1、MS51778 53 7777712 000b456 4 W wc c, 02 AS awtwr wecirnncw Na A?:ICAB?E fcW TMWD, RING LOCKED, INSERTS FOR TAPPED HOES SHALL BE SUBJECT TO THE POLLOWING LIMITATIONS AND USAGE: TITLt INSERT, SCREW THREAD-LOCKED IN, UWI1ATIONS FOR MIL ITA87 ST AY DA ID MSS1998 RIHO LOCKED, SERRATED, DESIGN AND USAE c.
2、 r: SHEET , wmeoes I. 2. o. 4. 5. 6. 7. 8. SLF-LOCKING INSERTS SHALL NOT BE USED AS FOLLOWS: (a) AT JOINTS IN CONTROL NSTEMS AT SINGLE AllACHMENTS OR WHERE LOSS OF DOLT WOULD AFRCT SAFEN OF FLIGHT. (b) WITH AN EXlERNAlLY THREADED PART THAT SERES AS AN MIS OF ROTATION FOR ANOTHER PART UNE55 ME EXTERN
3、ALLY THREADED PART IS HELD BY A POSITIVE LOCKING DEVICE THAT REQUIRES SHEARING 01 RWTURE OF MATERIAL BEFORE TORSIONAL LOADS WOULD BE APPLIED TO THE EXTERNALLY THREADED PART IN SUCH A MANNER AS TO RELIEM THE INITIAL SRESSES OF THE ASSEWLY. EXAMPLE: BEARINGS, BUSHINGS, CLAMPUP BUSHINGS, PULLEYS, CPiSK
4、S, LEVERS, LINKAGES, HINGE PINS, AXLES, SHAFTS, SPINDLES, GEAQS, CAMS, CA4 FOLLOWERS. SLIDING MECHANISMS, AND PIVOT POINTS. - (c) AT ANY SINGLE BOLTED STRUCTURAL JOINT WHICH SESVES AS A PRIMARY LOAD PATH, THE FAILURE OF WHICH WOULD ENDANGER THE SAFEN OF PERSONNEL OR WOULD RENDER THE EQUIPMENT INOPER
5、ATIVE OR CAUSE ITS DESTRKTION. EXAMPLE: FIXED JOINTS, TIE ROD, STRUTS (FIXED LENGTH MEMBERS) WING ATTACHMNTS TO FUSELAGE, STABILIZER WRFACE ATTACHMNTS, LONGEPON JOINTS, ALIGYTING GEAR JOINTS, AND ENGIFiE MOUNTS. INYRTS USED AS STRUCTURAL FASTENERS ARE INTENDED TO BE LOADED PREWMINAELY IN TENSION. ST
6、RUCTVIUIL JOINTS CARRYING SHEAR LOADS SHOULD BE DESIGNED TO PSECLUDE SUBJECTING THE INSERTS TO SHEM LOADS. INSERTS ARE PRIWRILY USED TO PROVtM HIGHER STRENGTH CAPABILITIES OR MORE PERMANENT THREADS IN RELATIVELY LOW STRENGTH SXJCTUIAL MATERIALS. THE SATERIALS ARE 2EEQ9ED TO AS THE “PARENT MATRIM” WI
7、TH RESPECT TO THIS STANDARD. ROUND OR CHAMFERED END BOLTS, STUDS, OR SCREWS MUST EXTEND AT LEAST THE WLL ROUND OR CHAMFER THROUGH SELF-LOCKING INSERTS. INSERTS WHICH ARE INSTALLED IN THE STRUCTURE SHALL BE INSTALLEDlh A PDSITIVE MANNES A: 52ECIC;FD IN MSSlW5 i0 ELIMINATE THE POSSlalLITy OF THEIR ROT
8、ATIONAL DISPLACEMENT WhEN INSTA?IX 02 REMOVING WITHOUT INJURY TO THE PARENT MATEaIAL TO PERMIT REPLACE.MdT BY AN IENTICAL INSERT AND LOCKRING. ALL SELF-LOCKING INSERTS THAT HAVE HAD THE LOCING ELEVENT REVIQRKED OR REPROCESSED BY OTHER THAN THE INSEXT MANUFACTURER SHALL NOT BE USED BY CONTRACTORS OR
9、FIELD MAINTEN4NCE PERSONNEt OF THE SERVICES. SELF-LOCKING INSERTS WALL NOT BE USED IN CONJUNCTION WITH BOLTS OR SCREWS ON JET ENCINE- AIICRAFT IN LOCATIONS WHERE THE LOOSE BOLT 02 SCREW COULD BE INGESTED THROUGH THE ENGINE AIR INTAKE XOW. IN TtE PROCESS OF WING A MSIGN SELECTION OF INSERTS IN SVLCl?
10、JiIAL WPLICATIONS IT IS NECESSARY THAT TAE PROER DEGREE Of CONSIDinATION 6E GIVEN TO THE AXIAL LOAD CAZRYING CAPABILITIES OF THE INSTALLED INSERT IN THE SPECIFIC PARENT MATERIAL. THE AXIAL LOAD CNABILITY RESISTANCE TO PULLOU) OF AN INSTALLED INSERT IS THE PRODCICT OF TH SHE4R ENGAGEMENT AREA OF THE
11、INSERT EXTERNAL THREAD AND THE SHEAR ULTIMAl STRESS OF THE PARENT MAERIA,. (a) THE MATING BOLTS on SCREWS. INSTALLATION AND REMOVAL OF THE LOC(PING SHALL aE ACCOW:IS.IED THE SWM ULTIME STRESS (FJ FOR MOST MERIALS IS LISTED IN MIL HANDBOOK 5. ) THE SHEAR ENGAGEMENT UIEAS OF THE INSERT EXTEiINAL THREADS ARE LISTED IN MIL-14910. (e) WEM ENGAGEMNT ARFA IS THE ASSEMBLED DIMENSIONAL VALUE FCH THE OVERALL ENGAGED AREA OF MATING THREAD MEMBERS. IT DOES NOT REPRESENT A DIMNSION OF EITHER OF THE MEMbERS IN AN UNASSEMLED CONDITION. ,- - - Licensed by Information Handling Services
