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AC 43.13-1B CHG 1 9/27/01 nual inspection of the fixed gear, the aircraft should be jacked up to relieve the aircraft weight. The gear struts and wheels should be checked for abnormal play and corrected. a. Old aircraft landing gear that em- ploys a rubber shock (bungee) cord for shock absorption must be inspected for age, fraying of the braided sheath, narrowing (necking) of the cord, and wear at points of contact with the structure and stretch. If the age of the shock cord is near 5 years or more, it is advisable to replace it with a new cord. A cord that shows other defects should be replaced, regardless of age. b. The cord is color-coded to indicate when it was manufactured and to determine the life of the shock cord. According to MIL-C-5651A, the color code for the year of manufacture is repeated in cycles of 5 years. Table 9-1 shows the color of the code thread for each year and quarter year. TABLE 9-1. Bungee cord color codes. ken. The piston section of the strut should be free of nicks, cuts, and rust. e. Air-oil struts should undergo an in- spection similar to that recommended for spring-oleo struts. In addition, the extension of the strut should be checked to see that it conforms to the distance specified by the manufacturer. If an air-oil strut “bottoms”— that is, it is collapsed—the gas charge and hydraulic fluid has been lost from the air chamber. This is probably due to a loose or defective air valve or to defective O-ring seals. CAUTION: Before an air-oil strut is removed or disassembled, the air valve should be opened to make sure that all air pressure is removed. Se- vere injury and/or damage can occur as the result of disassembling a strut when even a small amount of air pres- sure is still in the air chamber. f. The method for checking the fluid level of an air-oil strut is given in the manu- facturer’s maintenance manual. An alternate means of servicing an oil strut is to jack up the aircraft, remove the strut’s valve cap, release the air charge in the strut by depressing the valve core, remove the strut’s valve core, at- tach a clean two-foot rubber or plastic hose to the threaded portion that houses the valve core, and secure with a hose clamp. Put the other end of the hose into a clean two quart con- tainer filled with the correct hydraulic fluid for the strut. Cover the container with a clean rag to prevent spillage. Now, slowly raise the gear/strut assembly either manually or with another jack under the strut. This will drive the remaining air out of the strut into the con- tainer of hydraulic fluid. Once the gear is fully retracted, slowly lower the gear. The hydraulic fluid in the can will be sucked into the strut. Repeat this procedure until you cannot hear any more air bubbles in the container when the wheel strut is fully retracted. With the strut YEARS ENDING WITH 0or5 1or6 2or7 3or8 4or9 COLOR Black Green Red Blue Yellow QUARTER COLOR 1st Red 2nd Blue 3rd Green 4th Yellow 1st Red c. The color coding is composed of threads interwoven in the cotton sheath that holds the strands of rubber cord together. Two spiral threads are used for the year coding and one thread is used for the quarter of the year sheath, e.g. yellow and blue would indicate that the cord was manufactured in 1994 during April, May, or June. d. Shock struts of the spring-oleo type should be examined for leakage, smoothness of operation, looseness between the moving parts, and play at the attaching points. The extension of the struts should be checked to make sure that the springs are not worn or bro- Page 9-2 Par 9-4PDF Image | AFS-640
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