AD 72-09-01
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | The Boeing Company | DC-9-11 | Airworthiness Directives; MCDONNELL DOUGLAS DC-9 Series Airplanes and Military C-9A (DC-9-32F) Airplanes |
| aircraft | The Boeing Company | DC-9-12 | Airworthiness Directives; MCDONNELL DOUGLAS DC-9 Series Airplanes and Military C-9A (DC-9-32F) Airplanes |
| aircraft | The Boeing Company | DC-9-13 | Airworthiness Directives; MCDONNELL DOUGLAS DC-9 Series Airplanes and Military C-9A (DC-9-32F) Airplanes |
| aircraft | The Boeing Company | DC-9-14 | Airworthiness Directives; MCDONNELL DOUGLAS DC-9 Series Airplanes and Military C-9A (DC-9-32F) Airplanes |
| aircraft | The Boeing Company | DC-9-15 | Airworthiness Directives; MCDONNELL DOUGLAS DC-9 Series Airplanes and Military C-9A (DC-9-32F) Airplanes |
| aircraft | The Boeing Company | DC-9-15F | Airworthiness Directives; MCDONNELL DOUGLAS DC-9 Series Airplanes and Military C-9A (DC-9-32F) Airplanes |
| aircraft | The Boeing Company | DC-9-21 | Airworthiness Directives; MCDONNELL DOUGLAS DC-9 Series Airplanes and Military C-9A (DC-9-32F) Airplanes |
| aircraft | The Boeing Company | DC-9-31 | Airworthiness Directives; MCDONNELL DOUGLAS DC-9 Series Airplanes and Military C-9A (DC-9-32F) Airplanes |
| aircraft | The Boeing Company | DC-9-32 | Airworthiness Directives; MCDONNELL DOUGLAS DC-9 Series Airplanes and Military C-9A (DC-9-32F) Airplanes |
| aircraft | The Boeing Company | DC-9-32 (VC-9C) | Airworthiness Directives; MCDONNELL DOUGLAS DC-9 Series Airplanes and Military C-9A (DC-9-32F) Airplanes |
Unsafe Condition
Cracks in the engine mount pylon upper aft spar caps (P/N 9958154-5, -6) and/or titanium straps (P/N 9958154-17, -18) and supporting structure could lead to failure of the engine mount pylon.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Conduct visual inspections for cracks in specified areas of the engine mount pylon and supporting structure. If cracks are found, replace cracked parts with new parts of the same design or approved repairs. Radiographic inspections are required if no cracks are found initially, at intervals not exceeding 1200 hours time in service. Modifications per Douglas Service Bulletins 54-27 or 54-31 may discontinue inspections.
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Compliance Time
Within the next 150 hours time in service after the effective date of this AD, unless already accomplished. For aircraft with over 1200 hours time in service as of the effective date, comply within 150 hours time in service after the effective date or by 1500 total hours time in service, whichever comes first.
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Affected Aircraft
McDonnell Douglas DC-9 series airplanes listed in Service Bulletin No. 54-27 (March 3, 1972 or later FAA-approved revisions) and Military C-9A (DC-9-32F) airplanes.
AI-generated summary from the source AD text. Verify against the official source before acting.
Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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