Airworthiness directives › 2025-04-01
AD 2025-04-01 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 all The Boeing Company Model 737-600, -700, -700C, -800, -900, and -900ER series airplanes, certificated in any category.
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 737-71-1938 RB, Revision 1, dated June 27, 2024, do all applicable actions identified in, and in accordance with, the Accomplishment Instructions of Boeing Special Attention Requirements Bulletin 737-71-1938 RB, Revision 1, dated June 27, 2024. Note 1 to paragraph (g): Guidance for accomplishing the actions required by this AD can be found in Boeing Special Attention Service Bulletin 737-71-1938, Revision 1, dated June 27, 2024, which is referred to in Boeing Special Attention Requirements Bulletin 737-71-1938 RB, Revision 1, dated June 27, 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. In one event, fan cowl parts damaged the fuselage, which caused loss of pressurization and subsequent emergency descent. The FAA is issuing this AD to address inlet cowls that are not strengthened, which, in the event of an FBO occurrence, could depart the airplane potentially damaging the airframe structure, or the inlet cowl could strike the fuselage and window. The unsafe condition, if not addressed, could result in loss of control of the airplane and hazard to window-seated passengers aft of the wing. In addition, the unsafe condition could result in significantly increased drag of the airplane, which during an extended operations (ETOPS) flight, could lead to fuel starvation and a forced off-airplane landing.
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