Attachment_0013_MEO_B2469_W58RGZ-19-R-0050.pdf

MAINTENANCE ENGINEERING ORDER

(AMCOM Reg. 750-2)

MEO NO.

DATE PAGE 1 of

TITLE Tolerances Unless otherwise noted, dimensions are in inches and tolerances are:

Fractional ………………… ± 1/32 Decimal ………………... ± 0.010 Angular ………………… ± ½°

APPLICABILITY CSI Critical Characteristic Affected?

Impact Statement Attached?

REFERENCES FOR RDECOM USE ONLY

DOCUMENT(S) AFFECTED

PURPOSE OR PROBLEM

PROJECT ENGINEER ENGINEERING REVIEW ENGINEERING RELEASE

MED FORM 5-DEC-09 1401-R-E

B 2469

Aug 3, 2016 5

TAIL ROTOR BLADE ASSEMBLY (70101-11200-044),

(70101-31000-043) - Chemical conversion coating per MIL-DTL-81706, Class 1A or Class 3

Technical

INTERIM USE OF THIS MEO IS AUTHORIZED

UNTIL AFFECTED DOCUMENT IS UPDATED.

MEO CHANGE TYPE

4) Normal - Can be implemented with normal priorityPRIORITY IMPLEMENTATION CATEGORY

UH60 DAA

DMWR 1-1615-287, dated 30 DEC 2011 MEO B1703A, MEC B314505 20 OCT 14, 6 JUL 16

MIL-DTL-81706, TN 163996 02 MAY 06, 15 JUL 16

DOCUMENT CHANGE IS REQUIRED Verification: Hands-On Table-Top None

3-13.1. (Touch Up of Aluminum) Replaced MIL-DTL-81706 Form II (powder) with Form III (premixed ready to use) or Form IV (premixed in applicator), Class 1A or class 3 . Appendix C (Expandable Supplies and Materials List): Replaced item 4 with Alodine 1201 (MIL-DTL-81706 Class 1A Form III) and Alodine 1132 Touch-N-Prep Pen (MIL-DTL81706 Class 1A &3), added item 122 (A-A-58054 Fine Abrasive pad), item 123 Alodine 600 (MIL-DTL-81706 Class 3 Form III) & Alodine 1201 (MIL-DTL-81706 Class 1A Form III), item 124 Aircraft Cleaning Compound (MIL-PRF-85570 Type II). 3-13.2.c.&d.

(Removal of Corrosion on Aluminum Alloys) Improved cleaning procedure to use A-A-58054 fine abrasive cleaning pad and verify surface clean per water break-free test.

GRZELECKI.DAN

IEL.P.125929525

Digitally signed by

GRZELECKI.DANIEL.P.1259295250

DN: c=US, o=U.S. Government, ou=DoD, ou=PKI, ou=USA, cn=GRZELECKI.DANIEL.P.1259295250 Date: 2016.07.28 17:29:59 -05'00'

BEARD.SAMUEL.

LEE.1390444830

Digitally signed by

BEARD.SAMUEL.LEE.1390444830

DN: c=US, o=U.S. Government, ou=DoD, ou=PKI, ou=CONTRACTOR, cn=BEARD.SAMUEL.LEE.1390444830 Date: 2016.07.15 15:14:59 -05'00'

Samuel L. Beard

HORN.REINHOL

D.J.1087783495

Digitally signed by

HORN.REINHOLD.J.1087783495

DN: c=US, o=U.S. Government, ou=DoD, ou=PKI, ou=USA, cn=HORN.REINHOLD.J.1087783495 Date: 2016.08.01 10:26:29 -05'00'

Daniel P. Grzelecki Reinhold J. Horn PUBLICATION CHANGE REQUEST: REQUEST THAT THE FOLLOWING DATA BE INCLUDED IN THE NEXT

CHANGE OR REVISION TO THE PUBLICATION IDENTIFIED ABOVE.

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3-52

3-13.1.

REPLACE 3-13.1. with the following:

"3-13.1. Touch Up of Chemical Conversion Coating of Aluminum and Aluminum Alloy Surfaces and Aluminum Lightning Mesh

WARNING

• Acetone is extremely flammable and toxic to eyes, skin, and respiratory tract. Wear protective gloves and goggles/face shield. Avoid repeated or prolonged contact. Use only in well ventilated areas (or use approved respirator as determined by local safety/industrial hygiene personnel).

Keep away from open flames, sparks, hot surfaces or other sources of ignition.

WARNING

• Cleaning compound, MIL-PRF-85570 Type II, is an eye , skin, and respiratory tract irritant.

•Avoid contact with eyes, skin and clothing. Prolonged contact may cause dermatitis. Avoid breathing vapors. Avoid contact with strong acids or oxidizing agents. Use only in well ventilated areas. Wash hands

Distribution Statement D:- Distribution authorized to Department of Defense and U.S. DoD contractors only to protect critical technology effective as of 26 June 2014. Other requests for this document must be referred to U.S. Army Aviation and Missile Research, Development and Engineering Center, ATTN: RDMR -AEM , Corpus Christi, TX 78419-5211

MED FORM 24 FEB 2016

W58RGZ-17-R-0237

Attachment 0013

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MED FORM 15-DEC-09 1401-R-E

3-52

3-13.1.

3-13.1.a.

3-13.1.b.

thoroughly after use. Launder contaminated clothing before re-use. Keep containers closed when not in use. Store in a cool, dry, well ventilated area.

• Protection: Wear chemical goggles, rubber gloves, face shield, and protective clothing; half-mask respirator with organic vapor cartridge required in poorly ventilate areas.

• If eye contact occurs, flush immediately with large amounts of water for 15 minutes and seek medical attention, If skin contact occurs, wash with soap and water, remove contaminated clothing and shoes. If inhalation occurs, move from area to fresh air.

a. Clean surface to be treated by scrubbing with MIL-PRF-85570, Type II cleaner (App. C, item 124) using a fine or very fine abrasive pad (A-A-58054, App. C, item 122). Rinse with clean distilled or deionized water. For water sensitive areas, clean surface with acetone (App C, item 1) using a fine or very fine abrasive pad (A-A-58054, App. C, item 122).

b. Using clean distilled or deionized water, check for a water break-free condition. A surface showing water breaks (water beading or incomplete wetting) is indicative of contamination, which will interfere with conversion coating. Repeat scrubbing cleaning process as needed to achieve a water break-free condition.

CAUTION

• Chemical Conversion Coating (MIL-DTL-81706) is a strong oxidizing agent that may ignite combustible material such as sawdust, rages, and paper or organic substances. Keep container closed; keep sparks, flames and heat away. Keep chemical conversion coating off skin, eyes, and clothes. May severely burn the eyes and skin on contact. Do not breathe vapors. Breathing dusts or mists may irritate the respiratory tract. Long term overexposure by breathing mists or absorption through the skin may cause cancer, kidney and liver damage, and ulceration of the nasal septum.

• Protection: goggles/face shield, apron, neoprene or polyvinyl gloves, NIOSH/MSHA approved respirator if mists exceed established exposure limits.

• Do not use chemical conversion coating materials on high-strength steel. Catastrophic failure may occur due to hydrogen embrittlement.

•Do not allow any aluminum chemical conversion coating materials to enter faying surfaces or other areas where the solutions cannot be adequately removed by rinsing as the residue will cause corrosion.

MED FORM 24 FEB 2016

B 2469

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MED FORM 15-DEC-09 1401-R-E

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3-13.1.b.

3-13.1.c.

3-13.1.d.

CAUTION

Do not use steel, lead,, copper, or glass containers for holding/storing chemical conversion coating materials. use only acid-resistant plastic, rubber or stainless steel.

NOTE

MIL-DTL-81706 is chromate prepaint treatment for both bare and clad aluminum surfaces, including touch-up of scratched/damaged anodized aluminum. MIL-DTL-81706 has two types and two classes. Type I materials contain hexavalent chromium and Type II materials do not contain hexavalent chromium.

Class 1A coatings provide maximum protection against corrosion when left unpainted and superior adhesion when paint systems are applied.

Class 3 coatings are intended for use as a corrosion preventative film for electrical and electronic applications where low electrical resistance is required.

c. Immediately following cleaning and verification of a water break free surface condition, apply aluminum conversion coating material to the surface using the ready to us premixed liquid (FORM II) of MIL-DTL-81706 Class 1A or Class3. MIL-DTL-81706 Class 1 A (APP C, item 4) is used for most applications to provide for maximum protection against corrosion. Use of MIL-DTL-81706 Class 1A will meet the maximum 50 milliohm resistance re2qurement between repaired areas and adjacent wire mesh specified in paragraph 3-13.25. "Replace wire Mesh". MIL-DTL-81706 Class 3 (APP C, item 123) is to be used for protection against corrosion in applications where lower electrical resistance is required.

(1) Do not dry surface prior to applying ready to use Form III of MIL-DTL-81706 conversion coating.

(2) Apply treatment material to surface with a nonmetallic brush (App C, item 70), or low-lint cleaning cloth (App C, item 47). Keep surface wet with treatment material until a color change is noticeable (approximately 2 to 4 minutes). Depending upon the aluminum alloy, the color change will vary from iridescent yellow to golden brown in color.

(3) After color change, rinse treated surfaces with clean, cool distilled or deionized water.

(4) Allow treated surface to completely dry prior to painting, local heating up to too 140 F° (60° C) maximum may be used to accelerate drying.

NOTE

Alodine 1132 Touch-N-Prep (TNP) pens must be used within the expiration date noted on the individual pens. Shelf life for pens stored at room temperature is two (2) years from the date of manufacture. Pens can be used for a maximum of one (1) year after first use. Cap must be kept on pen when not in use to prevent evaporation.

d. MIL-DTL-81706 Form VI, Method D may also be used for touch up conversion coating in application requiring Class 1A or Class 3 conversion coating, using the Touch-N-Prep (TNP) Pen (App C, item 4 & item 123) pet TM 1-1500-344-23-2, Section 5-4.

(1) Surface must be water break free and dry prior to using the TNP pen.

(2) Use of TNP pens does not require water rinsing or wiping-off

MED FORM 24 FEB 2016

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MED FORM 15-DEC-09 1401-R-E

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C-1

3-13.1.d.

3-13.2.c.

3-13.2.d.

following application thereby minimizing hazardous waste generation.

Empty pens can be returned to the manufacturer for recycling using the self -addressed adhesive label and the original box.

REPLACE second sentence beginning with "On heavy corrosion . . ."

with the following:

"To remove the oxide layer or residual chemical conversion coating on bare or clad surfaces, scrub using a fine or very fine abrasive pad (A-A-58054, App. C, item 122), a nonmetallic or aluminum bristle brush (MIL-B-43871, App. C, item 70), aluminum wool (App. C, item 7) or aluminum oxide abrasive cloth (App. C, item 41)."

REPLACE first sentence with the following:

"Remove compound from part using a sponge while rinsing with clean distilled or deionized water."

REPLACE "ITEM NUMBER 5" in "SECTION II. Expandable Supplies and Materials List" with the following:

ITEM NATIONAL STOCK DESCRIPTION U/M

NUMBER NUMBER

5 8030-00-142-9272 MIL-DTL-81706 Class 1A PT and other Units Form III - ready to use premixed of Measure Liquid (Alodine 1201 (71410) or equivalent)

8030-01-460-0246 Alodine 1132 Touch-N-Prep Pen BX MIL-DTL-81706 Class 1A and 3, Form VI, Method D - ready to use premixed in a self-contained applicator device (71410)

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MED FORM 15-DEC-09 1401-R-E

C-7

ADD the following Items to "Table C-1. Expandable Supplies and Materials List Continued":

ITEM NATIONAL STOCK DESCRIPTION U/M

NUMBER NUMBER

122 7920-00-045-2940 A-A-58054 Fine Abrasive Pad BX

123 8030-00-057-2354 MIL-DTL-81706 Class 3 PT and other Units Form III - ready to use premixed of Measure liquid, (Alodine 600 (71410) or equivalent)

8030-01-460-0246 Alodine 1132 Touch-N-Prep Pen BX MIL-DTL-81706 Class 1A and 3, Form VI, Method D - ready to use premixed in a self-contained applicator device (71410)

124 6850-01-581-9413 MIL-PRF-85570, Type II QT and other Units Aircraft Cleaning Compound of Measure