AD 75-05-01

75-05-01 BOEING: Amendment 39-2096 as amended by Amendment 39-2142. Applies to Boeing Models 707/720, 727, 737, and 747 series airplanes categorized as Groups I, II, III, IV and V below, certificated in all categories:

Group I: All Boeing Model 707/720, 727, 737 series airplanes categorized as Group I in Boeing Alert Service Bulletins 3204 (707), Revision 2; 727-27-155, Revision 1; 737-27-1073, Revision 1, or later FAA approved revisions. Only compliance required is with Paragraphs A and B.

Group II: All Boeing Model 707/720 and 727 series airplanes categorized as Group II in Boeing Alert Service Bulletins 3204 (707), Revision 2, and 727-27-155, Revision 1, or later FAA approved revisions. Only compliance required is with Paragraph A and B.

Group III: All Boeing Model 707/720 and 727 series airplanes categorized as Group III in Boeing Alert Service Bulletins 3204 (707), Revision 2, and 727-27-155, Revision 1, or later FAA approved revisions. Only compliancerequired is with Paragraph C.

Group IV: All Boeing Model 707/720, 727 and 737 series airplanes not categorized as Group I, II, or III, which have had pulleys replaced with Arvan Inc./Tansey pulleys MS 20220-3 or -4, or SMS 20220-3 or -4 (color black only) (BAC P30F8 or BAC P30F9). Only compliance required is with Paragraph D.

Group V: All Boeing Model 747 series airplanes categorized in Boeing Service Bulletin 747-27-2133 as having had control cable pulleys in the speed brake system replaced with Arvan Inc./Tansey pulleys BAC P30F8 (color black only). Only compliance required is with Paragraph D for BAC P30F8 pulleys.

A. To detect cracks in Arvan Inc./Tansey control cable pulleys MS 20220-3 and -4 or SMS 20220-3 or -4 (color black only) accomplish the following:

1. Within the next 25 hours time in service from the effective date of this amendment to Amendment 39-2096, unless already accomplished, inspect the control cable pulleys which are located in the critical areas of the airplane in accordance with Boeing Alert Service Bulletins 3204 (707), 727-27- 155, and 737-27-1073, or later FAA approved revision, or in a manner approved by the Chief, Engineering and Manufacturing Branch, FAA Northwest Region. The critical areas are defined in the above Boeing Alert Service Bulletins. 2. If crack(s) are found, replace the pulleys in accordance with the above Boeing Alert Service Bulletins, before further flight. B. Replace all Arvan Inc./Tansey control cable pulleys MS 20220-3 and -4 or SMS 20220-3 or - 4 (color black only) as follows: 1. Within 100 hours time in service from the effective date of this amendment to Amendment 39-2096, unless already accomplished, replace those pulleys located in the critical areas defined in Boeing Alert Service Bulletins 3204 (707), 727-27-155, and 737-27-1073, or later FAA approved revisions. 2. Replace all other affected pulleys within 600 hours from the effective date of this AD, unless already accomplished. C. Within 600 hours time in service from the effective date of this amendment to Amendment 39-2096, unless already accomplished, replace all Arvan Inc./Tansey control cable pulleys MS 20220-3 and -4 or SMS 20220-3 and -4 (color black only) in accordance with Boeing Alert Service Bulletin 3204 (707), Revision 2, and 727-27-155, Revision 1, or later FAA approved revisions. D. Within 1800 hours time in service from the effective date of this amendment to Amendment 39-2096, unless already accomplished, replace all Arvan Inc./Tansey control cable pulleys MS 20220-3 and -4 or SMS 20220-3 and -4 (color black only) with a pulley of the same part number but a different color. New Arvan replacement pulleys are brown in color. E. If it can be shown that a Group II, III, IV, or V airplane has not had any MS 20220-3 or -4, or SMS 20220-3 or -4, or BAC P30F8 or BAC P30F9 pulley replaced since August 16, 1974, then this AD is not applicable to that airplane. The manufacturer's specifications and procedures identified and described in this directive are incorporated herein and made a part hereof pursuant to 5 U.S.C. 552(a)(1). All persons affected by this directive who have not already received these documents from the manufacturer may obtain copies upon request to Boeing Commercial Airplane Company, P. O. Box 3707, Seattle, Washington 98124. The documents may be examined at FAA Northwest Region, 9010 East Marginal Way South, Seattle, Washington.

Amendment 39-2096 became effective February 24, 1975. This amendment 39-2142 becomes effective April 7, 1975.