AD 80-08-09 R1
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | The Boeing Company | DC-9-11 | Airworthiness Directives; MCDONNELL DOUGLAS DC-9-10, -20, -30, -40, -50 Series Airplanes (including Military C9A, C9B, and VC9C Airplanes) |
| aircraft | The Boeing Company | DC-9-12 | Airworthiness Directives; MCDONNELL DOUGLAS DC-9-10, -20, -30, -40, -50 Series Airplanes (including Military C9A, C9B, and VC9C Airplanes) |
| aircraft | The Boeing Company | DC-9-13 | Airworthiness Directives; MCDONNELL DOUGLAS DC-9-10, -20, -30, -40, -50 Series Airplanes (including Military C9A, C9B, and VC9C Airplanes) |
| aircraft | The Boeing Company | DC-9-14 | Airworthiness Directives; MCDONNELL DOUGLAS DC-9-10, -20, -30, -40, -50 Series Airplanes (including Military C9A, C9B, and VC9C Airplanes) |
| aircraft | The Boeing Company | DC-9-15 | Airworthiness Directives; MCDONNELL DOUGLAS DC-9-10, -20, -30, -40, -50 Series Airplanes (including Military C9A, C9B, and VC9C Airplanes) |
| aircraft | The Boeing Company | DC-9-15F | Airworthiness Directives; MCDONNELL DOUGLAS DC-9-10, -20, -30, -40, -50 Series Airplanes (including Military C9A, C9B, and VC9C Airplanes) |
| aircraft | The Boeing Company | DC-9-21 | Airworthiness Directives; MCDONNELL DOUGLAS DC-9-10, -20, -30, -40, -50 Series Airplanes (including Military C9A, C9B, and VC9C Airplanes) |
| aircraft | The Boeing Company | DC-9-31 | Airworthiness Directives; MCDONNELL DOUGLAS DC-9-10, -20, -30, -40, -50 Series Airplanes (including Military C9A, C9B, and VC9C Airplanes) |
| aircraft | The Boeing Company | DC-9-32 | Airworthiness Directives; MCDONNELL DOUGLAS DC-9-10, -20, -30, -40, -50 Series Airplanes (including Military C9A, C9B, and VC9C Airplanes) |
| aircraft | The Boeing Company | DC-9-32 (VC-9C) | Airworthiness Directives; MCDONNELL DOUGLAS DC-9-10, -20, -30, -40, -50 Series Airplanes (including Military C9A, C9B, and VC9C Airplanes) |
Unsafe Condition
Possible loss of structural integrity of the horizontal stabilizer rear spar due to cracks in the upper and lower rear spar caps.
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Required Actions
Inspect left and right horizontal stabilizer upper and lower rear spar caps using visual and eddy current methods per Service Bulletin A55-31. Address cracks by trimming within limits or replacing parts as specified. Reinspect at intervals based on crack presence and repair history.
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Compliance Time
Within 1,200 hours' additional time in service from the effective date (September 15, 1981) for airplanes with 20,000 to 30,000 hours' total time in service; within 800 hours' additional time in service for those with 30,000+ hours. Subsequent inspections at intervals not exceeding specified hours' time in service.
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Affected Aircraft
McDonnell Douglas DC-9-10, -20, -30, -40, -50 series airplanes including military C9A, C9B, and VC9C models, certificated in all categories.
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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