PROPELLER_REPAIR_SPECIFICATION.doc

REVISION No. G

CHANGE No. .

REVISION DATE__12/31/2013

TITLE

PROPELLER REPAIR SPECIFICATION

FOR 140 FT WTGB ICEBREAKING

VESSELS

R-245-0088

ORIGINATED BY LT L. AMES DATE __03/91 .

UPDATED BY A.G. OLLERMAN DATE 12/13 .

ORIGINATOR’S COMMAND ENGINEERING LOGISTICS CENTER (ELC)

DEPARTMENT / DIVISION EQUIPMENT MANAGEMENT DIVISION (CODE 026).

INTERNAL REVIEWER DATE .

SOWRB APPROVAL DATE

PROPELLER REPAIR SPECIFICATION

FOR 140 FT WTGB ICEBREAKING

VESSELS

1.0 SCOPE

1.1. This document sets forth the requirements for the receipt, storage, inspection, repair, testing, preservation, packaging, packing and marking of bronze propellers used on 140 FT. WTGB ICEBREAKING VESSELS.

1.2. CLASSIFICATION

1.2.1. Types

a. Type 1, - Right Hand (RH), P/N 101WYTM-245-001

1.3. GOVERNMENT FURNISHED PROPERTY (GFP) - The listed items are property of and managed by the USCG Surface Forces Logistics Center, Baltimore MD.

1.3.1. Propeller(s), Type 1, NSN 2010-01-078-8216, Right Hand, 102in Diameter

2.0 APPLICABLE DOCUMENTS

2.1. GENERAL – The documents listed in this section are specified in sections 3, 4, or 5 of this specification. This section does not include documents cited in other sections of this specification recommended 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 cited in Sections 3, 4, or 5 of this specification, whether or not they are listed.

2.2. GOVERNMENT DOCUMENTS

2.2.1. SPECIFICATIONS, STANDARDS, PUBLICATIONS, AND HANDBOOKS – The following specifications, standards, publications, and handbooks form a part of this specification to the extent specified herein. Unless otherwise specified, the versions in effect are those listed in the GSA Index of Federal Specifications, Standards And Commercial Item Descriptions or the current Department of Defense Single Stock Point of Specifications And Standards, (DODSSP), and supplements thereto, cited in the solicitation or contract.

2.2.2. SPECIFICATIONS

a. MIL-DTL-2845E(SH) - DATED 18 AUG 1999, Propulsion Systems, Boat and Ship; Main Shafting, Propellers, Bearings, Gauges, Special Tools, and Associated Repair Parts; Preservation, Packaging, Packing and Storage of

2.2.3. STANDARDS

a. MIL-STD-167-1A(SHIPS) - DATED 2 NOV 2005, Mechanical Vibrations of Shipboard Equipment

b. MIL-STD-2035A(SH) - DATED 15 MAY 1995, Nondestructive Testing Acceptance Criteria

c. DOD-STD-2185(SH) - DATED 28 OCT 1986, Requirements for Repair and Straightening of Bronze Naval Ship Propellers

2.2.4. OTHER GOVERNMENT DOCUMENTS

a. USCG Drawing No. 101WYTM-245-001 REV D, DATED 08/26/14, PROPELLER AND OFFSETS

b. COAST GUARD SPECIFICATION D-000-0100 - DATED 10/91 REV G 02/06, Bar Coding for U.S. Coast Guard Procured Material

c. NAVSEA TECHNICAL MANUAL, NAVSEA S9086-HP-STM-010, DATED 1 August 2009, Technical Manual Marine Propeller Inspection, Repair and Certification, NSN 0910-LP-104-1714

d. T9074-AS-GIB-010/271 - DATED 16 FEB 1999, Requirements for Nondestructive Testing Methods

2.3. COMMERCIAL DOCUMENTS

2.3.1. International Standards Organization

a. ISO 484/1-1981: Shipbuilding-Ship screw propellers-Manufacturing tolerances-Part 1: Propellers of diameter greater than 2.50m

American Bureau of Shipping (ABS)

b. Guide for Bronze and Stainless Steel Propeller Castings - DATED 2007 Society of Automotive Engineers (SAE)

c. SAE-J-448A - DATED June 1963, Surface Texture Standard

d. SAE AMS-T-22085 - DATED 01 June 1999, Tapes, Pressure-Sensitive, Adhesive, Preservation and Sealing–FSC 7510 American National Standards Institute (ANSI)/National Conference of Standards Laboratories (NCSL)

e. ANSI/NCSL Z540-1-1994 - DATED 1994, General Requirements for Calibration Laboratories and Measuring and Test Equipment American Society For Quality Control (ASQC)

f. ANSI/ASQC Q9003-1994 - DATED 1994, Quality Systems - Model for Quality Assurance in Final Inspection and Test

2.4. DOCUMENT AVAILABILITY - To obtain the referenced documents see section 6.1.

2.5. ORDER OF PRECEDENCE - In the event of a conflict between the text of this specification and the references cited herein, the text of this specification takes precedence. Nothing in this document, however, supersedes applicable laws and regulations unless a specific exemption has been obtained.

3.0 REQUIREMENTS

3.1. GENERAL - The Contractor shall provide all labor, equipment and material required to refurbish the GFP propeller(s) to a serviceable condition in accordance with MIL-STD-2185(SH).

Serviceable condition is defined as being capable of functioning and performing in the same manner as an identical new propeller although it may not have the appearance of newness.

3.2. GOVERNMENT FURNISHED PROPERTY (GFP) - The Contractor shall provide protective storage for the GFP listed in section 1.3 of this specification when not in use, and safe handling when in use.

The storage area shall, at a minimum, be closed on all sides, dry, and locked when unattended.

3.3. MATERIAL - Each propeller is constructed of ABS Type 4.

3.4. TEST & INSPECTION DATA REQUIREMENTS, PRE-REPAIR INSPECTION REPORT - Each propeller received by the Contractor shall be inspected upon receipt and a report outlining the required repairs and pricing submitted to the Contracting Officer for approval. The Contractor shall measure and inspect all propeller surfaces and dimensions using electronic measuring equipment, accurate to within .001”, as much as practicable. The Contractor shall demonstrate an inspection process that ensures tolerances for all hydrodynamic surfaces are met. The use of modern marine propeller computer assisted inspection systems such as Prop Scan, Hale Measurement Recording Instrument (MRI), digital laser scanning or an equivalent system shall be utilized. No further work will be authorized until the submitted report is reviewed and approved.

3.4.1. The Pre-repair Inspection Report shall contain, at a minimum, the following data:

a. Shipping container condition (see 5.2 of this specification)

b. Propeller blade radius

c. Pitch at the following sections - (0.5 thru 0.95 radiuses)

d. Average pitch of each blade at the following sections - (0.5 thru 0.95 radiuses)

e. Blade section width at the 0.4 thru 0.95 radiuses

f. Thickness at point of maximum thickness (PMT), at the 0.4 thru 0.95 radiuses

g. Track

h. Fairing rod clearances

i. Surface finish of blade surfaces, fillets, and bore

j. Surface inspections (Visual and 100 percent dye penetrant examination in accordance with section 3.5.1. of this specification)

k. Hub bore visual and dimensional inspections

l. Estimated time required for repairs

m. Estimated total labor and material cost of repairs

n. Photo documentation in accordance with section 3.14. and 3.14.1.a, b., and c. of this specification

o. Remove/inspect and repair as necessary the tallow fill plugs on the propeller hub If at any time while performing the pre-repair inspection or during authorized repairs that the Contractor believes the propeller may be beyond economical repair, the Contracting Officer shall be notified immediately and provided a description of the propeller’s condition to support this assessment.

3.5. SURFACE INSPECTIONS

A visual inspection shall be performed on all exterior surfaces in accordance with MIL-STD-2035 section 4.

a. All visual defects, even though deemed acceptable, shall be documented on the inspection report.

The Contractor shall perform a dye penetrant inspection over 100 percent of the blade surfaces including the fillets and hub in accordance with Section 5 of T9074-AS-GIB-010/271. The acceptance criteria of MIL-STD-2035, Table IV (Appendix 1 of this specification) shall be used for evaluations.

The Contractor shall document all defects resulting from the visual and dye penetrant inspections. All defects or indications shall be indicated by type and size on visual inspection sheets. A separate visual inspection sheet shall be submitted for each of the following: the blade pressure face, the blade suction face, the fillet surfaces, and the hub.

Photo documentation shall be provided in accordance with section 3.14. and 3.14.1.c. of this specification.

3.6. PROPELLER REPAIRS - Repair shall be made utilizing the following methods in declining order of preference:

Straightening

Material removal (grinding)

a. Material removal shall be limited to the minimum required to achieve the repair.

Clad welding

3.7. REPAIR TOLERANCES - Each Propeller shall be repaired within the repair tolerances listed in ISO 484/1 Class I (Appendix 2 of this specification) and USCG Drawing 101WYTM-245-001 REV B, DATED 07-27-93, PROPELLER AND OFFSETS.

3.8. QUALIFICATION OF WELDING PROCEDURES - Welding procedures, welding procedure qualifications, and welder performance qualifications shall be certified in accordance with DOD-STD-2185 or approved in accordance with the American Bureau of Shipping. The welding procedures and qualification documents shall be submitted for approval with the solicitation.

3.8.1. ABS certification to perform weld repairs in Severity Zone A shall be submitted for approval with the solicitation.

Welding on the pressure face critical areas or severity zones shall not be undertaken without prior approval of the Contracting Officer.

a. CRITICAL AREA - The critical area is described as the pressure face of the blade between the fillet and the .4 radius and starting at the leading edge encompassing 80% of the chord length taken at the 0.4 radius. (Reference Figure 1 of DOD-STD-2185)

b. SEVERITY ZONES – The severity zones are described in ABS Guide for Bronze and Stainless Steel Propeller Castings dated 2007, Part 7, Section 10, paragraph 1.5.5(b). (Reference Figures 2 and 3 of 7-A-10)

Welding repairs of the propellers shall meet the requirements of DOD-STD-2185 or the American Bureau of Shipping.

The Contractor shall document all welding performed on the visual inspection sheets for each propeller. Each weld shall be dimensionally identified by location, length, width, and depth.

Photo documentation shall be provided in accordance with section 3.14. and 3.14.1.d. of this specification when applicable.

3.9. SURFACE FINISH - Surfaces of the propeller blades, fillets, and hub shall be ground fair and polished to the finishes outlined below in accordance with SAE-J-448A.

3.9.1. Propeller blade surfaces - 63 micro inches or better

3.9.2. Propeller fillets and hub - 125 micro inches or better All high spots, burrs, abrasions, nicks, corrosion, and foreign matter shall be removed from propeller glands, hub bores, flanges, and mating surfaces.

3.9.3. All exposed threaded areas shall be chased and tapped.

3.10. BALANCING

3.10.1. STATIC (Single Plane)

3.10.1.1 Each propeller shall be single plane balanced as stated herein. All balancing shall be accomplished by means of balancing equipment, which requires rotation of the work piece. The residual unbalance in each plane of correction shall not exceed the value determined by calculating the following formula: U = 4000W/N2 where:

U = Maximum allowable residual unbalance in oz.- inches.

W = Weight of rotating part in pounds.

N = Maximum operating speed of unit. (305 RPM)

Prior to performing any balance tests, the Contractor shall demonstrate the sensitivity of the balance machine using a weight determined from the following formula: Ws = 0.1(U)/r where:

Ws = Sensitivity Weight

U = Propeller residual unbalance tolerance

R = Radial location of the weight

The addition of this weight shall be easily detected and discernible to the balance machine operator.

3.10.1.2 The mandrel or concentric rings used to support the propeller during balancing shall not exceed a total indicated run-out (TIR) of .001 inches.

3.10.1.3 Material removed to effect balancing shall be taken from the suction face of the heavy blade. Care shall be taken to keep a fair surface. The area from which metal is taken shall not come within 10 percent of the chord length to the leading or trailing edges. Coordinate material removal between static and dynamic efforts, if prudent wait for more sensitive dynamic balancing data to be produced before material removal.

3.10.1.4 The actual amount of unbalance for each propeller shall be documented (initial and after any balancing efforts) on each Final Inspection Report.

3.10.2. DYNAMIC (Two Plane)

3.10.2.1 Upon completion of satisfactory static balancing, Contractor shall perform dynamic balancing of the propeller. Vessels have encountered unacceptable levels of vibration attributed to propellers. To improve confidence that balance is optimal, a decision has been made to obtain dynamic balancing. Research has shown modern advancements in computer assisted balancing machines have made dynamic balancing of propellers available.

3.10.2.2 Contractor shall use dynamic balancing equipment, and proprietary software, to (a) validate static balance data (b) obtain a further improved state of balance achievable for the propeller at hand. ISO 1940 G2.5 balance tolerance shall be sought, if not obtained Contractor shall provide specific reasons for failure.

3.10.2.3 The results of dynamic balancing shall be documented including any computer printouts available (initial and after any balancing efforts) on each Final Inspection Report.

3.11. TEST & INSPECTION DATA REQUIREMENTS, FINAL INSPECTION REPORT – After completion of all welding, and repairs, the Contractor shall perform final dimensional, balancing, and visual and dye penetrant surface inspections of each propeller. The Final Inspection Report shall depict the final condition of each propeller after all repair work has been completed.

The Final Inspection Report shall be submitted to the Contracting Officer for review. If this report is determined to be acceptable, the Contracting Officer will authorize SFLC’s Quality Assurance Branch to schedule final inspections/tests outlined in section 4.4. of this specification.

The Final Inspection Report shall contain, at a minimum, the following data:

a. Propeller blade radius

b. Pitch at the following sections (0.5 thru 0.95 radiuses)

c. Average pitch of each blade at the following sections (0.5 thru 0.95 radiuses)

d. Blade section width at the 0.4 thru 0.95 radiuses

e. Thickness at point of maximum thickness (PMT), at the 0.4 thru 0.95 radiuses

f. Track

g. Fairing rod clearances

h. Surface finish of blade surfaces, fillets, hub, and bore

i. Surface inspections (Visual and 100 percent dye penetrant examination in accordance with section 3.5. of this specification)

j. Hub bore visual inspection and final dimensions

k. Balancing data as determined in section 3.10 of this specification

l. Visual inspection data for all weld repairs in accordance with section 3.8.5 of this specification

m. Photo documentation in accordance with section 3.14. and 3.14.1.e. of this specification

Areas of the propeller where dimensions were taken and recorded on the pre-repair inspection report, but were not affected by follow-on repair work, do not have to be re-inspected. However, the Final Dimensional Inspection Report shall include all applicable pre-repair and post repair data.

3.12. STAMPING - Each propeller shall be stamped with the listed information, or the presently stamped information shall be changed if incorrect.

The stampings shall be at least 1/4” high legible printing, or the same height of the existing stamping if only corrected.

The stamping shall include, at a minimum, the following information:

a. Company Name

b. Date of Repair Completion

c. Serial Number (supplied by the Contracting Officer if none exists)

d. Direction of Rotation (LH or RH)

e. Type of Material.

f. Weight

3.13. NOTIFICATIONS & INSPECTIONS - The Contractor shall be responsible for notifying the Contracting Officer at least ten (10) calendar days prior to inspections or monitored testing required herein.

3.14. PHOTO DOCUMENTATION – The Contractor shall provide Photo Documentation to the Contracting Officer as part of the Pre-repair Inspection Report, during in-process welding repairs (if applicable), after final inspection, and during preservation, packaging, and packing. Each photograph shall include the propeller serial number and date the photograph was taken. The color photographs shall be taken with a digital camera and the images provided electronically in “jpg format” to the Contracting Officer during the overhaul phases outlined below.

3.14.1. PHOTO DOCUMENTATION PHASES:

a. During initial receipt of the propeller with photographs showing the suction face, pressure face, hub markings and two photographs of the shipping crate taken at 90 degrees apart.

b. Prior to the repair of the propeller with close-up views showing any damage, erosion, corrosion that will affect cost or repair cycle time.

c. During the pre-repair dye penetrant inspection showing any porosity or cracks.

d. During repair of the propeller whenever significant cropping or welding is required.

e. After final inspection prior to preservation showing surface texture/finish of the suction face, pressure face, fillet and hub. Stamped markings shall also be photographed.

f. Prior to inserting the propeller in the shipping container, showing strippable compound application and sheet metal blade edge protectors installed.

g. Prior to shipment, showing container markings.

3.14.2. In addition to providing electronic photographs at the various overhaul phases indicated, the Contractor shall provide a final Compact Disc (CD) to the Contracting Officer that includes all of the pictures referenced in 3.14.1. The pictures on this CD shall be organized in “jpg format” within folders labeled as follows: Receiving Inspection (photos referenced in 3.14.1.a.); Pre-repair Inspection (photos referenced in 3.14.1.b. and c.); In Process Repair (photos referenced in 3.14.1.d; Post Final Inspection (photos referenced in 3.14.1.e.; and Preservation, Packaging, and Markings (photos referenced in 3.14.1.f. and g.).

4.0 QUALITY ASSURANCE (Q.A.)

4.1. GENERAL - The Contractor shall provide and maintain an inspection system which shall ensure each item offered to the Government for acceptance conforms with contract requirements. The system shall be documented and meet the requirements of ANSI/ASQC-Q9003-1994.

4.2. RESPONSIBILITY FOR INSPECTION - The Contractor is responsible for the performance of all inspection requirements as specified herein. The Contractor may use his own or any other facility for the performance of the inspections and tests, unless disapproved by the Government. The Government reserves the right to perform or witness any of the inspections and tests set forth in this specification at any time.

4.3. RESPONSIBILITY FOR COMPLIANCE - All items shall meet the provisions of Sections 3 & 5. The inspections set forth in this specification shall become part of the Contractor’s overall inspection system or quality program. The absence of any inspection requirement in the specification shall not relieve the Contractor of the responsibility of assuring that all products or supplies submitted to the Government for acceptance comply with all requirements of the contract. Sampling for quality conformance does not authorize submission of known defective material (either indicated or actual) nor does it commit the Government to acceptance of defective material.

4.4. INSPECTIONS/TESTS - The inspections and tests required herein are the minimum necessary and are not intended to replace any controls, examinations or tests normally employed by the Contractor to assure the quality of the product. The following are required and shall be monitored by a Government Quality Assurance Representative.

Dimensional inspection in accordance with sections 3.7 and 3.11.2.a, b, c, d, e, f, g, h, and j of this specification.

Surface inspections in accordance with section 3.11.2.i.of this specification. Surface inspections shall be performed upon arrival of the Government Quality Assurance Representative prior to any other inspections/tests required herein.

Balancing inspection in accordance with section 3.10 of this specification.

Stamping inspection in accordance with section 3.12 of this specification.

4.5. TEST AND INSPECTION REPORTS - One copy of any required inspection, test or tolerance check report shall be sent to the Contracting Officer.

A copy of any test, inspection or tolerance check report shall also be turned over to the Coast Guard Quality Assurance Representative upon arrival at the Contractor’s facility.

4.5.1. All out of tolerance readings on any inspection, test or tolerance check report submitted to any Coast Guard representative shall be easily identified through highlighting, color coding, shading, circling or other prominent marking.

4.6. CALIBRATION SYSTEM - The Contractor as well as any subcontractors shall be required to maintain a test equipment calibration program in compliance with ANSI/NCSL Z540-1-1994. The program shall be documented and traceable to the National Institute of Standards (NIST).

The calibration system records shall be maintained for inspection for the duration of any contract referencing this specification.

4.7. PACKING INSPECTION - The Contracting Officer shall be notified prior to the preservation, packaging, packing, and marking of the completed units.

5.0 PRESERVATION, PACKAGING, PACKING, & MARKING

5.1. PRESERVATION & PACKAGING

Prior to preservation, each propeller shall be cleaned by any process or combination of processes, which will accomplish thorough cleaning without damage to the propeller.

a. After cleaning, tape conforming to SAE AMS-T-22085 and strippable compound preservative shall be applied to each propeller in accordance with MIL-DTL-2845E, paragraph 3.14.1.3.

b. After the application of strippable compound, galvanized sheet metal blade edge protectors, utilizing corrosion resistant hardware, shall be installed in accordance with MIL-DTL-2845E paragraph 3.14.1.4.

c. Photo documentation shall be provided in accordance with section 3.14. and 3.14.f. of this specification.

5.2. PACKING - Each propeller shall be individually packed in accordance with MIL-DTL-2845E paragraph 3.14.2.2.2.

If the original shipping container received by the Contractor is in good material condition and complies with 5.2 of this specification, the container shall be reused.

If a new shipping container is required, the Contractor shall notify the Contracting Officer within fifteen days after receipt of the GFP.

5.3. MARKING - Each packaged, and packed propeller shall be marked in the upper left-hand side of the two longest sides, (two opposite sides if square) of each container. The lettering shall be black painted stencil and permanently affixed to each container. The lettering shall be at least 1” high, and be applied on a highly contrasting painted background.

This marking shall consist of the STOCK NUMBER, ITEM NAME, PART NUMBER, SERIAL NUMBER, CONTRACT NUMBER, SHIPPING WEIGHT (in lbs.,), condition code i.e. CONDITION A, QUANTITY with UNIT OF ISSUE (1) EA, and the words COAST GUARD SFLC MATERIAL.

See below for marking layout.

a. Type 1 - PROPELLER, RIGHT HAND (RH)

STOCK NUMBER: 2010-01-078-8216

ITEM NAME: PROPELLER, RH

PART NUMBER: l01WYTM-245-001 SERIAL NUMBER: As stamped on hub

CONTRACT NUMBER: As indicated on contract

DELIVERY ORDER NUMBER: As indicated on contract

SHIPPING WEIGHT: As Determined by Contractor

CONDITION CODE: CONDITION A

QUANTITY & UNIT OF ISSUE:

1- EA

COAST GUARD SFLC MATERIAL

REUSABLE CONTAINER DO NOT DESTROY

5.3.2. Photo documentation shall be provided in accordance with section 3.14. and 3.14.g. of this specification.

5.4. BAR CODING - Bar code labels shall be supplied on all CLIN’s except for those that require data submissions only.

All bar coded labels shall be in accordance with SFLC specification D-000-0100, REV G, DATED 02/06.

a. The actual labels shall be Type “V”, Grade “A”, Style “2”, Composition “b” with plastic laminate.

b. Each label shall contain encoded data for the Stock Number.

6.0 NOTES

6.1. GOVERNMENT & COMMERCIAL DOCUMENT SOURCES

6.1.1. GOVERNMENT DOCUMENTS

a. Department of Defense Single Stock Point (DODSSP)

Building 4, Section D 700 Robbins Avenue

Philadelphia, PA 19111-5094

215-697-2667/2179

FAX 215-697-1462

b. DOD & Navy Publications and Forms (Other Than DODSSP)

Naval Publication and Forms Center

5801 Tabor Ave.

Philadelphia, PA 19120

215-697-2000

COMMERCIAL DOCUMENTS

c. American Bureau of Shipping (ABS)

ABS Plaza

16855 Northchase Drive

Houston, TX 77060

281-877-6000, FAX 281-877-6001

www.eagle.org

d. Society of Automotive Engineers, Inc. (SAE)

400 Commonwealth Drive

Warrendale, PA 15096

412-776-4841

FAX 412-776-5760

www.sae.org

e. American Society For Quality Control (ASQC)

611 East Wisconsin Avenue

Milwaukee, Wisconsin 53202

414-272-8575, FAX 414-272-1734

f. American National Standards Institute (ANSI)

25 West 42nd Street

(Between 5th and 6th Avenues)4th Floor

New York, NY 10018

212—642-4900

FAX 212-398-0023

www.ansi.org

OTHER GOVERNMENT DOCUMENTS

g. USCG Engineering Logistics Center

MAIL STOP # 026 BLDG 31 2nd FL.

2401 Hawkins Point Road

Baltimore, MD. 21226-5000

Attn:

Code 046

TABLE IV. Acceptance standards for inspection of bronze propellers.9

Location of discontinuities Type of discontinuities2 Maximum acceptable discontinuity size (inches)1'3 Discontinuity acceptance standards Allowable areas of concentration

6 x 6 Area of concentration6.7

Maximum No.8.9 Maximum spacing between aligned discontinuities."

CASTINGS

A band located around the periphery of each blade on both the pressure and suction faces with a width equal to

10 percent of the width of the blade measured at the 0.

radius, but not to exceed

6-inches; and an area mea‑ sured from (and including) the hub fillet to 0.4 radius on the pressure face only.

5 percent of propeller surface area with distribution limited by a maximum of 5 percent for each blade surface.

The remaining surfaces of the blades.

D

whichever is less

WELDMENTS

area.

See footnotes on following page.

APPENDIX 1 (Page 1 of 2)

TABLE IV FOOTNOTES

1. Liquid penetrant inspection shall be performed as an aid to visual inspection in locating discontinuities. Only discontinuity size shall be used as a basis for rejection.

2. A linear discontinuity is one in which the length is greater than or equal to three times the width.

3. Any linear discontinuity over 1/16 inch in length located within a peripheral band 1 inch wide;

and whose major dimension is oriented normal to the blade edge shall be repaired.

4. Maximum spacing is the distance separating two adjacent discontinuities in terms of the major dimension of the larger discontinuity (D). Aligned non-linear discontinuities shall consist of four or more discontinuities in a line. Aligned linear discontinuities shall consist of two or more discontinuities whose major dimensions are oriented in a line. However, when the total length of the aligned discontinuities does not exceed the maximum length permitted for a single discontinuity, these aligned discontinuities shall be considered as one discontinuity, and shall not be cause for rejection.

5. When the major dimension of clustered discontinuities does not exceed the maximum size permitted for a single discontinuity, these clustered discontinuities shall be considered as one discontinuity and shall not be cause for rejection. Scattered discontinuities, separated from the cluster by 1/8 inch or more shall not be considered as part of the cluster..

6. Randomly dispersed casting discontinuities whose major dimensions are 1/16 inch or less shall not be counted in determining total number of discontinuities within an area of concentration.

7. More than six discontinuities whose major dimensions are greater than 3/32 inch in any 6 by 6-inch area of the propeller surface constitute an area of concentration. Each area of concentration shall be separated from an adjacent area of concentration by a minimum of 18 inches.

8. The total number of non-linear discontinuities may be increased to the combined total, or part thereof, represented by the absence of linear discontinuities.

9. For used propellers not originally inspected to the requirements of this standard, the allowable number of discontinuities in each area of concentration may be increased 15 percent for each blade surface, and the minimum spacing between adjacent aligned linear discontinuities may be reduced to 2D provided that: (a) the discontinuities do not exceed the limits of any other requirement of this standard, and (b) the discontinuities have shown no deleterious effects in service.

APPENDIX 1 (Page 2 of 2)

PROPELLER REPAIR TOLERANCES

140 WTGB PROPELLERS

ISO 484/1 CLASS I

REPAIR TOLERANCES

MEAN PITCH OF EACH RADIUS OF EACH BLADE = +/- 1.5% of design with a minimum of 0.394”

DESIGN MAX MIN

0.3R

60.094 60.995 59.193

0.4R

68.937 69.971 67.903

0.5R

72.213 73.296 71.298

0.6R

71.500 72.573 70.428

0.7R

72.947 74.041 71.853

0.8R

75.435 76.567 73.303

0.9R

75.115 76.242 73.988

0.95R

74.836 75.956 73.713

MEAN PITCH PER BLADE = +/- 1.0% of design with a minimum of 0.296”

71.385 72.099 70.671

MEAN PITCH FOR PROPELLER = +/- 0.75% with a minimum of 0.197”

DESIGN

MAX MIN

71.385

71.920 70.850

APPENDIX 2 (Page 1 of 3)

TRACK = +/- 1% of propeller design diameter

Tolerance band = 2.04” max

BLADE THICKNESS = Plus tolerance is +2.5% of PMT with a minimum of .0394”/Negative tolerance is -1.5% of PMT with a minimum of -0.0394”

0.3R 5.039

5.165 4.963

0.4R

4.366 4.475 4.301

0.5R 3.711 3.804 3.655

0.6R 3.082 3.159 3.036

0.7R 2.489 2.551 2.452

0.8R 1.909 1.957 1.870*

0.9R 1.356 1.395* 1.317*

0.95R 1.015 1.054* 0.976*

*Minimum tolerance applies

BLADE WIDTH = +/- 2% of value derived from diameter (102”) divided by number of blades (4) with a minimum of 0.276”

DESIGN HIGH LOW

0.4R 38.621 39.131 38.111

0.5R 40.638 41.148 40.128

0.6R 41.345 41.855 40.835

0.7R 40.540 41.050 40.030

0.8R 37.532 38.042 37.022

0.9R 30.360 30.870 29.850

0.95R 23.915 24.425 23.405

APPENDIX 2 (Page 2 of 3)

NOTE: A minimum of 4 radii must be measured as agreed between USCG/Contractor

ANGULAR SPACING OF BLADE CENTER AXIS = +/- 1 degree

DESIGN

HIGH

LOW

90 91 89

BALANCE TOLERANCE - 390.86 OZ IN

PROPELLER RADIUS - +/- 0.3% OF DESIGN

DESIGN HIGH LOW

51.000 51.510 50.490

FAIRING ROD CLEARANCE - WITHIN 3/32"

BORE LARGE END DIAMETER - 12.3172"

KEYWAY WIDTH - 2.5590"

KEYWAY DEPTH - 0.5512"

APPENDIX 2 (Page 3 of 3)