold open rod functionality, the overspray is considered unacceptable.

2.6 Surface Texture

2.6.1 Finish Variations: These will occur and are not cause for rejection.

In the photograph below, differences in surface finish can be seen, but both finishes are within print tolerance and do not negatively affect functionality or life of the part.

2.6.2 Machining Marks: This may sometimes occur and is not cause for rejection,

provided however, that the maximum surface finish requirement is not exceeded, as described below.

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The following photograph shows machining marks that may occur, but still meets the surface finish requirements of the component print. The surfaces of the outer tubes have allowances for surface finish up to 125µin.

2.7 Scratches, Blemishes and Surface Flaws 2.7.1 Minor Surface Variations: As depicted in the following photographs finish

variations can occur and are not cause for rejection.

Light finish variations will occur that are only cosmetic in nature and do not clean up with standard cleaning methods. These variations are in appearance only.

2.7.2 Other Surface Variations: As depicted in the following photographs, these finish

variations are considered not minor, and as such would not be acceptable.

2.7.3 Zinc Chromate: Appearance of this yellow material does not affect fit, form or function.

Where zinc chromate is applied occasional excess usage may be evident. This occasional excess is acceptable.

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2.7.4 Surface Marks: Superficial surface marks are not cause for rejection. Marks will be checked for conductivity; if no conductivity is found, parts are considered acceptable.

3.0 RIVETS 3.1 Tubular Rivet Finishing (used on Couplex release collar)

3.1.1 Finish Variations: These occur and are not cause for rejection.

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Occasionally rivet finish variations will occur, although the function of the rivet is unaffected. The variations are the direct result of the mechanical interface of the rivet with the rivet machines.

3.1.2 Rivet Play: This condition is acceptable.

This semi-tubular rivet application is designed to have a little gap under the rivet head. The gap allowable is .040 from the closest part of the head.

3.1.3 Rivet Head Cracking: Cracked heads are allowed as long as the cracks are radial in

appearance per the following illustration:

3.1.4 Rivet Head Forming: Acceptable head forming of semi-tubular rivets is shown in

the following illustration.

3.2 Solid Rivets Finishing: (used on the tube) Misshapen heads are acceptable and are not cause for rejection.

3.2.1 Acceptable out-of-round driven heads

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3.2.2 Unacceptable deformed driven heads: The following three illustrations document unacceptable rivet head formation.

3.2.3 Limiting dimensions for driven rivet head cracks

3.2.4 Acceptability of cracks in driven head: The following are additional illustrations, descriptions, and analysis of acceptability.

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4.0 PINS

4.1 Dowel Pin Installation Surface Marring: Slight marring of the surface may occur during dowel pin installation. This by itself is not cause for rejection.

During installation of dowel pins an impact device is used. Such marring as shown below will not affect functionality or life of the product. Allowance for both alodining the surface (aluminum components) and touch-up is acceptable. Evidence of dowel pin installation surface marring is shown below.

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5.0 FIT

5.1 Endcap Gap Variation: Many endcaps are predrilled for accuracy and will not be a flush tight fit. Gaps are allowable and do not affect reliability or function.

6.0 LABELS

6.1 Label Appearance

6.1.1 Label Gap or Overlap: Overlap or gaps are allowable and are not cause for rejection. A large gap label-end illustration is shown below:

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An overlap label-end is illustrated below:

6.1.2 Label Flat Spot or Dimple: As shown below this dimple will occur and is not cause for rejection. The dimple appearance is the direct result of a functional hole below its surface.

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6.1.3 Adhesive Residue: This is not uncommon and is not cause for rejection. MNAI generally cleans off adhesive residue. Occasionally, an assembly with this appearance may not get fully cleaned.

7.0 PART MARKING 7.1 MIL-STD-130 Surface Marking Method Changes. Use of different marking methods is

not cause for rejection.

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Typically MNAI uses an ink style marking with a protectant sealing overcoat. However, occasionally MNAI will use different marking technologies that comply with MIL-STD-130 to improve marking life and legibility.

7.2 Inspection stamps. Use of excessive ink is not cause for rejection.

These are occasionally applied with excess ink or the presence of high humidity may affect/delay ink curing, resulting in a like appearance. The inspection number is key, and must be legible. Below is an inspection stamp showing excessive ink.

Inspection Number