Airworthiness Directive · Amendment 39-22396 · Ice and rain protection
The Boeing Company Airplanes
This AD applies to all The Boeing Company Model 737-8, -8200, and -9 airplanes, certificated in any category.
The FAA is adopting a new airworthiness directive (AD) for all The Boeing Company Model 737-8, -8200, and -9 airplanes. This AD was prompted by a report indicating that certain engine anti-ice (EAI) exhaust duct fasteners were inadequately torqued. This AD requires an inspection or records review to determine the serial number of each engine inlet; and if any affected engine inlet is found, an inspection of the EAI exhaust duct fasteners to determine the gap spacing and if all fasteners are installed, applicable related investigative and corrective actions, and part marking. This AD also limits the installation of affected parts. The FAA is issuing this AD to address the unsafe condition on these products.
For airplanes with an original airworthiness certificate or original export certificate of airworthiness issued on or before the effective date of the AD: Except as specified by paragraph (h) of this AD, at the applicable times specified in the “Suggested Operator Action” section of Boeing Service Letter 737-SL-71-081-A, Revision A, dated March 3, 2023, do all applicable actions identified as “RC” (required for compliance) in, and in accordance with, the Work Instructions of Boeing Service Letter 737-SL-71-081-A, Revision A, dated March 3, 2023. Perform all applicable related investigative and corrective actions before further flight.
(1) Where the “Suggested Operator Action” section of Boeing Service Letter 737-SL-71-081-A, Revision A, dated March 3, 2023, specifies doing “the following actions within the given time from the publication of this service letter,” this AD requires accomplishing the actions within the specified compliance times after “the effective date of this AD.”
(2) Where the “Suggested Operator Action” section of Boeing Service Letter 737-SL-71-081-A, Revision A, dated March 3, 2023, specifies “corrective actions,” for this AD, those actions include “corrective and related investigative actions.”
(3) A review of airplane maintenance records is acceptable in lieu of the inspection to verify the serial number of the inlet specified in step A.1. of the Work Instructions of Boeing Service Letter 737-SL-71-081-A, Revision A, dated March 3, 2023, if the serial number of the inlet can be conclusively determined from that review.
(4) Where Boeing Service Letter 737-SL-71-081-A, Revision A, dated March 3, 2023, specifies contacting Boeing for repair or further instructions: This AD requires doing the repair and applicable instructions before further flight using a method approved in accordance with the procedures specified in paragraph (l) of this AD.
(5) Where the Work Instructions of Boeing Service Letter 737-SL-71-081-A, Revision A, dated March 3, 2023, refers to the structural repair manual, replace the text “737-8/8200/9 Structural Repair Manual (SRM) 51-40-04, Revision 18/9/15,” with “737-8 Structural Repair Manual (SRM) 51-40-04, Revision 18 or 19; 737-8200 SRM 51-40-04, Revision 9 or 10; or 737-9 SRM 51-40-04, Revision 15 or 16.”
As of the effective date of this AD, no person may install an engine inlet assembly with a serial number listed in Attachment I of Boeing Service Letter 737-SL-71-081-A, Revision A, dated March 3, 2023, on any airplane unless all applicable actions required by paragraph (g) of this AD have been done for that inlet.
The aircraft, engines and makers this AD names, by the model designations in its text. A model listed here may still be outside the AD's serial ranges.
Aircraft
