HARTZELL PROPELLER INC. SERVICE BULLETIN

Transcription

1 1. Planning Information A. Effectivity Hartzell propeller models HC-B(3,4,5)( )(P,N)-( )( ) that were installed on an aircraft, or that have had B-3339 mounting bolts replaced, between January 30, 2001 and December 31, 2002 are affected. All B-3339 propeller mounting bolts are to be inspected for MSA manufacturing lot number 003, in accordance with this Service Bulletin, before installation. B. Concurrent Requirements None C. Reason (1) An occurrence of a failed B-3339 propeller mounting bolt was encountered when 55 Ft-Lb torque was applied to the bolt during a propeller installation. The broken bolt was identified with the marking "MSA" and was from manufacturing lot number 003. Metallurgical analysis of the failed bolt revealed the presence of intergranular corrosion in a pre-existing crack, indicating a manufacturing defect in the bolt. (2) Other B-3339 propeller mounting bolts from MSA manufacturing lot number 003 were subsequently inspected and tested for hardness characteristics. The test results revealed that the hardness of some of the bolts in manufacturing lot number 003 exceeded specification requirements, indicating that those bolts could be more brittle than other lot number bolts. D. Description (1) This Bulletin provides instructions for a one time on-wing inspection to identify the manufacturer and manufacturing lot number of each B-3339 propeller mounting bolt. (2) This Bulletin mandates replacement of all B-3339 propeller mounting bolts that are from MSA manufacturing lot number 003, and provides a procedure for on-wing replacement of the bolts. (3) This Bulletin mandates the replacement of all existing inventory of B-3339 propeller mounting bolts from MSA manufacturing lot number 003. Page 1 of 5

2 E. Compliance (1) Compliance with the one time on-wing inspection specified in this Bulletin is at next scheduled maintenance activity, not to exceed 100 flight hours or 12 calendar months (whichever occurs first) from the effective date of this Bulletin. (2) All B-3339 propeller mounting bolts are to be inspected for MSA manufacturing lot number 003, in accordance with this Service Bulletin, before installation. F. Approval FAA approval has been obtained on technical data in this publication that affects type design. G. Manpower Approximately 1.0 man-hour per propeller assembly is required to perform the inspection and subsequent propeller mounting bolt replacement, if applicable. H. Weight and Balance Not changed I. Electrical Load Data Not changed J. References Hartzell Propeller Owner's Manual 139 ( ) Hartzell Propeller Owner's Manual 146 ( ) Hartzell Propeller Owner's Manual 167 ( ) K. Other Publications Affected Hartzell Steel Hub Turbine Propeller Maintenance Manual 118 ( ) Hartzell Steel Hub Turbine Propeller Maintenance Manual 132 ( ) Hartzell Propeller Owner's Manual 139 ( ) Hartzell Propeller Owner's Manual 146 ( ) Hartzell Propeller Owner's Manual 167 ( ) Page 2 of 5

3 2. Material Information A. Material required (if replacement of the mounting bolts is necessary) Part Number Key Word Qty. B-3339 Bolt A/R NOTE 1: NOTE 2: Only bolts identified as MSA manufacturing lot number 003 are required to be replaced. Refer to Figure 1. A bolt that does not have any distinguishable identification markings is not a Hartzell part; therefore, Hartzell Propeller Inc. cannot speak to the quality or the material characteristics of this hardware. 3. Accomplishment Instructions A. Visual Inspection (1) Gain access to the B-3339 propeller mounting bolts. (2) Visually inspect each B-3339 propeller mounting bolt for a broken or missing head. If a broken or missing bolt head is discovered, contact the Product Support Department at Hartzell Propeller before further flight. (3) Visually inspect the head of each B-3339 propeller mounting bolt for identification marks. Refer to Figure 1 for the location of the identification mark. APS0818E Part Number M S A Source Code Manufacturing Lot Number Figure 1 Bolt Head Identification Page 3 of 5

4 (4) If there are identification marks "MSA" and "003" on the head of any of the mounting bolts, or if the bolt heads cannot be easily accessed to allow visual inspection, perform the following procedure: a Cut and remove the safety wire that secures each propeller mounting bolt. CAUTION: b LOOSEN ALL PROPELLER MOUNTING BOLTS TO ENSURE PROPER PRELOADING OF THE MOUNTING BOLTS WHEN THEY ARE RETORQUED. Loosen each mounting bolt. WARNING: CAUTION 1: DO NOT REMOVE ALL PROPELLER MOUNTING BOLTS AT THE SAME TIME WITHOUT PROPERLY SUPPORTING THE PROPELLER. SERIOUS INJURY OR DAMAGE TO THE PROPELLER COULD RESULT. REMOVE ALL PROPELLER MOUNTING BOLTS THAT HAVE IDENTIFICATION MARKS "MSA" AND "003" ON THE HEAD OF THE BOLT. CAUTION 2: c DO NOT USE EXISTING INVENTORY OF B-3339 PROPELLER MOUNTING BOLTS FROM MSA MANUFACTURING LOT NUMBER 003. Remove one mounting bolt at a time and closely inspect each bolt identification. Replace all propeller mounting bolts that have identification marks "MSA" and "003" on the head of the bolt. Refer to Figure 1. NOTE 1: Some manufacturing lot numbers may be up to six digits long. Bolts with identification marks other than "MSA" and "003" are not affected. d NOTE 2: Affected bolts must be returned to Hartzell Propeller for replacement at no charge. Refer to the Appendix section of this Bulletin for instructions. Re-torque all of the propeller mounting bolts in proper sequence, in accordance with the Installation and Removal chapter of the applicable Hartzell Propeller Owner's Manual. e Safety the mounting bolts with inch (0.81 mm) minimum diameter stainless steel wire (two bolts per safety). (5) Indicate compliance with this Service Bulletin in the propeller logbook. Page 4 of 5

5 B. Replacement of existing inventory (1) Replace all existing inventory of B-3339 propeller mounting bolts from MSA manufacturing lot number 003. (2) Refer to the Special Replacement Program section in the Appendix of this Bulletin for information about replacement of affected mounting bolts. Page 5 of 5

6 1. Pricing Information Part Number Keyword 2002 List Price B-3339 Mounting Bolt $20.35 NOTE: List price is provided as information only. Refer to paragraph 4., Special Replacement Program, in this appendix, for instructions regarding replacement bolts. 2. Availability/Lead Time A sufficient quantity of replacement bolts is available to allow replacement of all affected bolts. 3. Price Validity Refer to paragraph 4, Special Replacement Program 4. Special Replacement Program A. Propeller mounting bolts B-3339, as identified in paragraph 3.A.(4) Accomplishment Instructions of this Service Bulletin, will be replaced at no charge. B. All existing inventory of B-3339 propeller mounting bolts identified as MSA manufacturing lot number 003 will be replaced at no charge. C. Hartzell will provide replacement mounting bolts for B-3339 mounting bolts as described in paragraphs 4. A. and 4.B. under the following terms: (1) Replacement of an affected mounting bolt may be accomplished as follows: (a) In case subsequent returns are necessary, make copies of the Service Bulletin Compliance form before completing it. (b) Complete the Service Bulletin Compliance form (one form per shipment). (c) Return the completed Service Bulletin Compliance form, along with the affected propeller mounting bolts to the address specified on the form. (d) Upon receipt of the completed form and affected mounting bolts, replacement bolts will be shipped to the address supplied. Propeller Model: HC-B(3,4,5)( )(P,N)-( )( ) Document No. C-SB Rev. No. N/A Component Part Number: B-3339 Date of Issue: Feb 8/02 Rev. Date: N/A HC-SBA Page 1 of 2

7 Service Bulletin Compliance Form Please complete this compliance/claim form for each shipment of B-3339 mounting bolts from MSA manufacturing lot number 003, as identified in this Service Bulletin. Return the completed Service Bulletin Compliance form, along with the affected propeller mounting bolts to: Hartzell Propeller Inc. Attn.: Warranty Administrator One Propeller Place Piqua, Ohio USA Phone: B-3339 Mounting Bolt - MSA Mfg. Lot Number 003: Quantity of bolts returned in this shipment: Company: ATTN: Address: City State: Zip: Country: Phone: Fax: Authorized Signature Date: Propeller Model: HC-B(3,4,5)( )(P,N)-( )( ) Document No. C-SB Rev. No. N/A Component Part Number: B-3339 Date of Issue: Feb 8/02 Rev. Date: N/A HC-SBA Page 2 of 2