AD 2006-26-13 Airworthiness Directives; Boeing Model 707-100 Long Body, -100B Long Body, -100B Short Body, -E3F, -300, -300B, and -300C Series Airplanes; Model 727-100 and -200 Series Airplanes; Model 737-200, -200C, -300, -400, and -500 Series Airplanes; Model 747-100B, 747-200B, 747-200C, 747-200F, 747-300, 747-400, 747-400D, 747SR, and 747SP Series Airplanes; Model 757-200 and 757-200PF Series Airplanes; and

Models named: 707-100 long body, 707-100B long body, 707-100B short body, 707-E3F, 707-300, 707-300B, 707-300C series, 727-100, 727-200 series, 737-200. Read the applicability below — it usually turns on serial or part numbers too.

This AD applies to airplanes, certificated in any category, as identified in Table 1 of this AD; equipped with any observer or attendant seat. Table 1.—Applicability Boeing— As identified in Boeing— (1) Model 707-100 long body, 707-100B long body, 707-100B short body, 707-E3F, 707-300, 707-300B, and 707-300C series airplanes Service Bulletin 3499, Revision 1, dated May 17, 2001. (2) Model 727-100 and 727-200 series airplanes Service Bulletin 727-25-0295, Revision 2, dated February 6, 2003. (3) Model 737-200, 737-200C, 737-300, 737-400, and 737-500 series airplanes Special Attention Service Bulletin 737-25-1412, Revision 3, dated December 2, 2004. (4) Model 747-100B, 747-200B, 747-200C, 747-200F, 747-300, 747-400, 747-400D, 747SR, and 747SP series airplanes Service Bulletin 747-25-3244, Revision 4, dated June 26, 2003. (5) Model 757-200 and 757-200PF series airplanes Service Bulletin 757-25-0223, Revision 1, dated May 17, 2001. (6) Model 767-200 and 767-300 series airplanes Special Attention Service Bulletin 767-25-0288, Revision 3, dated August 1, 2002.

You are responsible for having the actions required by this AD performed within the compliance times specified, unless the actions have already been done. Restatement of the Requirements of AD 2001-24-02 Inspection and Corrective Action (f) For airplanes identified in Table 2 of this AD, excluding airplanes having variable numbers PW001 through PW054 inclusive, PW091, PW092, PW093, and PW094: Within 36 months after January 4, 2002 (the effective date of AD 2001-24-02), do a one-time general visual inspection of the attachment of the shoulder restraint harness of each observer or attendant seat to determine if a C-clip is used in the attachment. Do the inspection according to the applicable service bulletin identified in Table 3 of this AD. If the shoulder harness is looped through the bracket and attached to itself with a C-clip, do paragraph (f)(1) or (f)(2) of this AD. If the inspection required by paragraph (f) of this AD is done after the effective date of this AD, paragraph (f)(1) or (f)(2), if required, must be done before further flight after the inspection required by paragraph (f) of this AD. Table 2.—Applicability of Paragraph (f) of This AD Boeing— As identified in Boeing— Model 707-100 long body, 707-100B long body, 707-100B short body, 707-E3F, 707-300, 707-300B, and 707-300C series airplanes Service Bulletin 3499, Revision 1, dated May 17, 2001. Model 727-100 and 727-200 series airplanes Service Bulletin 727-25-0295, Revision 1, dated May 17, 2001. Model 737-200, -200C, -300, -400, and -500 series airplanes Special Attention Service Bulletin 737-25-1412, Revision 1, dated May 17, 2001. Model 747SR, 747SP, and 747-100B, -200B, -200C, -200F, -300, -400, and -400D series airplanes Service Bulletin 747-25-3244, Revision 1, dated May 17, 2001. Model 757-200 and 757-200PF series airplanes Service Bulletin 757-25-0223, Revision 1, dated May 17, 2001. Model 767-200 and -300 series airplanes Service Bulletin 767-25-0288, Revision 1, dated May 17, 2001. (1) Remove and discard the C-clip, and reattach the shoulder harness to the mounting bracket, according to the service bulletin. Accomplishment of these actions before the effective date of this AD according to the applicable service bulletin version identified in Table 4 of this AD is also acceptable for compliance with the requirements of paragraph (f)(1) of this AD. (2) Install a second C-clip with the clip's opening positioned in the opposite direction of the opening of the existing C-clip, according to the optional method described in Steps 19 and 20 of Figure 1 or 2 of the applicable service bulletin. Restatement of the Requirements of AD 2003-20-08 Inspection and Corrective Action (g) For airplanes identified in paragraphs (c)(4) and (c)(6) of this AD: Within 36 months after October 21, 2003 (the effective date of AD 2003-20-08), do a one-time general visual inspection of the attachment of the shoulder restraint harness of each observer or attendant seat to determine if a C-clip is used in the attachment. Do the inspection according to the applicable service bulletin identified in Table 3 of this AD. If the shoulder harness is looped through the bracket and attached to itself with a C-clip, do paragraph (g)(1) or (g)(2) of this AD. If the inspection required by paragraph (g) of this AD is done after the effective date of this AD, paragraph (g)(1) or (g)(2) of this AD, if required, must be done before further flight after the inspection required by paragraph (g) of this AD. (1) Remove and discard the C-clip, and reattach the shoulder harness to the mounting bracket, according to the service bulletin. Accomplishment of these actions before the effective date of this AD according to the applicable service bulletin version identified in Table 4 of this AD is also acceptable for compliance with the requirements of paragraph (g)(1) of this AD. (2) Install a second C-clip with the clip's opening positioned in the opposite direction of the opening of the existing C-clip, according to the optional method described in Steps 19 and 20 of Figure 1 or 2 of the applicable service bulletin. Acceptable for

This AD results from reports of the shoulder restraint harness of the attendant or observer seat detaching from the mounting bracket. We are issuing this AD to prevent detachment of the shoulder restraint harness of the attendant or observer seat from its mounting bracket during service, which could result in injury to the occupant of the seat.