SERVICE BULLETIN NO. 528D

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PIPER Piper Aircraft Corporation Vero Beach, Florida,U.S.A. ~********************************* PIPER CONSIDERS ** OMPLIANCE MANDATORY : *w*******************************~ Date October 19, 1990 S (Service Bulletin No. 528D supersedes and voids Service Bulletin NO. 528C, dated October 11, 1989) This Service Bulletin is divided into TWO (2) PARTS. Check each PART for Purpose, Instructions, and Compliance Time. I SUBJECT: REASON FOR REVISION: MODELS AFFECTED: All aircraft incorporating steel wing lift struts (See note) J-2 Series, Cub J-3, NE-l, L-4 Cub J-4 Series Coupe J-5, J-5C, L-14, AE-1, HE-l, Series Cub Cruiser PA-11 Series, Cub Special PA-12 Series, Super Cruiser PA-14 Series, Family Cruiser PA-15 Vagabond PA-16 Clipper PA-17 Vagabond PA-20 Series, Pacer PA-22 Series, Tri-Pacer/Colt PA-25 Series, Pawnee NOTE: Wing Lift Strut Assembly Inspection/Replacement To revise Compliance Time, Purpose, Instructions, and to announce the availability of new sealed lift struts I SERIAL NUMBERSAFFECTED: ALL 500 through 1975 ALL 4-401 through 4-1649 5-l through 5-1389 11-l through 11-1678 12-1 through 12-4036 14-1 through 14-523 15-1 through 15-388 16-1 through 16-736 17-1 through 17-215 20-l through 20-1121 22-l through 22-9848 25-l through 25-8156024 All variations of the PA-18 Series and PA-19 Series are no longer Affected by this Service Bulletin and are covered by Piper Service Bulletin No. 910A (or latest revision). APPROVAL: The technical contents of this Service Bulletin have been approved by the F.A.A. (OVER) ATA: 5701 SERVICE BULLETIN NO. 528D PAGE 2 OF 6 PART I PURPOSE: The five (5) year repetitive inspection interval, required by compliance with Service Bulletin No. 528C may not be adequate for timely detection of serious wing lift strut corrosion. Eventually, undetected corrosion will reduce the strength of the lift strut, and could possibly lead to failure of the strut. In Service Bulletin No. 528C, the compliance time for the existing corrosion inspection and treatment procedure was reduced, and is currently at intervals not to exceed twelve (12) months from the last inspect ion or the first use of a new lift strut. PART I of this Service Bulletin provides an inspection and treatment procedure to detect and treat the corrosion which may be present in the wing lift strut assemblies. COMPLIANCE TIME: thereafter. Before next flight and each twelve (12) month period NOTE If the inspection requirements of Service Bulletin No. 910A or 528C have been accomplished within the last twelve (12) months or if the wing lift struts are new, and have been installed within the last twelve (12) months, the repetitive inspection will be required no later than twelve (12) months after the last inspection or new lift strut installation as the case may be. Upon reaching (24) months from the effective date of this Service Bulletin, proceed to PART II. Compliance with PART II of this Service Bulletin will relieve the repetitive inspection requirements I of PART I. INSTRUCTIONS: 1. Prepare the aircraft for the removal of old wing lift struts by supporting the wing as necessary. I 2. Remove wing lift struts and accomplish the inspection per “Inspection Procedure" on Sketch "A". All aircraft utilizing "cuffs" at the wing lift strut roots (top I CAUTION: l and/o bottom) should take extra care in inspection for external corrosion in the areas covered by the cuffs. 3. Inspect forks, clamps, hardware, fairleads and jury struts for condition and replace as necessary. 4. Turn each wing lift strut upside down and tap gently. This procedure is necessary to remove any water, debris or corrosion particles. 5. Inspect lift struts according to “Inspection Procedure" in Sketch "A". Lift struts indicating presence of internal corrosion or which fail the "Inspection Procedure" must be replaced with new sealed wing lift struts. Should corrosion be apparent from the outside (rust pin holes or large rust stained areas), strut must be replaced even if strut passes the “Inspection Procedure". NOTE The new sealed lift struts may be installed one at a time during the (24) months compliance time (PART II) provided the repetitive . inspection requirements above are met for the lift struts that have not been replaced. Replacement of all lift struts with the new sealed lift struts will relieve the repetitive inspection requirements of PART I of this Service Bulletin. SERVICE BULLETIN NO. 528D PAGE 3 OF 6 INSTRUCTIONS (CONT'D): 6. Treat (corrosion impediment) each wing lift strut per the "Inspection Procedure" note on Sketch "A". Treatment (corrosion impediment) must coincide with each inspection as required by the compliance time above. 7. Upon completion of the “Inspection Procedure" and treatment, reinstall serviceable lift struts on the aircraft. 8. Check aircraft rigging and adjust as necessary. (Use appropriate Piper Service Memo and Owner Handbook as required to accomplish proper rigging.) 9. Make a logbook entry of compliance with PART I of this Service Bulletin. MATERIAL REQUIRED: Not applicable PURPOSE: Piper has developed an improved wing lift strut which will elimi nate the concern for internal corrosion in wing lift struts. The new struts also feature an improvement in the design of the lift strut fork which eliminates the requirements of Piper Service Bulletin No. 1570. PART II It will be necessary to replace existing wing lift struts with new sealed wing lift struts at a date not to exceed (24) months from the effective date of this Service Bulletin. COMPLIANCE TIME: Upon reaching (24) months from the effective date of this Service Bulletin or as required by PART I inspection. 1. 2. 3. 4. 5. 6. 7. INSTRUCTIONS: Prepare the aircraft for the removal of wing lift struts by supporting the wing as necessary. Remove the old wing lift struts. Inspect clamps, hardware, fairleads and jury struts for condition and replace as necessary. Note that the new Piper sealed lift strut assemblies