Airworthiness Directive · Amendment 39-18665 · Doors
The Boeing Company Airplanes
The Boeing Company airplanes, certificated in any category, as identified in paragraphs (c)(1) and (c)(2) of this AD.
(1) Model 707-300, 707-300B, and 707-300C series airplanes, as identified in Boeing 707 Alert Service Bulletin A3536, Revision 1, dated September 16, 2015.
(2) Model 727C, 727-100C, and 727-200F series airplanes, as identified in Boeing Alert Service Bulletin 727-52A0150, Revision 1, dated November 5, 2015.
We are adopting a new airworthiness directive (AD) for certain The Boeing Company Model 707-300, 707-300B, and 707-300C series airplanes; and certain Model 727C, 727-100C, and 727-200F series airplanes. This AD was prompted by a report indicating that a cam latch on the main cargo door (MCD) broke during flight. This AD requires various inspections and related investigative and corrective actions, if necessary. We are issuing this AD to address the unsafe condition on these products.
(1) Except as provided by paragraph (k)(l) of this AD, at the applicable times specified in table 1 of paragraph 1.E., “Compliance,” of Boeing 707 Alert Service Bulletin A3536, Revision 1, dated September 16, 2015 (for Model 707-300, 707-300B, and 707-300C series airplanes); or Boeing Alert Service Bulletin 727-52A0150, Revision 1, dated November 5, 2015 (for Model 727C, 727-100C, and 727-200F series airplanes): Do the actions specified in paragraphs (g)(1)(i) through (g)(1)(iv) of this AD in accordance with the Accomplishment Instructions of Boeing 707 Alert Service Bulletin A3536, Revision 1, dated September 16, 2015 (for Model 707-300, 707-300B, and 707-300C series airplanes); or Boeing Alert Service Bulletin 727-52A0150, Revision 1, dated November 5, 2015 (for Model 727C, 727-100C, and 727-200F series airplanes).
(i) A general visual inspection of the MCD for broken or missing cam latches, latch pins, and latch pin cross bolts.
(ii) Torque the cross bolts in the latch pins.
(iii) Measure the extension of the latch pins.
(iv) Perform a general visual inspection of all cam latches for lip deformation.
(2) Except as required by paragraph (k)(2) of this AD, after accomplishing the actions specified in paragraphs (g)(1)(i) through (g)(1)(iv) of this AD: Do all applicable related investigative and corrective actions, replace all alloy steel cross bolts through the latch pins with corrosion resistant steel (CRES) cross bolts, repeat the applicable inspections, and do the check of the MCD rig and the latch mechanism adjustment test, at the applicable times and intervals specified in table 1 of paragraph 1.E., “Compliance,” and in accordance with the Accomplishment Instructions of Boeing 707 Alert Service Bulletin A3536, Revision 1, dated September 16, 2015 (for Model 707-300, 707-300B, and 707-300C series airplanes); or Boeing Alert Service Bulletin 727-52A0150, Revision 1, dated November 5, 2015 (for Model 727C, 727-100C, and 727-200F series airplanes). Accomplishment of the check of the MCD rig terminates the repetitive inspections required by this paragraph.
(1) Except as required by paragraph (k)(2) of this AD: At the applicable times specified in table 2 of paragraph 1.E., “Compliance,” of Boeing Alert Service Bulletin Boeing 707 Alert Service Bulletin A3536, Revision 1, dated September 16, 2015 (for Model 707-300, 707-300B, and 707-300C series airplanes); or Boeing Alert Service Bulletin 727-52A0150, Revision 1, dated November 5, 2015 (for Model 727C, 727-100C, and 727-200F series airplanes): Do general visual inspections for any broken or missing cam latches, latch pins, and latch pin cross bolts; a detailed inspection of the cam latches and latch pins for any cracks, or any gouges in critical areas; and an HFEC or magnetic particle inspection of cam latch 1 and cam latch 2 for cracks in critical areas; and do all applicable corrective actions; in accordance with the Accomplishment Instructions of Boeing 707 Alert Service Bulletin A3536, Revision 1, dated September 16, 2015 (for Model 707-300, 707-300B, and 707-300C series airplanes); or Boeing Alert Service Bulletin 727-52A0150, Revision 1, dated November 5, 2015 (for Model 727C, 727-100C, and 727-200F series airplanes). Do all applicable corrective actions before further flight.
(2) Repeat the inspections required by paragraph (h)(1) of this AD at the applicable times specified in table 2 of paragraph 1.E., “Compliance,” of Boeing 707 Alert Service Bulletin A3536, Revision 1, dated September 16, 2015 (for Model 707-300, 707-300B, and 707-300C series airplanes); or Boeing Alert Service Bulletin 727-52A0150, Revision 1, dated November 5, 2015 (for Model 727C, 727-100C, and 727-200F series airplanes).
(1) For airplanes identified in Boeing 707 Alert Service Bulletin A3536, Revision 1, dated September 16, 2015: Before or concurrently with accomplishment of the general visual inspections specified in paragraphs (g)(1)(i) and (g)(1)(iv) of this AD, do a general visual inspection of the hinge fittings and the cam latches on the MCD, and perform related investigative and corrective actions as applicable, in accordance with the Accomplishment Instructions of Boeing 707/720 Service Bulletin 3477, Revision 2, dated April 15, 1993.
(2) For airplanes identified in Boeing Alert Service Bulletin 727-52A0150, Revision 1, dated November 5, 2015: Before or concurrently with accomplishment of the general visual inspections specified in paragraphs (g)(1)(i) and (g)(1)(iv) of this AD, do a general visual inspection of the hinge fittings and the cam latches on the MCD, and perform related investigative and corrective actions as applicable, in accordance with the Accomplishment Instructions of Boeing Service Bulletin 727-52-0142, Revision 2, dated April 15, 1993.
