Husky Service Bulletin No. 28

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SERVICE BULLETIN NO. 28 Aviat Aircraft Inc. Husky Service Bulletin No. 28 1 P.O. Box 1240 Afton, WY 83110 USA Tel: 307-885-3151 Fax: 307-885-9674 E-mail: aviat@aviataircraft.com DATE: April 02, 2015 SUBJECT: Stabilizer Support Tube Inspection and Repair REVISION: A HUSKY MODELS: A-1, A-1A, S/N 1468 & BELOW A-1B, S/N 2397 & BELOW A-1B-WF, S/N 0002 & BELOW A-1B-NF, S/N 0008 & BELOW A-1C, S/N 3198 & BELOW Engineering Data is FAA Approved. _____________________________________________________________________ TABLE OF CONTENTS Description and Compliance…….....……………………………………………….…1 Parts List…….....…………………………………………………………………....……...2 Instructions……………...…………...….....……………...…………………….……….2-3 Compliance Letter…...………….…………………………………………………………4 DESCRIPTION The Rear Stabilizer Support Tube, part number 30800-111 (All S/N’s), will be superseded by new part number 35001-112 in new production aircraft. The rear stabilizer support tube is located in factory master jigs, it is not suggested that the rear stabilizer support tube be replaced in the field due to alignment issues. This action is due to reported incidents of Stabilizer Support Tube failure. Refer to the Instructions section of this Service Bulletin for inspection and repair procedures for all previous Husky aircraft. COMPLIANCE Before next flight and every 100 hours of flight time or during Annual Inspection thereafter, inspect rear stabilizer support tube p/n 30800-111 for damage. Terminating action for this Service Bulletin will be the compliance repair and submission of Compliance Letter. Please complete the Instruction portion of this service bulletin; then complete the attached Compliance Letter, copy and send to addresses provided. SERVICE BULLETIN NO. 28 Aviat Aircraft Inc. Husky Service Bulletin No. 28 2 Field Repair PARTS LIST 1. Husky Repair Kit #SB-28 includes: (4 ea) Stabilizer mounting bolts, and self-locking nuts (1 ea) Stabilizer Tube, Rear INSTRUCTIONS 1. Mandatory Inspection: a. Begin by removing inspection access covers located above and below rear support tube. b. Visually inspect entire circumference of support tube at weld joint between fuselage frame and fabric for corrosion or damage. c. If damage is verified or suspected, proceed to Recommended Repair instructions. 2. Recommended Repair: a. Mark and record adjustments of tail rigging and controls as necessary. b. Loosen all attach bolts and remove elevators and stabilizers. c. If you suspect damage to weld joints, perform a resonance test by tapping on support tube and listening for “dead” sounding resonance. d. If mechanic is unable to effectively determine damage, it may be decided that fuselage fabric must be opened to enable access for a more thorough investigation or to perform a weld joint repair. If damage is detected, proceed to (e). If no damage is detected, proceed to (f/g). e. Insert repair tube inside existing stabilizer support tube, align bolt holes, and weld both ends using AWS ER70S-2 welding rod in accordance with AC 43.13-1B, Chapter 5. f. Make repairs to fuselage fabric as required. For materials and process specification questions regarding fabrics, dopes, and paints, contact Aviat Aircraft Parts Department. See contact information on page 1. g. Reinstall stabilizers, elevators and controls. h. It is recommended to replace all stabilizer mounting bolts & nuts. Any questions on rigging, refer to Instructions for Continued Airworthiness Doc: Model A-1, A-1A; see 70192-002 section 1, 3.10, Model A-1B; see 70192-004 section 1, 3.10, Model A-1C; see 70192-006 section III, 5.2d. NOTE: • It is the responsibility of owner/operator to have FAA authorized repairmen perform this work. SERVICE BULLETIN NO. 28 Aviat Aircraft Inc. Husky Service Bulletin No. 28 3 A A HUSKY TAIL SIDE VIEW NTS STABILIZER SUPPORT TUBE REPAIR DETAIL SEC A - A EXISTING FUSELAGE FRAME ALIGN BOLT HOLES WITH EXISTING TUBE BOLT HOLES NEW SUPPORT TUBE INSERT, PN: 30800-113 INSERT REPAIR TUBE AND WELD BOTH ENDS FUSELAGE SKIN WELD JOINT INSPECTION POINTS, REPAIR WELD AS REQ'D REAR STABILIZER SUPPORT TUBE ( 30800-111 ) 1/16 SERVICE BULLETIN NO. 28 Aviat Aircraft Inc. Husky Service Bulletin No. 28 4 SERVICE BULLETIN #28 COMPLIANCE LETTER This is to certify that I have complied with this Service Bulletin by completing Aviat Aircraft instructions for mandatory inspection and recommended service of the Stabilizer Support Tubes. Husky Model _______ Serial Number_________ Registration Number____________ Date: __________________ Aircraft Hours: ____________ Authorized Mechanic ____________________________ Lic. No. _____________ Aircraft Owner: ________________________________________ Address: _______________________________________ _______________________________________ Signed: _______________________________________ Send to: Aviat Aircraft Inc. Engineering Dept. P.O. Box 1240 Afton, WY 83110 Fax: 307-885-9674 Send copy to: Federal Aviation Administration Denver Aircraft Certification Office Attn: Roger Caldwell 26805 East 68th Avenue, Room 214 Denver, CO 80249-6361 Fax: 303-342-1088 (Please attach comments on separate page)