43.13-1A Page 103 72 Copper oval sleeve stock No. Bleeve length Sleove length Cable size Manuni tool No. before com- after com- Number of Tested strength pression (approx.) pression (approx.) presses (pounds) Plain Plated * (Inches) unches 18-11-B4 28-11-B4 51-B4-887 340 18-1-C 28-1-C 51-C-887 550 18-2-G 28-2-G 51-G-887 1, 180 18-3-M 28-3-M 51-M-850 2,300 18-4-P 28-4-P 51-P-850 3, 050 18-0-X 28-6-X 51-X-850 1% 4, 350 18-8-F2 28-8-F2 51-F2-850 1}1⅞ 4 5, 790 18-10-F6 28-10-F6 3-F6-950 1% 1% 7, 180 18-13-G9 28-18-G9 3-G9-950 1⅜ 11, 130 No. 035 HTy.
draulle tool dies 18-23-H5 28-23-H5 Oval H5 1% 16, 800 18-21-J8 28-21-J8 Oval J8 2⅛ 19, 700 18-25-K8 28-25-K8 Oval K8 2½ 25, 200 18-27-M1 | 28-27-M1 Oval M1 2% 31, 025 18-28-N5 28-28-N5 Oval N5 3% 39,200 Tequired on stainless rable.
FIGURE 4.8.- Copper oval sleeve data.
Before undertaking a nicopress splice, determine the proper tool and sleeve for the cable to se used. Refer to figures 4.8 and 4.10 for details on sleeves, tools, and the number of presses required for the various sizes of aircraft cable. The tool must be in good working condition and properly adjusted to assure a satisfactory splice.
To compress a sleeve, have it well centered in the tool groove with the major axis of the sleeve at right angles to the tool. If the sleeve appears to be out of line after the press is started, open the tool, re-center the sleeve, and complete the press.
(1) Thimble-Eye Splice. Initially position the able so that the end will extend slightly berond the sleeve, as the sleeve will elongate omewhat when it is compressed. If the cable and is inside the sleeve, the splice may not hold he full strength of the cable. It is desirable hat the oval sleeve be placed in close proximty to the thimble points, so that when compressed the sleeve will contact the thimble as shown in figure 4.9. The sharp ends of the thimble may be cut off before being used; how- Chap 4 312 FIGURE 4.9.-Typical thimble-eye splice.
ever, make certain the thimble is firmly secured in the cable loop after the splice has been completed. When using a sleeve requiring three compressions, make the center compression first, the compression next to the thimble second, and the one farthest from the thimble
(2) Lap Splice. Lap or running splices may also be made with copper oval sleeves. When making such splices, it is usually necessary to Par 196
Page 104 AC 43.13-1 191 use two sleeves to develop the full strength of the cable. The sleeves should be positioned as shown in figure 4.6b, and the compressions made in the order shown. As in the case of eye sleeve stocksplices, it is desirable to have the cable ends number is extend beyond the sleeves sufficiently to allow atamped here sleeves. for the increased length of the compressed Gauge
(3) Stop Sleeves. Stop sleeves may be used for special cable end and intermediate fittings and they are installed in the same manner as Nicopress oval sleeves.
NoTE: All stop sleeves are plain copper-certain sizes are colored for identification.
(4) Terminal Gauge. To make a satisfactory copper sleeve installation, it is important that the amount of sleeve pressure be kept uniform.
The completed sleeves should be checked periodically with the proper gauge. Hold the gauge so that it contacts the major axis of the sleeve.
The compressed portion at the center of the sleeve should enter the gauge opening with very little clearance, as shown in figure 4.11. If it does not, the tool must be adjusted accordingly.
(5) Other Applications. The preceding information regarding copper oval sleeves and stop sleeves is based on tests made with flexible aircraft cable. The sleeves may also be used on Cable Sleeve Sleeve Tested (Inch) sizo Sleeve No. Tool No. length (Inch) (Inch) O.D. strength (pounds FIGURE 4.11.-Typical terminal gauge.
wire ropes of other constructon if each specifi type of cable is proof tested initially. Becaus of variation in rope strengths, grades, con struction, and actual diameters, the test is nec essary to insure proper selection of materials the correct pressing procedure, and an ade quate margin of safety for the intended use.
197. HAND FABRICATED CABLE ASSEMBLIES.
a. Woven Splice Terminal. The 5-tuck wove splice may be utilized on 7×7 flexible and ×19 extra-flexible cables of 8/82 inch dian ter or greater; however, this type of termina will only develop 75 percent of the cable strength. It should not be used to replace high efficiency terminals unless it is definitely determined the design load for the cable is not greater than 75 percent of the cable minimum breaking strength.
In some cases it will be necessary to splice one end of the cable on assembly. For this reason, investigate the original installation for pulleys and fair-leads that might restrict the passage of the splice. The procedure for the fab- 871-12-B4 51-B4-887 7⅞a 280 rication of a woven splice is as follows.
⅓½: 871-1-C 871-17-J 51-C-887 51-MJ 525 600 (Refer to figure 4.12 for the designation of (Yellow) numbers and letters referred to in this se- 871-18-J 51-MJ Sio 800 quence of operations.)
½a 871-19-M 1% 871-20-M (Red) (Black) 51-MJ 51-MJ Sio 3%¾ 3%% 1, 600 1, 200 thimble, by means of a splicing clamp in a vise, with the free end to the left of the standing (1) Secure the cables around a bushing or ½2 871-22-M 51-MJ | 2, 300 wire and away from the operator. If a thimble 871-26-F6 871-23-16 3-F6-950 3-F6-950 3, 800 3, 500 is used as the end fitting, turn to point outward approximately 45°.
NoTE: All stop sleeves are plain copper--certain sizes are colored for identification.
FIGURE 4.10.-Copper stop sleeve data.
12) Select the free strand (1) nearest the standing length at the end of the fitting, and free this strand from the rest of the free ends.
Next, insert a marlinspike under the first three Par 196 Chap 4
-TEMPORARY SERVING CORD
- SEAM TIGEONE AND WATERPAOOF
- 5 FULL TUCKS - → ‡= FIGURE 4.12.--Preparation of a woven cable splice.
strands (A, B, and C) of the standing length nearest the separated strand of the free end und separate them momentarily by twisting he marlinspike. Insert the free strand (1) inder the three separated strands, through the ›pening created by the marlinspike. Pull the free end taut by means of pliers.
(3) Unlay a second strand (2), located to the left of the first strand tucked, and insert this second strand under the first two standing strands (A, B). Loosen the third free length
(8), located to the left of the first two, and insert it under the first standing strand (A) of the original three (section AA).
(4) Remove the center or core strand (7) from the free end and insert it under the same standing strands (A, B). Temporarily secure the core strand to the body of the standing cable. Loosen the last free strand (6) located just to the right of the first (1) and tuck it under the last two strands (E, F) of the standing cable. Tuck the free strand (5) around standing strand (E). Tuck the free end (4) around the sixth standing strand (F) (see figure 4.12 section AA). Pull all strands snug Chap 4 Page 105 toward the end fitting with the pliers, This completes the first tuck.
(5) Begin with the firat free strand (1) and work in a counterclockwise direction, tucking free strands under every other strand. After the completion of every tuck, pull the strands tight with pliers toward the end fitting. After the completion of the third complete tuck, cut in half the number of wires in each free strand. Make another complete tuck with the wires remaining. At the completion of the fourth tuck, again halve the number of wires in the free strands and make one final tuck with the wires remaining. Cut off all protruding strands and pound the splice with a wooden or rawhide mallet to relieve the strands in the wires.
(6) Serve the splice with waxed linen cord.
Start 1/4 inch from the end of the splice and carry the wrapping over the loose end of the cord and along the tapered splice to a point between the second and third tucks. Insert the end of the cord back through the last five wrappings and pull snug. Cut off the end, and if a thimble is used as an end fitting, bend down the points. Apply two coats of waterproofing to the cord, allowing two hours between coats. Carefully inspect the cable strands and splices for local failure. Weakness in a woven splice is made evident by a separation of the strand of serving cord.
b. Wrap-Soldered Terminal. The wrap-soldered splice terminal shown in figure 4.13 may be utilized on flexible cables less than 8/32 inch in diameter and on nonflexible single strand (19 wire) cable. This type of terminal will develop only 90 percent of the cable strength and should not be used to replace high efficiency terminals, unless it is definitely known that the design load for the cable is not greater than 90 percent of the cable minimum breaking strength. The method of making the wrapped and soldered splice is as follows.
(l) Use serving or wrapping wire made of commercial soft-annealed steel wire or commercial soft iron wire, thoroughly and smoothly tinned or galvanized.
(2) Use half tin and half lead solder conforming to Federal Specification QQ-S-571.
Par 197
Page 106 AC 43.13 The melting point of this solder varies from 320° to 890° F., and the tensile strength is approximately 5,700 pounds per square inch.
(3) Use solder flux consisting of stearic acid (there should be no mineral acid present) and resin, with a composition of 25 to 50 percent resin. A warming gluepot to keep the flux in fluid state is desirable.
(4) Before the cable is cut, solder the wires to prevent slipping. The preferred process is to tin and solder the cable thoroughly two to three inches by placing in a solder trough, finishing smooth with a soldering tool. The cable may be cut diagonally to conform to the required taper finish.
(5) After being soldered and cut, the cable is securely bent around the proper size thimble, and clamped so that the cables lie close and fiat and the taper end for finish lies on the outside. If it is necessary to trim the taper at this point in the process, it is preferable that it be done by nipping. Grinding is permissible, provided a steel guard at least 3 inches long and 1/82 inch thick is placed between the taper end and the main cable during the operation; and that the heat generated from 1 grinding does not melt the solder and loos the wires.
(6) Serving may be done by hand or n chine, but in either case each serving convo tion must touch the adjoining one and pulled tightly against the cable, with spa for permitting a free flow of solder and insp tion. (See figure 4.13a.)
(7) Prevent drawing of the temper of a cable resulting from excessive temperature duration of applied heat. Use a soldering fil consisting of stearic acid and resin. The use, a flux, of sal-ammoniac or any other compou:
having a corrosive effect is not acceptable.
(8) Soldering is accomplished by immersi the terminal alternately in the flux and in t solder bath, repeating the operation until tho ough tinning and filling with solder under tl serving wire and thimble is obtained. The ter perature of the solder bath and place whe:
terminal is withdrawn should not be abo 450° I. A soldering iron may be used in th final operation to give a secure and good-a] pearing terminal. Assure that the solder con pletely fills the space under the serving wil and thimble. A slightly hollowed cast-irc block to support the splice during solderin may help in securing the best results. The us of abrasive wheels or files for removing exce:
solder is not recommended.
(9) As an alternative process for makin terminals for nonflexible cable, the oxyacety
(a) Soldered de arrested cable lene cutting method and the presolderin method (soldering before wrapping) are ac ceptable, but only under the following condi tions:
(a) that the process of cutting securel;
(b) Soldered & wripped table terestal with burblay welds all wires together;
D (b) that the annealing of the cable doe 3/33 3-1/4 3/4 Plus or minus 1/39" 5/8 1/8 .020 i Thimble (A) Bashing (B) AN-100-3 Specification No A24-111-3 the end, not extend more than one cable diameter fron 3/4 3/4 1/8 0035 025 58 AN-100-1 AN-100-9 AN-1114 AN-111-5 (c) that no filing is done either before o 1/23 35/9 1-9/0 1-1/0 1-7/4 1-1/₴ 3710 025 005 109" AN-100-0 AH-100-7 AN-111-8 AN-111-7 after soldering;
41/2 1-1/2 1-1/4 1-14 035 159- AN-1008 AN-111-3 3/16 5-1/4 13/4 170 1/4 050 195 AN-100-10 AN-111-10 (d) that for protection during the opera 21/4 AN-100-18 AN-111-18 212 050 AN-100-14 tion of grinding the tapered end of the cable, & 25701 DISO AH-100 16 steel guard at least three inches in length and FIGURE 4.18.-Preparation of a wrapped soldered 1/82 inch thick should be placed between the terminal. taper and the main cable;
Pur 197 Chap 4
AC 43,13-1A 1972
(e) that heat from grinding does not draw the temper of the cable.
(10) Do not use wrap-soldered splice terminals ahead of the firewall, or in other fre zones, or in other locations where they might be subjected to high temperature.
198. CABLE SYSTEM INSPECTION. Aircraft cable aystems are subject to a variety of environmental conditions and forms of deterioration that ultimately may be easy to recognize as wire/strand breakage or the not-so-readily visible types of wear, corrosion, and/or distortion.
The following data will aid in detecting the presence of these conditions:
a. Cable Damage. Critical areas for wire breakage are those sections of the cable which pass through fairleads and around pulleys. Examine cables for broken wires by passing a cloth along the length of the cable. This will lean the cable for a visual inspection, and decet broken wires if the cloth snags on the able. When snags are found, closely examine e cable to determine the full extent of the mage.
he absence of snags is not positive evidence at broken wires do not exist. Figure 4.14a wows a cable with broken wires that were not detected by wiping, but were found during a visual inspection. The damage became readily FIGURE 4.14.- Cable inspection technique.
Chap 4 Page 107 apparent (figure 4.14b) when the cable was removed and bent using the technique depicted in figure 4.14c.
NOTE: Tests by various aeronautical agencies have indicated that a few broken wires spread over the length of a cable will not result in a critical loss of strength.
Obtain specific information regarding acceptable wire breakage limits from the manufacturer of the aircraft involved.
(I) External Wear Patterns. Wear will normally extend along the cable equal to the distance the cable moves at that location and may occur on one side of the cable only or on its entire circumference. Replace flexible and nonflexible cables when the individual wires in each strand appear to blend together (outer INDIVIDUAL OUTER WIRES WORN MORE THAN 50% INDIVIDUAL OUTER WIRES WORN 40-50% (NOTE BLENDING OF WORN AREAS) INDIVIDUAL OUTER WIRES WORN LESS THAN 40% (WORN AREAS INDIVIDUALLY DISTINGUISHABLE ) FIGURE 4.15.-Cable wear patterns.
Par 197
FIGURE 4.16.-Worn cable (replacement necessary).
wires worn 40-50 percent) as depicted in figure 4.15. Actual instances of cable wear beyond the recommended replacement point are shown in figures 4.16 and 4.17.
(2) Internal Cable Wear. As wear is taking place on the exterior surface of a cable, the same condition is taking place internally, particularly in the sections of the cable which pass over pulleys and quadrants. This condition (shown in figure 4.18) is not easily detected unless the strands of the cable are separated.
Wear of this type is a result of the relative motion between inner wire surfaces. Under certain conditions the rate of this type wear can be greater than that occurring on the surface.
(3) Corrosion. Carefully examine any cable FIGURE 4.17.- Worn cable (replacement recommended).
Par 198 AC 43.13-1A 1972 FIGURE 4.18.--Internal cable wear.
for corrosion that has a broken wire in a section not in contact with wear producing airframe components such as pulleys, fairleads, etc. It may be necessary to remove and bend the cable to properly inspect it for internal strand corrosion as this condition is usually not evident on the outer surface of the cable.
Replace cable segments if internal strand rust or corrosion is found.
Areas especially conducive to cable corrosion are battery compartments, lavatories, wheel wells, etc., where concentrations of corrosive fumes, vapors, and liquids can accumulate.
NOTE: Check all exposed sections of cable for corrosion after a cleaning and/or metal-brightening operation has been accomplished in that area.
An example of cable corrosion, attributable to battery acid, is shown in figure 4.19.
b. Wire Splices. Standard manufacturing splices have been mistaken for defects in the cable because individual wire end splices were Chap 4
AC 43.13-1A 1972 FIGURE 4.19.-Corrosion.
WIRE SF
DIE MARKS FIGURE 4.20.--Manufacturer's wire splice.
visible after assembly of a finished cable length. In some instances, the process of twisting outer strands around the core strand may also slightly flatten individual outer wires, particularly in the area of a wire splice. This flattening is the result of die sizing the cable and does not affect the strength of the cable.
These conditions, as shown in figure 4.20, are normal and are not a cause for cable rejection.
c. Cable Maintenance. Frequent inspections and preservation measures such as rust prevention treatments for bare cable areas will help to extend cable service life. Where cables pass through fairleads, pressure seals, or over pulleys, remove accumulated heavy coatings of corrosion prevention compound. Provide corrosion protection for these cable sections by lubricating with a light coat of graphite grease or general purpose, low-temperature oil.
Chap 4 Page 109
CAUTION Avoid the use of vapor degreasing, steam cleaning, methylethylketone (MEK) or other solvents to remove corrosion-preventative compounds, as these methods will also remove the cable internal lubricant.
d. Routing. Examine cable runs for incorrect routing, fraying, twisting, or wear at fairleads, pulleys, anti-abrasion strips, and guards. Look for interference with adjacent structure, equipment, wiring, plumbing, and other controls. Inspect cable systems for binding, full travel, and security of attaching hardware.
Check for slack in the cable system by attempting to move the control column and/or pedals while the gust locks are installed on the control surfaces. With the gust locks removed, actuate the controls and check for friction or hard movement. These are indications that excessive cable tension exists.
NoTE: If the control movement is stiff after maintenance operations are performed on control surfaces, check for parallel cables twisted around each other or cables connected in reverse.
e. Cable Fittings. Check swaged treminal reference marks for an indication of cable slippage within the fitting. Inspect the fitting assembly for distortion and/or broken strands at the terminal. Assure that all bearings and swivel fittings (bolted or pinned) pivot freely to prevent binding and subsequent failure.
Check turnbuckles for proper thread exposure and broken or missing safety wires/clips.
f. Pulleys. Inspect pulleys for roughness, sharp edges, and presence of foreign material embedded in the grooves. Examine pulley bearings to assure proper lubrication, smooth rotation, freedom from flat spots, dirt, and paint spray. Periodically rotate pulleys, which turn through a small arc, to provide a new bearing surface for the cable. Maintain pulley alignment to prevent the cable from riding on the flanges and chafing against guards, covers, or adjacent structure. Check all pulley brackets and guards for damage, alignment, and security.
(1) Pulley Wear Patterns. Various cable system malfunctions may be detected by analyzing pulley conditions. These include such discrepan- Par 198
Page 110 AC 43,13-1/ 1971
EXCESSIVE CABLE TENSION PULLEY MISALIGNMENT
PULLEY TOO LARGE FOR CABLE CABLE MISALIGNMENT
FROZEN BEARING MORMAL CONDITION FIGURE 4.21.-Pulley wear patterns.
cies as too much tension, misalignment, pulley bearing problems, and size mismatches between cables and pulleys. Examples of these conditions are shown in figure 4.21.
g. Fairleads, Guides, Anti-Abrasion Strips. Inspect fairleads for wear, breakage, alignment, cleanness, and security. Examine cable routing at fairleads to assure that deflection angles are no greater than 3° maximum. Determine that all guides and anti-abrasion strips are secure and in good condition.
h. Pressure Seals and Seal Guards, Examine pressure seals for wear and/or material deterioration. Determine that the seal guards are positioned to prevent jamming of a pulley if a pressure seal fails and pieces slide along the
199. CABLE TENSION ADJUSTMENT. Carefully adjust control cable tension in accordance with the airframe manufacturer's recommendations.
Par 198 On large aircraft, take the temperature of the immediate area into consideration when using a tensiometer. For long cable sections, use the average of two or three temperature readings to obtain accurate tension values. If necessary, compensate for extreme surface temperature variations that may be encountered if the aircraft is operated primarily in unusual geographic or climatic conditions such as arctic, arid, or tropic locations.
Use rigging pins and gust locks as necessary to assure satsifactory results. At the completion of rigging operations, check turnbuckle adjustment and safetying in accordance with Section 2 of this chapter.
200. CORROSION AND RUST PREVENTION. To insure a satisfactory service life for aircraft control cables, use a cable lubricant to reduce internal friction and prevent corrosion. Loose rust and surface corrosion may be removed with a stainless steel brush, being careful not Chap &
AC 43.19-1А Page 111 1972 to damage the cable. Care should be taken to remove all residue from the cable strands prior to rust prevention treatment. If the cable is made from tinned steel, coat the cable with rust preventive oil and wipe off any excess. It should be noted that corrosion-resistant steel cable does not require this treatment for rust prevention.
201.-211. RESERVED.
Chap 4 Par 200
Page 112 AC 43.13-1A 1972 Section 2. SAFETY METHODS FOR TURNBUCKLES
212. GENERAL. Safety all turnbuckles with safety wire using either the double or single wrap method, or with any appropriately approved special safetying device complying with the requirements of FAA Technical Standard Order TSO-C21. The swaged and unswaged turnbuckle assemblies are covered by AN Standard Drawings. For safety wire sizes and materials, refer to figure 4.22. Do not reuse safety wire. Adjust the turnbuckle to the correct cable tension so that no more than three threads are exposed on either side of the turnbuckle barrel. Do not lubricate turnbuckles.
213. DOUBLE WRAP METHOD. O1 the methods using safety wire for safetying turnbuckles, the method described here is preferred, although either of the other methods described is satisfactory. The method of double wrap safetying is shown in figure 4.23(A). Use two separate lengths of the proper wire (see figure
4.22). Run one end of the wire through the hole in the barrel of the turnbuckle and bend the end of the wire towards opposite ends of the turnbuckle. Then pass the second length of the wire into the hole in the barrel and bend the ends along the barrel on the side opposite the first. Spiral the two wires in opposite directions around the barrel to cross each other twice between the center hole and the ends.
Then paas the wires at the end of the turnbuckle in opposite directions through the holes in the turnbuckle eyes or between the jaws of the turnbuckle fork, as applicable, laying one wire along the barrel and wrapping the other at least four times around the shank of the turnbuckle and binding the laid wires in place be fore cutting the wrapped wire off. Wrap th remaining length of safety wire at least for turns around the shank and cut it off. Repe.
the procedure at the opposite end of the turi buckle.
When a swaged terminal is being safetied, pass Cable size Type of wrap Diameter of safety wire Material (ennes ed condition) the ends of both wires, if possible, through the hole provided in the terminal for this purpose and wrap both ends around the shank as de- 710- - Single_ 0.040_. Copper, brass.' Single.. 0.040. Copper, brass.! scribed above. When the hole in the terminal is %- - Single.. 0.040_. Stainless steel, not large enough to accommodate the ends of Monel and both wires, the hole may be enlarged in accord- 'K" Monel. ance with note 2 of figure 4.22 and the safety- %- %- - Single. Double. 0.057 min 0.040- Copper, brass,! Copper, brass.! ing completed as described above. If the hole is %e and Double 0.040_ Stainless steel, not large enough to allow passage of both greater. Monel and wires, pass the wire through the hole and loop 'K" Monel,' it over the free end of the other wire, and then %% and Singie_. 0.057 min.. Stainless steel, wrap both ends around the shank as described.
greater. Monel or "K" Monel.' %% and Double_ 0.051 * Copper, braas. a. Another satisfactory double wrap method greater. is similar to the above, except that the spiraling of the wires is omitted as shown in figure I Galvanized or tinned steel, or soft tron wires are also acceptable. 4.28 (B).
• The safety wire holes in ⅜s-inch diameter and larger turnbuokle terminals for swaging may be drilled auficiently to accommodate the double 0.051-Inch b. The wrapping procedures described and dlameter copper or brass wires when used. shown on MS 38591 may be used in lieu of the FIGURE 4.22-Turnbuckle safetying guide. safetying method shown herein.
Par 212 Chap &
43.13-1A Page 113 71 4 TURN (MIN)
THIS APPLIES TO ALL
TURNBUCKLE WRAPPINGS (A) DOUBLE WRAP (SPIRAL) (B) DOUBLE WRAP SMENKE (C) SINGLE WRAP (SPIRAL) (D) SINGLE WRAP FIGURE 4.23.--Safetying turnbuckles.
Chap 4 Par 219
214. SINGLE WRAP METHOD, The single wrap methods described in the following paragraphs and as illustrated in figures 4.28 (C) and (D) are acceptable but are not the equal of the double wrap methods.
a. Pass a single length of wire through the cable eye or fork, or through the hole in the swaged terminal at either end of the turnbuckle assembly. Spiral each of the wire ends in opposite directions around the first half of the turnbuckle barrel so as to cross each other twice. Thread both wire ends through the hole in the middle of the barrel so that the third crossing of the wire ends is in the hole. Again, spiral the two wire ends in opposite directions around the remaining half of the turnbuckle, crossing them twice. Then, pass one wire end through the cable eye or fork or through the hole in the swaged terminals, in the manner described above, wrap both wire ends around the shank for at least four turns each, cutting off ====:
AC 43.13-1 197 excess wire. This method is shown in figure
4.28 (C).
b. Pass one length of wire through the center hole of the turnbuckle and bend the wire ends toward opposite ends of the turnbuckle. Then pass each wire end through the cable eye or fork, or through the hole in the swaged terminal and wrap each wire end around the shank for at least four turns, cutting off excess wire.
This method is shown in figure 4.23 (D). After safetying, no more than three threads of the turnbuckle threaded terminal should be exposed.
215. SPECIAL LOCKING DEVICES. Several turnbuckle locking devices are available for securing turnbuckle barrels. Persons intending to use a special device must assure the turnbuckle assembly has been designed to accommodate such device. A typical unit is shown in figure
4.24. When special locking devices are nof readily available, the use of safety wire is acceptable.
E==
TURNBUCKLE BODY -LOCKING CLIP MS21251 MS2I256
CLIP TYPE LOCKING DEVICE FIGURE 4.24.- Clip type locking device.
216.-226. RESERVED.
Par 214 Chap &