Airworthiness directives › 2025-04-03
AD 2025-04-03 Airworthiness Directives; The Boeing Company Airplanes
Models named: 737-600, -700, -700C, -800, -900, -900ER series. Read the applicability below — it usually turns on serial or part numbers too.
Applicability*9
This AD applies to The Boeing Company Model 737-600, -700, -700C, -800, -900, and -900ER series airplanes identified in Boeing Special Attention Requirements Bulletin 737-78-1106 RB, Revision 1, dated May 23, 2024.
Compliance
Comply with this AD within the compliance times specified, unless already done.
Required actions
Except as specified by paragraph (h) of this AD: At the applicable times specified in the “Compliance” paragraph of Boeing Special Attention Requirements Bulletin 737-78-1106 RB, Revision 1, dated May 23, 2024, do all applicable actions identified in, and in accordance with, the Accomplishment Instructions of Boeing Special Attention Requirements Bulletin 737-78-1106 RB, Revision 1, dated May 23, 2024. Note 1 to paragraph (g): Guidance for accomplishing the actions required by this AD can be found in Boeing Special Attention Service Bulletin 737-78-1106, Revision 1, dated May 23, 2024, which is referred to in Boeing Special Attention Requirements Bulletin 737-78-1106 RB, Revision 1, dated May 23, 2024.
Unsafe condition
This AD was prompted by two engine fan blade-out (FBO) events that resulted in the separation of engine inlet cowl and fan cowl parts from the airplane damaging the fuselage, which caused loss of pressurization and subsequent emergency descent. The FBO events also resulted in cracks in the primary exhaust nozzle, which could result in the departure of the primary exhaust nozzle. The FAA is issuing this AD to address primary exhaust nozzles that are not strengthened, which during an FBO event, could depart the engine, potentially damaging a stabilizer or striking the fuselage and window. The unsafe condition, if not addressed, could result in loss of control of the airplane, or in a rapid decompression and hazard to window-seated passengers aft of the wing.
Affected ADs
None.
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The directive text above is reproduced from the Federal Register, a work of the United States government and in the public domain. The separation into applicability, compliance and required actions is TrackAD's.*1