Par 11-220 Page 11-99 FIGURE 11-28. CABLE MARKERS FIGURE 11-29. TIE-DOWN STRAP INSTALLATION
Par 11-220 Page 11-100 TABLE 11-20. SELECTION TABLE FOR STANDARD SLEEVES Wire or Cable Diameter Range (inches) Markable Length * (inches) Installed Sleeve Length (nom) (inches) Installed Wall Thickness (max inches) As-Supplied Inside Diameter (min inches) Min Max
0.050 0.080 18 1.5 0.026 0.093
0.075 0.110 18 1.5 0.026 0.125
0.100 0.150 18 1.5 0.028 0.187
0.135 0.215 18 1.5 0.028 0.250
0.200 0.300 18 1.5 0.028 0.375
0.135 0.300 18 1.5 0.028 0.375
0.260 0.450 18 1.5 0.028 0.475 * Based on 12 characters per inch TABLE 11-21. SELECTION TABLE FOR THIN-WALL SLEEVES Wire or Cable Diameter Range (inches) Markable Length * (inches) Installed Sleeve Length (nom) (inches) Installed Wall Thickness (max inches) As-Supplied Inside Diameter (min inches) Min. Max.
0.035 0.080 22 1.75 0.020 0.093
0.075 0.110 22 1.75 0.020 0.125
0.100 0.150 21 1.75 0.021 0.187
0.135 0.225 21 1.75 0.021 0.250 * Based on 12 characters per inch
Par 11-220 Page 11-101 TABLE 11-22. SELECTION TABLE FOR HIGH-TEMPERATURE SLEEVES Wire or Cable Diameter Range (inches) Markable Length * (inches) Installed Sleeve Length (nom) (inches) Installed Wall Thickness (max inches) As-Supplied Inside Diameter (min inches) Min Max
0.035 0.080 18 1.5 0.019 0.093
0.075 0.110 18 1.5 0.016 0.125
0.100 0.150 18 1.5 0.018 0.187
0.135 0.215 18 1.5 0.018 0.250
0.200 0.300 18 1.5 0.018 0.375
0.260 0.450 18 1.5 0.018 0.475 * Based on 12 characters per inch TABLE 11-23. SELECTION TABLE FOR CABLE MARKERS Cable Diameter Range (inches) Type of Cable Marker Number of Attachment Holes Number of Lines of Type Marker Thickness (nom) (inches)
0.25-0.50 Standard, 135 °C 4 2 0.025
0.25-0.50 High Temperature, 200 °C 4 2 0.020
0.25-0.50 Nuclear, 135 °C 4 2 0.025
0.50-up Standard, 135 °C 4 3 0.025
0.50-up Standard, 135 °C 6 3 0.025
0.50-up High Temperature, 200 °C 4 3 0.020
0.50-up High Temperature, 200 °C 6 3 0.020
0.50-up Nuclear, 135 °C 4 3 0.025
0.50-up Nuclear, 135 °C 6 3 0.025
Par 11-220 Page 11-102 TABLE 11-24. PLASTIC TIE-DOWN STRAPS (MS3367, TYPE I, CLASS 1) Cable Diameter (inches) Tie-Down Strap MS3367- Strap Identification * Installation Tool Tension Setting Min Max 1/16 5/8 4-9 Miniature (MIN) MS90387-1 2 1/16 1¼ 5-9 Intermediate (INT) MS90387-1 4 1/16 4 2-9 Standard (STD) MS90387-1 6 3/16 8 6-9 Heavy (HVY) MS90387-2 6 * The specified tool tension settings are for typical cable application. Settings less than or greater than those specified may be required for special applications.
(4) Select the applicable installation tool and move the tension setting to the correct position. (See Figure 11-30.)
(5) Slide tip of strap into opening in the installation tool nose piece. (See Figure 11-30.)
FIGURE 11-30. TIE-DOWN STRAP INSTALLATION TOOL (
6) Keeping tool against head of tie-down strap, ensure gripper engages tie-down strap, and squeeze trigger of installation tool until strap installation is completed as shown in Figure 11-31.
Par 11-220 Page 11-103 FIGURE 11-31. COMPLETED INSTALLATION 11 -221. TEMPORARY WIRE AND CABLE MARKING PROCEDURE. A temporary wire marking procedure follows but should be used only with caution and with plans for future permanence. (See Figure 11-32.)
FIGURE 11-32. TEMPORARY WIRE IDENTIFICATION MARKER
a.
With a pen or a typewriter, write wire number on good quality white split insulation sleeve.
b. Trim excess white insulation sleeve, leaving just enough for one wrap around wire to be marked, with number fully visible.
c. Position marked white insulation sleeve on wire so that shielding, ties, clamps, or supporting devices need not be removed to read the number.
d. Obtain clear plastic sleeve that is long enough to extend 1/4 inch past white insulation sleeve marker edges and wide enough to overlap itself when wrapped around white insulation and wire.
e. Slit clear sleeve lengthwise and place around marker and wire.
f. Secure each end of clear sleeve with lacing tape spot tie to prevent loosening of sleeve.
11-222. MARKER SLEEVE INSTALLATION AFTER PRINTING. The following general procedures apply:
Par 11-222 Page 11-104
a. Hold marker, printed side up, and press end of wire on lip of sleeve to open sleeve.
(See Figure 11-33.)
FIGURE 11-33. INSERTING WIRE INTO MARKER
b. If wire has been stripped, use a scrap piece of unstripped wire to open the end of the marker.
c. Push sleeve onto wire with a gentle twisting motion.
d. Shrink marker sleeve, using heat gun with shrink tubing attachment. (See Figure 11-34.)
FIGURE 11-34. SHRINKING MARKER ON WIRE 11 -223.–11-229. [RESERVED.]
Par 11-230 Page 11-105 SECTION 17. CONNECTORS
11-230. GENERAL. There is a multitude of types of connectors. Crimped contacts are generally used. Some of the more common are the round cannon type, the rectangular, and the module blocks. Environmental resistant connectors should be used in applications subject to fluids, vibration, thermal, mechanical shock, and/or corrosive elements. When High Intensity Radiated Fields (HIRF)/Lightning protection is required, special attention should be given to the terminations of individual or overall shields. The number and complexity of wiring systems have resulted in an increased use of electrical connectors. The proper choice and application of connectors is a significant part of the aircraft wiring system. Connectors must be kept to a minimum, selected, and installed to provide the maximum degree of safety and reliability to the aircraft. For the installation of any particular connector assembly, the specification of the manufacturer or the appropriate governing agency must be followed.
11-231. SELECTION. Connectors should be selected to provide the maximum degree of safety and reliability considering electrical and environmental requirements. Consider the size, weight, tooling, logistic, maintenance support, and compatibility with standardization programs. For ease of assembly and maintenance, connectors using crimped contacts are generally chosen for all applications except those requiring a hermetic seal. (Refer to SAE ARP1308, Preferred Electrical Connectors for Aerospace, Shipboard, Ground Vehicles and Associated Equipment.) A replacement connector of the same basic type and design as the connector it replaces should be used. With a crimp-type connector for any electrical connection, the proper insertion or extraction tool must be used to install or remove wires from such a connector. Refer to manufacturer or aircraft instruction manual. After the connector is disconnected, inspect it for loose soldered connections to prevent unintentional grounding. Connectors that are susceptible to corrosion difficulties may be treated with a chemically inert waterproof jelly.
11-232. TYPES OF CONNECTORS. Connectors must be identified by an original identification number derived from MIL Specification (MS) or OAM specification. Figure 11-35 provides some examples of MS connector types. Several different types are shown in Figures 11-36 and 11-37.
a. Environmental Classes. Environment-resistant connectors are used in applications where they will probably be subjected to fluids, vibration, thermal, mechanical shock, corrosive elements, etc. Firewall class connectors incorporating these same features should, in addition, be able to prevent the penetration of the fire through the aircraft firewall connector opening and continue to function without failure for a specified period of time when exposed to fire. Hermetic connectors provide a pressure seal for maintaining pressurized areas. When EMI/RFI protection is required, special attention should be given to the termination of individual and overall shields.
Back shell adapters designed for shield termination, connectors with conductive finishes, and EMI grounding fingers are available for this purpose.
b. Rectangular Connectors. The rectangular connectors are typically used in applications where a very large number of circuits are accommodated in a single mated pair. They are available with a great variety of contacts, which can include a mix of standard, coaxial, and large power types. Coupling is accomplished by various means. Smaller types are secured with screws which hold their flanges together. Larger ones have integral guide pins that ensure correct
Par 11-232 Page 11-106 alignment, or jackscrews that both align and lock the connectors. Rack and panel connectors use integral or rack-mounted pins for alignment and box mounting hardware for couplings.
c. Module Blocks. These junctions accept crimped contacts similar to those on connectors. Some use internal busing to provide a variety of circuit arrangements. They are useful where a number of wires are connected for power or signal distribution. When used as grounding modules, they save and reduce hardware installation on the aircraft. Standardized modules are available with wire end grommet seals for environmental applications and are track-mounted. Function module blocks are used to provide an easily wired package for environment-resistant mounting of small resistors, diodes, filters, and suppression networks.
In-line terminal junctions are sometimes used in lieu of a connector when only a few wires are terminated and when the ability to disconnect the wires is desired. The in-line terminal junction is environment-resistant. The terminal junction splice is small and may be tied to the surface of a wire bundle when approved by the OAM.
FIGURE 11-35. CONNECTOR INFORMATION EXAMPLE MS27480
MIL SPECIFICATION - LPOLARIZATION
CLASS - - CONTACT STYLE
SHELL SIZE- - INSERT ARRANGEMENT
- FINISH MS27472 WALL MOUNT RECEPTACLE MS27473 STRAIGHT PLUG MS27474 JAM NUT RECEPTACLE MS27475 HERMITIC WALL MOUNT RECEPTACLE MS27476 HERMETIC BOX MOUNT RECEPTACLE MS27477 HERMETIC JAM NUT RECEPTACLE MS27478 HERMETIC SOLDER MOUNT RECEPTACLE MS27479 WALL MOUNT RECEPTACLE (NOTE 1) MS27480 STRAIGHT PLUG (NOTE 1) MS27481 JAM NUT RECEPTACLE (NOTE 1) MS27482 HERMETIC WALL MOUNT RECEPTACLE (NOTE 1) MS27483 HERMETIC JAM NUT RECEPTACLE (NOTE 1) MS27484 STRAIGHT PLUG, EMI GROUNDING MS27497 WALL RECEPTACLE, BACK PANEL MOUNTING MS27499 BOX MOUNTING RECEPTACLE MS27500 90° PLUG (NOTE 1) MS27503 HERMETIC SOLDER MOUNT RECEPTACLE (NOTE 1) MS27504 BOX MOUNT RECEPTACLE (NOTE 1) MS27508 BOX MOUNT RECEPTACLE, BACK PANEL
MOUNTING VS27513 BOX MOUNT RECEPTACLE, LONG GROMMET VS27664 WALL MOUNT RECEPTACLE, BACK PANEL MOUNTING (NOTE 1) MS27667 THRU-BULKHEAD RECEPTACLE NOTE 65°C TO +150C° (INACTIVE FOR NEW DESIGN)
1. ACTIVE SUPERSEDES B OLIVE DRAB CADMIUM PLATE OVER SUITABLE MS27472 MS27479 UNDERPLATE (CONDUCTIVE), -65°C TO +175°C MS27473 MS27480 C ANODIC (NONCONDUCTIVE), -65°C TO +175°C MS27474 MS27481 D FUSED TIN, CARBON STEEL (CONDUCTIVE), MS27475 MS27482 -65°C TO 150°C MS27477 MS27483 CORROSION RESISTANT STEEL (CRES), MS27473 WITH MS27500 PASSIVATED (CONDUCTIVE), -65°C TO +200°C MS27507 ELBOW F ELECTROLESS NICKEL COATING (CONDUCTIVE), MS27478 MS27503 -65°C TO +200°C MS27499 MS27504 N HERMETIC SEAL OR ENVIRONMENT RESISTING MS27497 MS27664 CRES (CONDUCTIVE PLATING), -65°C TO +200°C
CLASS CONTACT STYLE
ENVIRONMENT RESISTING-BOX AND THRU- WITHOUT PIN CONTACTS
BULKHEAD MOUNTING TYPES ONLY (SEE CLASS T) WITHOUT SOCKET CONTACTS
POTTING-INCLUDES POTTING FORM AND SHORT FEED THROUGH
REAR GROMMET P PIN CONTACTS-INCLUDING HERMETICS WITH
T ENVIRONMENT RESISTING-WALL AND JAM-NUT SOLDER CUPS
MOUNTING RECEPTACLE AND PLUG TYPES S SOCKET CONTACTS-INCLUDING HERMETICS
THREAD AND TEETH FOR ACCESSORY WITH SOLDER CUPS
ATTACHMENT PIN CONTACTS WITH EYELET (HERMETIC
HERMETICALLY SEALED SOCKET CONTACTS WITH EYELET (HERMETIC
POLARIZATION
FINISH A, B NORMAL-NO LETTER REQUIRED
SILVER TO LIGHT IRIDESCENT YELLOW COLOR CADMIUM PLATE OVER NICKEL (CONDUCTIVE), - C, OR D Par 11-232 Page 11-107
FIGURE 11-36. DIFFERENT TYPES OF CONNECTORS
FACING VIEW
RECEPTACLE PLUG
CABLE BOX
RECEPTACLE RECEPTACLE RECEPTACLE
PIRECEPTACLE
QUICKDISCONNECT STRAIGHT STRAIGHT PLUG
PLUG PLUG PLUG SINGLE
QUADRUPLE INSERT
TRIPLE INSERT PLUG DOUBLE
INSERT RECEPTACLE INSERT
ANGLE PLUG ANGLE PLUG PLUG RECEPTACLE /PLUG
RECEPTACLE
RECEPTACLE PLUG
MS CONNECTOR
TYPICAL RACKAND PANEL CONNECTORS Par 11-232 Page 11-108
FIGURE 11-37. COAX CABLE CONNECTORS
PLUG STRAIGHT FLANGE MOUNT
RECEPTACLE RECEPTACLE ENC Series Connectors
PLUG STRAIGHT FLANGE MOUNT
RECEPTACLE RECEPTACLE TNC Series Connedors
PLUG STRAIGHT FLANGE MOUNT
RECEPTACLE RECEPTACLE N Series Connectors
PLUG STRAIGHT FLANGE MOUNT
RECEPTACLE RECEPTACLE C Series Connectors Par 11-232 Page 11-109
FIGURE 11-37. COAX CABLE CONNECTORS (CONTINUED)
STRAIGHT ANGLE BULKHEAD FLANGE MOUNT
PLUG PLUG RECEPTACLE RECEPTACLE SC Series Connectors
STRAIGHT PLUG STRAIGHT RECEPTACLE FLANGE MOUNT RECEPTACLE SMA Series Connectors
STRAIGHT PLUG ANGLE PLUG STRAIGHT RECEPTACLE JAM NUT RECEPTACLE SMB Series Connectors
STRAIGHT PLUG STRAIGHT RECEPTACLE JAM NUT RECEPTACLE ANGLE PLUG SMC Series Connectors Par 11-232 Page 11-110