Service Bulletin No. 25

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SERVICE BULLETIN NO. 25 Sky International Inc. Husky Service Bulletin No. 25 1 P.O. Box 1240 Afton, WY 83110 USA Tel: 307-885-3151 Fax: 307-885-9674 e-mail: aviat@aviataircraft.com SERVICE BULLETIN DATE: 17 January 2010 REVISION: A SUBJECT: Service Bulletin for mandatory inspection and recommended replacement of Engine Intake Box and Control Cable. AIRCRAFT MODELS AND SERIAL NUMBERS AFFECTED: Husky A-1, all serial numbers; Husky A-1A, all serial numbers; Husky A-1B, all serial numbers; Husky A-1C 180, all serial numbers; AIRCRAFT EXCLUDED FROM COMPLIANCE: All Husky model aircraft with IO-360-A1D6 engines. NOTE If you are no longer an owner/operator of the model airplane affected by this Service Bulletin, please forward this information to the current owner / operator. Aviat Aircraft, Inc. (“Aviat”) issues service information for the benefit of the owners / operators of its aircraft. There are three basic types of Service Bulletins issued by Aviat, Mandatory, Recommended and Optional. The owner/operator must comply with Mandatory Service Bulletins. Mandatory Service Bulletins are formatted in a red border and changes, modifications, alterations and inspections are considered by the manufacturers to affect the safety of the aircraft owner / operators. Recommended Service Bulletins are issued by Aviat, when there are items that the manufacturer believes will benefit the owner / operator and in the manufacturer’s opinion, should be accomplished, although are not mandatory. Optional Service Bulletins are instructive to the owner/operator but may be accomplished at the owner/operators discretion. Service Bulletins are mailed to: 1. Aviat Authorized Service Centers, and 2. Purchasers and owners of record with Aviat, and 3. Operators that subscribe to Aviat’s SB Publication Service. SERVICE BULLETIN NO. 25 Sky International Inc. Husky Service Bulletin No. 25 2 _______________________________________________________________________ Engineering Data is FAA Approved DESCRIPTION Due to the nature and location of the engine intake box and control cables, it has come to Aviat’s attention that they may be susceptible to excessive wear and tear. Such wear and tear may cause the mentioned parts to fray or break. Accordingly, a newly designed engine intake box is available for Husky owners/operators. The newly designed engine intake box is utilizes a solid damper rod shaft, bearings, a thicker damper control level, new control cable attach mechanism, and a screen. If after inspection a worn control cable or worn intake box component is revealed, Aviat recommends that all owners/operators replace the existing intake box with the newly designed version to avoid failure of this component. The newly designed engine intake boxes come in replacement kits, which contain all of the parts, gaskets and consumables needed to replace the component. Continued operation with worn or damaged components on the engine intake box may lead to engine failure if the engine ingests those parts. Careful inspection of the engine and compliance with this Mandatory Service Bulletin is necessary to ensure airworthiness of the aircraft prior to its operation. COMPLIANCE Upon receipt of this Service Bulletin, Aviat requires an immediate inspection of the engine intake box and control cable and recommends replacement if parts appear in a condition that is not airworthy. The following engine intake box kits are immediately available from Aviat. . 1. Aviat Aircraft kit number A-1-556 containing part number 35453-502 and attachment hardware for the O-360-CIG and O-360-A1P, or 2. Aviat Aircraft kit number A-1-556PUP for part number 35453-504 for O-320-D2A engine. Immediately following the mandatory inspection and / or installation of the engine intake box kit, the owner / operator must complete the attached compliance letter and send the original to Aviat and one copy to the FAA at the address indicated on the form letter. WARNING SERVICE BULLETIN NO. 25 Sky International Inc. Husky Service Bulletin No. 25 3 APPROVAL All engineering data contained in this Mandatory Service Bulletin is FAA approved. MANPOWER REQUIRED The following information is for planning purpose only and is based upon the work of experienced, properly trained and equipped personnel. Once work has commenced, additional work scope items may be revealed that will increase these estimates. Estimated person-hours for inspection: 2 Hours Estimated person-hours for removal and installation: 5 Hours Suggested number of persons required: 1 Person WEIGHT AND BALANCE ADJUSTMENTS [ ] Replacement of the engine intake box with the kits listed below does not require any weight and balance modifications due to the similarity and location of the new components. [ ] Replacement of the engine intake box with the kits listed in this Service Bulletin will require the following modifications to the weight and balance of the aircraft due to minor weight / moment modifications: ELECTRICAL MODIFICATIONS None AIRFRAME MODIFICATIONS None Weight (lbs.) Arm (in.) Moment (lb.0in.) SERVICE BULLETIN NO. 25 Sky International Inc. Husky Service Bulletin No. 25 4 REFERENCES HUSKY Repair Manual PUBLICATIONS AFFECTED None WARRANTY CREDIT None NOTE Should there be any difficulty or problem with the accomplishment of this Service Bulletin please contact Aviat Aircraft, Inc. (307) 885-3151. SERVICE BULLETIN NO. 25 Sky International Inc. Husky Service Bulletin No. 25 5 PARTS LIST NO. REQ. CODE NUMBER PART NUMBER DESCRIPTION 1 35453-502 Engine Intake Box Kit Number A-1-556 O-360-C1G and O-360-A1P Engines 1 54375 Nut, Hex Castle 1 55675 Pin, Cotter 1 58750 Washer, Flat 1 59100 Set Screw 1 79921 Bushing 1 81795 Gasket 2 feet 65520 Safety Wire 1 35453-504 Engine Intake Box Kit Number A-1-556PUP O-320-D2A Engine 1 54375 Nut, Hex Castle 1 55675 Pin, Cotter 1 58750 Washer, Flat 1 59100 Set Screw 2 79921 Bushing 1 81795 Gasket 2 feet 65520 Safety Wire SERVICE BULLETIN NO. 25 Sky International Inc.