AD 2013-25-12
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Boeing | Company | Airworthiness Directives; The Boeing Company Airplanes |
Unsafe Condition
The fuselage bulkhead web area is subject to widespread fatigue damage (WFD), which could result in fatigue cracking of the bulkhead and reduced structural integrity of the airplane.
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Required Actions
Inspect the aft pressure bulkhead for cracks around the rivet holes. Repair any cracking found. Remove all affected AD4 rivets and install five-leaf doublers with AD5 rivets. Perform either a fluorescent penetrant or eddy current inspection around the rivet holes for cracks.
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Compliance Time
Before the accumulation of 72,000 total flight cycles, or within 18 months after the effective date of this AD, whichever occurs later.
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Affected Aircraft
The Boeing Company Model DC-9-11, DC-9-12, DC-9-13, DC-9-14, DC-9-15, and DC-9-15F airplanes, DC-9-31, DC-9-32, DC-9-32 (VC-9C), DC-9-32F, DC-9-33F, DC-9-34, DC-9-34F, and DC-9-32F (C-9A, C-9B) airplanes, and DC-9-41 airplanes, certificated in any category, identified in McDonnell Douglas DC-9 Alert Service Bulletin A53-144, Revision 2, dated February 23, 1984.
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Source: Official FAA Source ↗
Retrieved: Apr 4, 2026
Rights: U.S. Government Public Domain
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