Airworthiness Directive · Amendment 39-22257 · Wings
The Boeing Company Airplanes
This AD applies to The Boeing Company airplanes specified in paragraphs (c)(1) through (3) of this AD, certificated in any category.
(1) Model 707-100 Long Body, -200, -100B Long Body, and -100B Short Body series airplanes.
(2) Model 707-300, -300B, -300C, and -400 series airplanes.
(3) Model 727, 727C, 727-100, 727-100C, 727-200, and 727-200F series airplanes.
The FAA is adopting a new airworthiness directive (AD) for all The Boeing Company Model 707 and Model 727 airplanes. This AD was prompted by a report indicating cracking in fastener holes at the center wing box and at certain positions of the rear spar and lower skin on a Model 737-300 airplane. A cross model review determined that similar cracking of the fastener holes in the center wing box lower skin could occur on Model 707 and Model 727 airplanes. For Model 707 airplanes this AD requires repetitive detailed inspections of the center wing box lower skin for cracking and repetitive high frequency eddy current (HFEC) and ultrasonic (UT) inspections of the rear spar lower chord at a certain position for cracking, repetitive sealant application, and repair if necessary. For Model 727 airplanes this AD requires repetitive detailed inspections of the center wing box, lower skin, and rear spar lower chord at a certain location for cracking, repetitive sealant application, and repair if necessary. The FAA is issuing this AD to address the unsafe condition on these products.
For airplanes identified as Group 1 in Boeing Alert Requirements Bulletin 727-57A0190 RB, dated September 13, 2021: Within 120 days after the effective date of this AD, inspect the airplane and do all applicable on-condition actions using a method approved in accordance with the procedures specified in paragraph (j) of this AD.
Except as specified by paragraph (i) of this AD: At the applicable times specified in the “Compliance” paragraph of Boeing 707 Alert Requirements Bulletin A3544 RB, dated November 1, 2021; or Boeing Alert Requirements Bulletin 727-57A0190 RB, dated September 13, 2021; as applicable, do all applicable actions identified in, and in accordance with, the Accomplishment Instructions of Boeing 707 Alert Requirements Bulletin A3544 RB, dated November 1, 2021; or Boeing Alert Requirements Bulletin 727-57A0190 RB, dated September 13, 2021, as applicable.
Note 1 to paragraph (h): Guidance for accomplishing the actions required by this AD can be found in Boeing 707 Alert Service Bulletin A3544, dated November 1, 2021, which is referred to in Boeing 707 Alert Requirements Bulletin A3544 RB, dated November 1, 2021; and Boeing Alert Service Bulletin 727-57A0190, dated September 13, 2021, which is referred to in Boeing Alert Requirements Bulletin 727-57A0190 RB, dated September 13, 2021.
(1) Where the Compliance Time columns of the tables in the “Compliance” paragraph of Boeing 707 Alert Requirements Bulletin A3544 RB, dated November 1, 2021, uses the phrase “the original issue date of Requirements Bulletin 707A3544 RB” this AD requires using “the effective date of this AD.”
(2) Where the Compliance Time columns of the tables in the “Compliance” paragraph of Boeing Alert Requirements Bulletin 727-57A0190 RB, dated September 13, 2021, uses the phrase “the original issue date of Requirements Bulletin 727-57A0190 RB” this AD requires using “the effective date of this AD.”
(3) Where Boeing 707 Alert Requirements Bulletin A3544 RB, dated November 1, 2021, specifies contacting Boeing for repair instructions: This AD requires doing the repair using a method approved in accordance with the procedures specified in paragraph (j) of this AD.
(4) Where Boeing Alert Requirements Bulletin 727-57A0190 RB, dated September 13, 2021, specifies contacting Boeing for repair instructions: This AD requires doing the repair using a method approved in accordance with the procedures specified in paragraph (j) of this AD.
