SERVICE BULLETIN Nº 25-27-09
Piper PA-25 Pawnee · Service Bulletins
Overview
This service bulletin addresses mandatory inspections for the Piper PA-25, PA-25-235, and PA-25-260 aircraft models, focusing on the detection of corrosion and cracks in the forward and aft wing spars. It highlights the importance of routine inspections due to severe corrosion found in these areas. The document outlines the necessary actions to be taken, compliance times, and detailed inspection procedures to ensure the structural integrity of the aircraft. It serves as a critical reference for maintenance personnel and aircraft operators to maintain safety and compliance with airworthiness standards.
- Initial inspection required at 500 hours or 5 years, whichever comes first.
- Repetitive inspections every 100 hours or 12 months.
- Corrosion detected on wing spars must be addressed immediately.
- Use rust inhibitor LPS3 for protection after inspections.
- Contact LAVIASA for repairs if corrosion or cracks are found.
Document
Source
Originally published by laviaargentina.com. Sprinkle hosts a reference copy with an added summary, specifications and searchable full text.
Document details
- Type
- Service Bulletins
- Year
- 2023
- Pages
- 8
- File size
- 744 KB
- Publisher
- laviaargentina.com
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- Pilot's Operating Handbook / AFM
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- Parts Catalog (IPC)
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- Type Certificate (TCDS)
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In this document
Purpose
The purpose of this service bulletin is to detect corrosion and/or cracks on the forward and aft wing spars of the affected Piper PA-25 models.
Applicability
This bulletin applies to all serial numbers of the Piper PA-25, PA-25-235, and PA-25-260 models.
Compliance Time
Initial action must be taken at 500 hours time since new (HS TSN) or within 5 years since new, whichever occurs first. Repetitive actions are required every 100 hours or 12 months, whichever occurs first.
Actions Required
Initial actions include removing inspection covers, inspecting for corrosion and cracks, cleaning areas behind the wingwalk, and applying rust inhibitors if no issues are found. If corrosion or cracks are detected, specific repair actions must be taken, including contacting LAVIASA for further instructions.
Inspection Holes Installation
Instructions for installing inspection holes include marking and sanding the area, gluing washers and fabric patches, and painting the area before cutting the fabric to open the inspection hole.
Execution Time and Manpower
The estimated execution time for the inspection is 8 hours, requiring one mechanic. The aircraft will be detained for the same duration.
Safety notes
- Severe corrosion has been detected in routine inspections; immediate action is required to ensure safety.
Full document text
SERVICE BULLETIN Nº 25-27-09 REV 0 DATE 27/11/2023 Parque Industrial Mendoza, Eje Norte, manzana 13 lote 3 Las Heras, Mendoza – Argentina Teléfono / Whatsapp: +54 9 2614 67-7682 - EMAIL: administracion@laviaargentina.com ACOMPLISHMENT: MANDATORY 1. PURPOSE: Detect corrosion and/ or cracks on FWD and AFT wing spar. 2. BACKGROUND: Severe corrosión has been detected on PA-25, PA-25-235 and 260 airplane’s FWD and AFT spars in routine inspections. Figure 1 Also corrosión has been detected behind reinforcements P/N 60373-01/-02. as can be seen in figure 2. Figure 2 SERVICE BULLETIN Nº 25-27-09 REV 0 DATE 27/11/2023 Parque Industrial Mendoza, Eje Norte, manzana 13 lote 3 Las Heras, Mendoza – Argentina Teléfono / Whatsapp: +54 9 2614 67-7682 - EMAIL: administracion@laviaargentina.com 3. APLICABILITY: Models afected: PA-25, PA-25-235 y PA-25-260 S/N: ALL 4. COMPLIANCE TIME: Initial action: 500 HS TSN or 5 years since new (whichever occurs first) Repetitive action: 100 HS or 12 month (whichever occurs first) 5. ACTIONS: 5.1. Initial: a. Take out inspection cover from both semi wings intrados. See inspection covers ditribution drawing. If it doesn’t have installed some inspection covers indicated in Picture 3 y 4, install it according subject 6 “Inspection holes installation istruction (Picture 6)”. Also install an inspection hole in front of fwd spar attachment, according to inspection holes distrubution drawing (Picture 5) b. Inspect draing holes (washer P/N 80122-53 – 12 req) for correct position and obstruction c. Clean the área behind the wingwalk d. With help of a mirror and light, or with a borecope camera, Inspect both spars in root área and along winspan for corrosión and cracks, paying spetial atention to rinforcement P/N 60373-01/-02, union between spars with compression beams, with lift strut attachment and and with wing root attachments. e. If no corrosión or cracks are detected, protect wing to fuselage attachment, union between spars and compresión beams and unión between spars and lift strut atacment, with rust inhibitor LPS3 (**) and restore the airplane to its initial condition. f. If corrosión or cracks are detected,: f.1. Wingwalk área: Uninstall wingwalk and cover at wingwalk intrados and perform a detailed inspection. First check if corrosión only affected J sections P/N 61228-00 y 61229-00 (ítems 27 y 28 fig 3 from IPC). In that case, replace J sections, protect wing to fuselage attachments with LPS3 (**) and restore the airplane to its initial condition SERVICE BULLETIN Nº 25-27-09 REV 0 DATE 27/11/2023 Parque Industrial Mendoza, Eje Norte, manzana 13 lote 3 Las Heras, Mendoza – Argentina Teléfono / Whatsapp: +54 9 2614 67-7682 - EMAIL: administracion@laviaargentina.com Picture 1 f.2. Wingwalk area: If corrosión affected to spars too i. Contact LAVIASA for reparation instructions and allowable corrosión limits. ii. If crack are detected, contact LAVIASA. f.3. If corrosión or cracks are detected in áreas different from wing root or wingwalk área, Contact Laviasa. f.4. Whether the corrosión was blended out or the spar was replaced, it has to be protected first with application with brush or inmertion bath (whichever is more apropieate) of Alodine 1200 (*) and then with wash primer paint. Protect reinforcement P/N 60373-01/-02, wing to fuselage attachment, union between spars and compresión beams and unión between spars and lift strut atacment with LPS3 (**) and restore the airplane to its initial condition f.5. Install cover plates according picture 7 5.2. Repetitive action: same as initial action (*) MIL-C-5541E Class 1A and 3 coatings, Methods A, B & C application. (**) MIL-PRF-16173E G2 SERVICE BULLETIN Nº 25-27-09 REV 0 DATE 27/11/2023 Parque Industrial Mendoza, Eje Norte, manzana 13 lote 3 Las Heras, Mendoza – Argentina Teléfono / Whatsapp: +54 9 2614 67-7682 - EMAIL: administracion@laviaargentina.com Áreas to inspect inspection holes Picture 2 SERVICE BULLETIN Nº 25-27-09 REV 0 DATE 27/11/2023 Parque Industrial Mendoza, Eje Norte, manzana 13 lote 3 Las Heras, Mendoza – Argentina Teléfono / Whatsapp: +54 9 2614 67-7682 - EMAIL: administracion@laviaargentina.com IINSPECTION COVERS FOR SPAR INSPECTION. Picture 3 Picture 4 Drain holes SERVICE BULLETIN Nº 25-27-09 REV 0 DATE 27/11/2023 Parque Industrial Mendoza, Eje Norte, manzana 13 lote 3 Las Heras, Mendoza – Argentina Teléfono / Whatsapp: +54 9 2614 67-7682 - EMAIL: administracion@laviaargentina.com INSPECTION HOLES DISTRIBUTION Picture 5 6. INSPECTION HOLES INSTALLATION 1. Mark and mask área to sand 2. Sand the pain in the área were the inspection hole Will be installed, with 240 grit water sandpaper, on fabric Surface at the wing intrados 3. Glue washer P/N 85012-78 with contact cement in the corresponding location. 4. Glue over the washer, with contact cement, a Ceconite 101 fabric patch. 5. Paint the área with poliuretanic paint. 6. With a cutter, cut the fabric in the interior of the washer, in order to open the inspection hole. 7. Install inspection cover P/N 12761-2 8. Reference: AC43-13-1b Chapter 2 Section 1 – Item 2-14 2.5’’ New inspection Hole ø 3.5’’ SERVICE BULLETIN Nº 25-27-09 REV 0 DATE 27/11/2023 Parque Industrial Mendoza, Eje Norte, manzana 13 lote 3 Las Heras, Mendoza – Argentina Teléfono / Whatsapp: +54 9 2614 67-7682 - EMAIL: administracion@laviaargentina.com 1’’ Picture 6 Picture 7 FABRIC WASHER P/N 85012-78, GLUE WITH CONTACT CEMENT FABRIC PATCH, GLUE WITH CONTACT CEMENT SERVICE BULLETIN Nº 25-27-09 REV 0 DATE 27/11/2023 Parque Industrial Mendoza, Eje Norte, manzana 13 lote 3 Las Heras, Mendoza – Argentina Teléfono / Whatsapp: +54 9 2614 67-7682 - EMAIL: administracion@laviaargentina.com 7. EXECUTION TIME: 8 hs 8. AIRPLANE DETENTION TIME: 8 hs 9. TOOLS: Mirror, Flashlight, Cutter 10. MANPOWER: 1 Mecchanic 11. WEIGHT AND BALANCE: NOT AFFECTED 12. MATERIALS REQUIRED: (in case of findings) 1. Washer P/N 85012-78 2. Inspection Cover P/N 12761-2
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3. Section wingwalk J 61228-00 4. Section wingwalk J 61229-00 5. Front Spar 96006-0 / -1; 64055-06 / -07 6. Rear Spar 96006-0 / -1; 64056-02 / -03