1、MIL-HDBK-27 1-103 14 JANUARY 1986 AIRCRAFT FASTENER INSTALLATION AND REMOVAL METHODS FOR ATTACHED RETENTION ELEMENT (A.R.E.) SELF-LOCKING FLOATING . NUT ASSEMBLIES Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-DEPARTMENT OF DEFENSE WASHINGTON 25, D
2、C 20361 MIL-HDBK-271-103 Aircraft Fastener Installation and Removal Methods for Attached Retention Element (A.R.E.) Self-Locking, Floating Nut Assemblies 1. This standardization handbook was developed by the Department of Defense in accordance with established procedure. 2. The publication was appro
3、ved on 14 January 1986 for printing and inclusion in the military standardization handbook series. 3. This handbook provides installation and removal methods for attached retention elenent (A.R.E.) self-locking, floating nut assemblies. It will provide valuable information and guidance to aircraft m
4、echanics at Army, Navy and Air Force Rework Facilities. This handbook is not intended to be referenced in procurement specifications except for in- formation purposes, nor shall it supersede any specification requirements. 4 Every effort has been made to include the latest information on installatio
5、n and removal methods of A.R.E. nuts. Mechanics should review this handbook periodically. Users of this hand- book are encouraged to report any errors or recommendations to the Commanding Officer, Naval Air Engineering Center, Code 93, Lakehurst, NJ“ 08733-51 OO. ii “ Provided by IHSNot for ResaleNo
6、 reproduction or networking permitted without license from IHS-,-,-Paragraph 1 . 1.1 1.2 1.3 1.4 2 . 3 . 3.1 3.2 3.2.1 3.2.2 3.3 3.4 4 . 4.1 4.2 4.2.1 4.2.2 4.2.3 4.3 4.4 4.4.1 4.4.2 4.5 4.6 4.6.1 4.7 4.7.1 4.7.1.1 4.7.1.2 4.7.1.3 4.7.1.4 4.7.1.5 4.7.1.6 4.7.1.6.1 4.7.1.6.2 5 . 5.1 5.1.1 5.2 5 3 5.4
7、 MI L-HDBK-271-103 TABLE OF CONTENTS Page SCOPE 1 Scope 1 Nut assembly types . 1 A.R.E. nut description . 1 A.R.E. nut applications 2 REFERENCED DOCUMENTS . 2 TOOLS AND GAGES 4 Drill bits . 4 Installation tools . 4 Hand tools . 6 Pneumatic tool . 6 Air-hydraulic tool . 6 INSTALLATION PROCEDURES 7 Se
8、lection of fasteners . 7 Selection . of tooling . 8 Tooling for types of material 10 Tooling for types of fasteners 11 Tooling accessibility 11 Installation holes . 13 Arbor press tool . 6 Hole preparation . 11 Edge distance 13 Hole quality and tolerance . 14 Fastening procedures . 15 Puller checks
9、15 Safety precaution 15 Fastener installation . 16 Inspection of installed fasteners . 16 Lopsided and cracked upsets 16 Periphery cracks . 16 Swage protusions . 17 Cage seating . 17 Inspection of self-sealing nut . 18 Pressure gage inspection of seat nuts 19 Screw-in type gage . 19 Clamp-on .type g
10、age . 21 NUT REMOVAL AND ELEMENT REPLACE- MENT PROCEDURES 22 A.R.E. nut assembly removal 22 Recomended removal method . 22 Removal tools 22 A.R.E. nut element removal tool 22 A.R.E. nut assembly removal tool . 23 Provided by IHSNot for ResaleNo reproduction or networking permitted without license fr
11、om IHS-,-,-TABLE OF CONTENTS (Conti nued) Paragraph Page 5.5 5.5.1 5.5.2 5.5.3 5.5.3.1 5.5.4 5.6 5.7 5.8 5.8.1 5.8.2 5.8.3 5.8;4 5.9 5.9.1 5.10 5.11 . 5.12 5.13 5.14 Replacement procedure 23 A.R.E. nut element replacement . 23 Optimal removal methods 25 Drilling swage or flare 25 Milling swage or fl
12、are . 25 Reaming swage or flare . 26 Damaged holes 27 Gages 27 Panel thickness gage . 27 Seal nut height gage . 27 Seal nut pressure gage . 27 Rotation of nut assembly sleeve 27 Troubleshooting guide 29 Flare cracks . 29 Torque-out below specification . 30 Nut element does not float before installat
13、ion . 32 Nut does not accept mating part or gage 33 Nut element falls out of cage 33 Seal nut leaks under pressure 33 En-l arged holes . 27 iv Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-1 . 2 . 3 . 4 . 5 . 6 . 7 . 8 . 9 . 1 o . 11 . 12 . 13 . 14
14、 . 15 . 16 . 17 . 18 . 19 . 20 . 21 . 22 . 23 . 25 . 25 . 27 . 28 . 29 . 30 . 31 32 . 33 . 34 . 35 . 36 . 37 . 38 . 39 . 40 . 41 . 42 . 43 . 44 45 . 46 . 47 . 24 . MIL-HDBK-271-103 FIGURES Page Nut assembly types . 1 Standard nut components 1 Seal nut components 2 . Mounting and installation 2 Panel
15、 thickness 7 Measuring panel thickness and sleeve length . 7 Standard hand tool for locking fasteners 8 Hand tool for field installation . 8 Arbor press tool . 8 Holdins tools 9 Pneumatic tool . 9 Air-hydraulic tool . 9 Drill bit types 11 Types of installation 13 . Edge distance 13 Lobes pulled into
16、 the panel 14 Fastener swaged or flanged against the panel 14 Relieved threads of puller . 15 Nut plate puller . 15 Tooling problem 16 Medium cracks 16 Severe cracks 17 Flushness of upset . 17 Unacceptable cage setting 18 Seal nut height cage . 18 Installed nut height . 19 Gasket compression . 19 Ga
17、ge. screw-in type 20 Gage. clamp-on type 21 Microstop countersunk tool . 22 Types of removal tools . 22 Removal nut element : 23 Installation nut element . 24 A.R.E. nut assembly removal 24 Drilling flare or swage 25 -li 11 i ng flare or swage. preferred method . 25 Mi 11 ing f 1 are or swage. al te
18、rnate method . 26 Reaming flare or swage . 26 Nut plate installation . 29 Bent cage 32 . Ears bent 32 Incomplete seal 34 Uneven seal compression 34 Buckled panel. bad seal contact 34 Punctirred nut housing 35 . Light cracks . 16 Acceptable cage setting 18 V . : . . . Provided by IHSNot for ResaleNo
19、reproduction or networking permitted without license from IHS-,-,-MIL-HDBK-271 -103 53 9979970 00069b1 2 MIL-HDBK-271-103 TABLES Page I . Installation tool features . 5 II . Types of material 10 III . Standard and high shear hole diameters 12 IV . Hole diameters for reduced diameter sleeves . 12 V .
20、 Reamer diameters . 26 VI . Table of oversize nuts . 27 VI1 . Table of riveted nut plates 28 VI11 . Table of bushing diameters . 28 Vi Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-b .“ , . .-. :. . MIL-HDBK-271-103 1. SCOPE .- 1.1 Scope. This hand
21、book covers the instal- lation, removal and repair methods for attached retention element (A.R.E.) floating nut assem- blies. 1.2 Nut assembly types. There are two basic types of nut assemblies: the standard type and self-sealing type. The standard type is de- signed to accomnodate various structura
22、l re- quirements, heavy shear loads, high corrosion steel requirements and oversize repair nuts. The self-sealing type is designed with a hermetic GRES steel housing and is provided with a elastomeric seal ring to prevent leak paths (see Figure 1). STANDARD SELF-SEALING FIGURE 1. Nut assembly types.
23、 1.3 A.R.E. nut description. The standard nut assembly is made up of three components: a nut element, sleeve and cage (see Figure 2). The standard self-sealing nut assembly is made up of five components: a housing, nut element, sleeve, cage and seal (see Figure 3). The nut assembly is installed in a
24、 single hole by means of the sleeve component. The sleeve is inserted through a panel or workpiece and flared or swaged to captivate the nut to the structure (see Figure 4). SLEEVE CAGE FIGURE 2. Standard nut components. 1 Provided by IHSNot for ResaleNo reproduction or networking permitted without
25、license from IHS-,-,-. MIL-HDBK-271 -L03 53 M1L-HDBK-271-103 H 7797970 0006763 b H HOUSING ELEMENT ,SLEEVE CAGE SEAL FIGURE 3. Seal nut components. FLARED SWAGED FIGURE 4. Mounting and installation. 1.4 A.R.E. nut applications. A.R.E. nuts are used in accordance with the design and usage limitations
26、 of MS14199 and iMS33588. The nuts are designed to meet the requirements of MIL-N- 25027. 2. REFERENCED DOCUMENTS SPECIFICATIONS MI L ITARY MIL-N-25027 Nut, Self-Locking, 250F, 450F and 800F STANDARDS MI L ITARY MS14199 Nut Assembly, Floating, Self-Locking, Rivetless, Attached Retention Element (A.R
27、.E.), Maintainability and Reliability Design and Usage Limitations for MS14200 Nut, Floating, Self-Locking, Attached Retention Element (A.R.E.), 450“F, Steel, 125 KSI Ftu, Replaceable Nut Element 2 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-
28、HDBK-271-103 STANDARDS (Continued) MILITARY (Continued) MS14201 Nut, Self-Floating, Self-Locking, Attached Retention Element (A.R.E.) 450“F, Steel, 125 KSI Ftu, Replaceable Nut Element, 1 /64 Oversize Repair MS1421 O Nut, Floating, Self Locking, Attached Retention Element (A.R.E.) 450F, Steel, 125 K
29、SI Ftu, Replaceable Nut Element MS14211 Nut, Floating, Self-Locking, Attached Retention Element (A.R.E.), 450“F, Cres Steel, 125 KSI Ftu, Replaceable Nut Element, 1/64 Oversize Repair MS2 1 05 1 Nut, Self-Locking, Plate, One Lug, Low Height, Alloy Steel, 125 KSI Ftu, 450F MS2 1 060 Nut, Self-Locking
30、, Plate, Two Lug, Floating, Low Height, Cres, 125 KSI Ftu, 450F and 800F MS21061 Nut, Self-Locking, Plate, One Lug, Floating, Low Height, Alloy Steel, 125 KSI Ftu, 450F MS2 1 062 Nut, self-Locking, Plate, One Lug, Floating, Low Height, Cres, 125 KSI Ftu, 450F and 800F MS21076 Nut, Self-Locking, Plat
31、e, Two .- Lug, Floating, Reduced Rivet Spacing, Low Height, Cres, 125 KSI Ftu, 45OOF and 800F MS33588 Nut, Self Locking, Aircraft Design and Usage Limitations of 3 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-HDBK-271 -103 53 MIL-HDBK-271-103
32、m 9773970 0006965 T m NATIONAL AEROSPACE STANDARDS (NAS) NAS 1 031 Nut, Self-Locking, Plate, Two Lug, Regular Height, Floating NAS 1 032 Nut, Self-Locking, Plate, One Lug, Regular Height, Non-Csk, Floating (Application for copies should be addressed to National Standards Association, 5161 River Road
33、, Washington , DC 2001 6. ) 3. TOOLS AND GAGES Use the following tools and gages to install and check the nut assemblies: a. Drill bits b. Installation tools c. Gages 3.1 Drill bits. Use drill bits to drill the hole and simultaneously counterbore and counter- sink according to with the type of mater
34、ial to be drilled and the type of installation required (see.4.2.3). 3.2 Installation tools. Installation tools are available in four (4) groups. a. Hand tools b. Arbor press tools c. Pneumatic tools d. Air-hydraulic tools Table I reflects some of the important features to consider when selecting an
35、 installation tool. 4 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-HDBK-271-103 TABLE I. Installation tool features. - Tool Capabilities Small quant i ty instal lation Large quantity installation Single operation function Two operation functio
36、n Swage/lOO” f 1 are captivation Nut thread engaged Nut thread not engaged High speed operat i on High insertion for stainless steel Portabi 1 i ty Close Edge Dist. capability Edge distance 1 imi ted Normal hand force Finger pressure Use for self sealing nuts Three button operat i on 7 t 1 ” I ! I I
37、 land Too 1 - X X X X X X X Arbor Press Too 1 X X X X X X X Ineumat ic Too 1 Ai r iydraul ic X X X X X X X X “X - 1/ Holding tools of the.magnetic, collet or plier types are used to hold A.R.E. nut plates and self-sealing nut plates during.installation with the hydraulic tool (see Figure 10). 5 Prov
38、ided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-. . . ._ . . 3.2.1 Hand tools. Use hand tools to install fasteners where the workpiece is too large to be brought under an arbor press and accessibility is a problem. Standard hand tools perform the install
39、ation by seating the lobes or by flaring or swaging the sleeves. 3.2.2 Arbor press tool. Use an arbor press tool to instal 1 fasteners where the workpiece can be placed under the ram, where edge dis- tances are limited only by press throat depth and where the installation requires high in- sertion f
40、orces such as in stainless steel (see 4.1). 3.3 Pneumatic tool. A portable pneumatic tool requires an air supply of 90-110 psi (pound per square inch) and is a fast acting tool. Use this tool for a large number of installations at high speed and where edge distances are less than 1.400“. Use the pne
41、umatic tool for instal- lations requiring high insertion forces such as in stainless. steel panels (see 4.1). 3.4 Air-hydraulic tool. Use an air-hydraulic tool for a large number of installations where there is a high speed requirement and edge dis- tance and accessibility are a problem. The air-hyd
42、raulic tool is considered to be the only power tool that works on self-sealing nut plates ,. and requires the use of a holding tool to over- come the torque originated by the full thread mandrel going through the locking feature (see 4.1). -. . - 6 Provided by IHSNot for ResaleNo reproduction or net
43、working permitted without license from IHS-,-,-MIL-HDBK-271-103 4. INSTALLATION PROCEDURES 4.1 Selection of fasteners. Select the fas- tener in accordance with appropriate engineering criteria for the specific application. The basic features of the A.R.E. nut such as s:eeve diameters and sleeve leng
44、ths should match the characteristics of the mounting structure. The panel thickness (p.t.) determines the fastener sleeve length (see Figures 5 and 6). “y -SLEEVE LENGTH FIGURE 5. Panel thickness. MEASURING SLEEVE LENGTH STEP A UEASURING PANEL THICKNESS Note: (a) One side will measure the plain or c
45、ounterbored panel thickness; the other will measure the countersunk panel thickness. Note: (b) Code found on step “A“ must match the code found on step IIB.“ FIGURE 6. Measuring panel thickness and sleeve length. 7 Provided by IHSNot for ResaleNo reproduction or networking permitted without license
46、from IHS-,-,- -. . MIL-HDBK-271 -103 53 M1“HDBK-271-103 W 9999970 O006969 7 m .- - -. .- . 4.2 Selection of tooling. Determine the selec- tion of tooling by the type of installation structure material, type of fastener and acces- sibility (see Figures 7 thru 12). Installing fasteners in plain holes,
47、 counterbored holes and countersunk holes will require flaring tips for each set of tooling to properly install the fastener. x “HANULt ASSEMBLY N PULLER ADAPTER *W- - PULLER FIGURE 7. Standard hand tool for locking fasteners. U FIGURE 8. Hand tool for field installation. VARIABLE L NYLON PAD FOR DE
48、LICATE SURFACES I /2“ SHANK ADAPTER FOR I 12“ ARBOR HOLES FIGURE 9. Arbor press tool. , I Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-.- . .- . -. . .-. MIL-HDBK-271 -L03 53 m 9979970 0006970 3 m MIL-HDBK-271-103 HOLDING TOOL SELF-SEALING A.R.E. NUTS HOLDING TOOL, A.R.E. NUT PLATES FIGURE 10. Holding tools. FIGURE 11. Pneumatic tool. I. -GUN . -_ FIGURE 12. .Air hydraulic tool. - 9 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-4.2.1 Tooling for types of m
