OPTIONAL SERVICE BULLETIN

Transcription

1 OPTIONAL SERVICE BULLETIN No ATA Code SUBJECT: REASON: EFFECTIVITY: COMPLIANCE: APPROVAL: MANPOWER: LANDING GEAR - INSTALLATION OF MAIN LANDING GEAR SINGLE PIECE BRACE NUT AND COLLAR AND ELLIPTICAL BUSHfNG RETAINER This Service Bulletin is being issued to offer a single piece retainer nut and improved elliptical bushing retainer for the main landing gear strut in the fuselage support fitting. Beech Aircraft Corporation has received reports of debonding of the strut collars resulting in landing gear looseness and vibration during ground operations. BEECHCRAFT Skipper 77. serials WA-1 through WA-312. At the owner's/operator's discretion. This Service Bulletin supersedes and cancels BEECHCRAFT Service Bulletin No Engineering data contained in this Service Bulletin is FAA approved. The following information is for planning purposes only: Estimated man-hours: 8 hours. Suggested number of men: 1 man. The above is an estimate based on experienced, properly equipped personnel complying with tflis Semice Bulletin. Occasionally, after work has started, conditions may be found which could result in additional man-hours. MATERIAL: The following parts, if required for this modification may be ordered through a BEECH- CRAFT Authorized Outlet: PART NUMBER DESCRlPTlON QUANTITY PER AIRPLANE Retainer Nut 2 Required S Kit Information - Elliptical Bushing Retainer 1. If Required Installation AN Washer As Required AN L Washer As Required SPARES AFFECTED: NO BECP 0 Issued: December Safety wire required for this mofiication, may be obtained from local sources. The value of the parts required to incorporate this Service Bulletin on one airplane is to be advised. Banh Aired Corpor.lion W s vniu hhvmhidn la the bandit of mns and l i (c) Thoa Muing prmii(iom submcdpiii -- bu operalor8 n (he lam of two dsun ot Sarrice Bul!etIns. MANDATORY (Red Border) Smite Bullsfins rs changsa inqmcths and mmwiif~w 1M colld a- defy. The In'mn&ion On Omsr NaWkdm an be ObUimd -* lactory CONickm Camplimw Yim these Sawice -1- rmndstay. OPTIONAL (No Bor- B lxhcraft Outtetet. -tins -. no-ion in da) Savia Bulletii ova dl-s moditiutions nprovancne or *I- th. h~bv Ssrvi~a W i n W hdeu should be nude until tns lnda a nvissd. Wmnty rim ba leais rill bmem the aunev and alth&oh hihk raebnnmdad. limv am mt canskierad man- allowsd cnk wrksn sdscili& damsd in the Savi~c Bum rrd m uah Iha datow cornphm= at the trme ot idince: G I so w a n ~ tiie publicatlm DU. U) im M ~arc;lft ~wpormon W;.mnty P* mrk ram a( nlarnubon oowsd bv the OPTlONAL ScMm BuHalln cmh aunerlmaatar 6 nspo&blc tor conducting a ~hwh?~h %a of &h Optimal &&&hu)lerm-wgsi rnlm ~t Compliance is ragrlml based on lhe w p l i of the OPTIDNAL Mu? Bullcbn ~ ~ n ~ ~. p ~ ~ ~ o ; ~ k ~, " n ~ ~ ~ ~ m R 5 lo hs pr(lcular +ct of op.rating wndmtkmr Boah d- are mmled 1 ~ : (4 BEECHCRAFT AuI~w& OuWNs. CRAFT modified mnrpura~m c4y. BEECHCRAFT Savim Bulbths md Km y nd( ba lbl Orners al f ~ an the ~ FAA d Alr- Ragistrabon BMCh L a ard me BEECHCRAFT comprtible with ai- modified by STC inot.liatians or rnoclmims dhs than BEECH- 0 In%!rnatm=.nal Omr Nohhcohon Ssvm Lst. CRAFT Approwad kr.% - -

2 WARRANTY CREDIT: SPECIAL TOOLS: WEIGHT AND BALANCE: REFERENCES: PUBLICATIONS AFFECTED: ACCOMPLISHMENT INSTRUCTIONS: BEECHCRAFT Skipper 77 Maintenance Manual. P/N or subsequent. Chapter 7-00 and BEECHCRAFT Skipper 77 Parts Catalog, P/N B or subsequent, Chapter This Service Bulletin may be accomplished as follows: 1. Refer to Chapter 7 of the Maintenance Manual and phce the airplane on jacks. Inspect the condition of the Urethane coat- 2. Refer to Chapter of the Maintenance Manual ing on the elliptical bushing. If the coating for removal of the main landing gear. Remove only one is damaged, a new bushing will be gear at a time. required. 3. Refer to Figure 1 and remove and discard the existing collar and nut from the LH, RH or both landing gear struts. Remove the adhesive from the strut. The use of moderate heat (do not exceed 2000) may be advantageous in the removal of the existing collars and nuts. 4. Install a new PIN retainer nut. Do not tighten mtil Step 5 has been accomplished. The single piece brace nut and coflar (retainer nut) does not require bonding. 5. Prior to reinstallation of the landing gear struts. check to see if BEECHCRAFT Service Bulletin No has been accomplished previously. Service Buletin No modifies the elliptical bushing (Fig 2) by the addition of the bushing retainer contained in Kit No S. If this modification has not been accomplished, remove the elliptical bushings from the fuselage fittings and perform the following: a. Locate the two tooling holes in the inboard side of the elliptical bushing. Drill a inch diameter hole to a depth of -56 inch. Tap the holes to 5/16-24 thread, starting with a tapered tap and finishing with a b. When installing the retainer ensure that the alignment dots on the elliptical bushing and strut support fing are aligned exactly. Using a spanner wrench. torque the P/N retainer nut (Fig2) to inch-pounds. Ensure that the alignment dots align after torquing. Safety the retainer nut. In some cases. the retainer nut may contact the strut support fitting prior to reaching full torque. It is permissible to remove sufficient material from the edge of the strut support fitting ta permit torquing the retainer nut. c. Install a PIN retainer as shown in Figure 2 using two PIN M /M/ bolts. Place P/N AN or P/N AN L washers (obtain locally) between the bushing and retainer as required to maintain a spacing of -03 to -09 inch between the retainer and support fitting as shown in Figure 2. Torque the bolts to inch-pounds and safety. d. Reinspect for.03 to -09 inch clearance between the retainer and support fitting. 6. Reinstall both landing gears in accordance with the Maintenance Manual. bottoming tap as shown in Fgure Remove the airplane from the jacks.

3 REMOVE EXISTING COLLAR AND NUT AND REPLACE WITH A P/N NUT. TYPICAL FOR BOTH MAIN UM)ING GEARS. LANWNG GEAR STRUT FORWARD LH UNMNG GEAR SHOWN RH TYPICAL Figure 1

4 Service Bulktin No INBOARD SIDE OF ELLIPTICAL BUSHING ALIGNMENT DOTS (On Bushing and Strut Support Fitting) TOOLING HOLES DRILL TO.56 INCH DEPTH WITH AN I ( INCH) DRILL BIT FLAT SHOULDER 1 U OUTBOARD SIDE OF ELL1 PTICAL BUSHING.03 to -09 INCHES\// SAFETY WIRE SUPPORT FITTING ELLIPTICAL BUSHING BRACE NUT (as required) VIEW LOOKING OUTBOARD DOWN CENTER LINE OF Sl FROM INSIDE OF CABIN VIEW LOOKING AFT THROUGH STRUT AND SUPPORT FITTING RETAINER Figure 2

5 RECORD COMPLIANCE: Upon completion of this Service Bulletin, make an appropriate maintenance record entry. If you are no longer in possession of this airplane. please forward this information to the present owner. Sof 5