Airworthiness Directive · Amendment 39-19789 · Fuselage
The Boeing Company Airplanes
Superseded. A later AD replaced this one: AD 2021-09-06. Comply with the one in force.
This AD applies to all The Boeing Company Model 737-600, -700, -700C, -800, -900, and -900ER series airplanes, certificated in any category.
The FAA is superseding Airworthiness Directive (AD) 2019-20- 02, which applied to all The Boeing Company Model 737-600, -700, -700C, -800, -900, and -900ER series airplanes. AD 2019-20-02 required repetitive inspections for cracking of the left- and right-hand side outboard chords of frame fittings and failsafe straps at a certain station around two fasteners, and repair if any cracking is found. This AD also requires repetitive inspections for cracking of the left- and right-hand side outboard chords of frame fittings and failsafe straps at a certain station, but expands the inspection to the area around eight fasteners, and also requires repair if any cracking is found. This AD was prompted by a determination that the inspection area needs to be expanded. The FAA is issuing this AD to address the unsafe condition on these products.
This paragraph restates the requirements of paragraph (g) of AD 2019-20-02, with no changes. At the earlier of the times specified in paragraphs (g)(1) and (2) of this AD: Do a detailed inspection for cracking of the left- and right-hand side outboard chords of the STA 663.75 frame fittings and failsafe straps adjacent to the stringer S-18A straps, in accordance with Boeing Multi-Operator Message MOM-MOM-19-0536-01B, dated September 30, 2019. If any crack is found, repair before further flight using a method approved in accordance with the procedures specified in paragraph (n) of this AD. Repeat the inspection thereafter at intervals not to exceed 3,500 flight cycles until the initial inspection required by paragraph (i) of this AD is done.
(1) Prior to the accumulation of 30,000 total flight cycles, or within 7 days after October 3, 2019 (the effective date of AD 2019-20-02), whichever occurs later.
(2) Prior to the accumulation of 22,600 total flight cycles, or within 1,000 flight cycles after October 3, 2019 (the effective date of AD 2019-20-02), whichever occurs later.
This paragraph restates the requirements of paragraph (h) of AD 2019-20-02, with no changes. At the applicable time specified in paragraph (h)(1) or (2) of this AD, submit a report of all findings, positive and negative, of the initial inspection required by paragraph (g) of this AD. Submit the report in accordance with Boeing Multi-Operator Message MOM-MOM-19-0536-01B, dated September 30, 2019.
(1) If the inspection was done on or after October 3, 3019 (the effective date of AD 2019-20-02): Submit the report within 3 days after the inspection.
(2) If the inspection was done before October 3, 2019 (the effective date of AD 2019-20-02): Submit the report within 3 days after October 3, 2019.
Except as specified in paragraph (j) of this AD: At the applicable initial compliance time specified in Table 1 of “Ref F” of Boeing Multi-Operator Message MOM-MOM-19-0623-01B, dated November 5, 2019, do a detailed inspection of the left- and right-hand side outboard chords of the STA 663.75 frame fittings and failsafe straps around eight fasteners adjacent to the stringer S-18A straps, in accordance with Boeing Multi-Operator Message MOM-MOM-19-0623-01B, dated November 5, 2019. If any crack is found, repair before further flight using a method approved in accordance with the procedures specified in paragraph (n) of this AD. Repeat the inspection thereafter at the intervals specified in Table 1 of “Ref F” of Boeing Multi-Operator Message MOM-MOM-19-0623-01B, dated November 5, 2019. Accomplishing the initial inspection required by this paragraph terminates the inspections required by paragraph (g) of this AD.
Where Table 1 of “Ref F” of Boeing Multi-Operator Message MOM-MOM-19-0623-01B, dated November 5, 2019, uses the phrase “the original issue date of MOM-MOM-19-0623-01B,” this AD requires using “the effective date of this AD.”
At the applicable time specified in paragraph (k)(1) or (2) of this AD, submit a report of all findings, positive and negative, of the initial inspection required by paragraph (i) of this AD. Submit the report in accordance with Boeing Multi-Operator Message MOM-MOM-19-0623-01B, dated November 5, 2019.
(1) If the inspection was done on or after the effective date of this AD: Submit the report within 3 days after the inspection.
(2) If the inspection was done before the effective date of this AD: Submit the report within 3 days after the effective date of this AD.
