AD 88-01-04
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | The Boeing Company | DC-9-11 | Airworthiness Directives; MCDONNELL DOUGLAS DC-9-10 through -50 and C-9 (Military) Series Airplanes |
| aircraft | The Boeing Company | DC-9-12 | Airworthiness Directives; MCDONNELL DOUGLAS DC-9-10 through -50 and C-9 (Military) Series Airplanes |
| aircraft | The Boeing Company | DC-9-13 | Airworthiness Directives; MCDONNELL DOUGLAS DC-9-10 through -50 and C-9 (Military) Series Airplanes |
| aircraft | The Boeing Company | DC-9-14 | Airworthiness Directives; MCDONNELL DOUGLAS DC-9-10 through -50 and C-9 (Military) Series Airplanes |
| aircraft | The Boeing Company | DC-9-15 | Airworthiness Directives; MCDONNELL DOUGLAS DC-9-10 through -50 and C-9 (Military) Series Airplanes |
| aircraft | The Boeing Company | DC-9-15F | Airworthiness Directives; MCDONNELL DOUGLAS DC-9-10 through -50 and C-9 (Military) Series Airplanes |
| aircraft | The Boeing Company | DC-9-21 | Airworthiness Directives; MCDONNELL DOUGLAS DC-9-10 through -50 and C-9 (Military) Series Airplanes |
| aircraft | The Boeing Company | DC-9-31 | Airworthiness Directives; MCDONNELL DOUGLAS DC-9-10 through -50 and C-9 (Military) Series Airplanes |
| aircraft | The Boeing Company | DC-9-32 | Airworthiness Directives; MCDONNELL DOUGLAS DC-9-10 through -50 and C-9 (Military) Series Airplanes |
| aircraft | The Boeing Company | DC-9-32 (VC-9C) | Airworthiness Directives; MCDONNELL DOUGLAS DC-9-10 through -50 and C-9 (Military) Series Airplanes |
Unsafe Condition
Fatigue cracking and possible structural failure of the wing rear spar upper and lower tee caps.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Inspect the wing rear spar lower caps near the No. 2 flap hinge attachment bracket per ASB 57-146. If cracks are found, perform additional inspections of the upper cap. Repeat inspections at intervals not exceeding 4,000 landings until preventative modification is done. Repair cracks beyond limits with approved service rework drawings or temporary repairs, followed by ongoing inspections. Install preventative modification per SB 57-146 to terminate AD.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
Within the next 300 landings, within specified initial inspection schedules based on accumulated landings, prior to further flight, or prior to the accumulation of 37,000 landings as applicable.
AI-generated summary from the source AD text. Verify against the official source before acting.
Affected Aircraft
McDonnell Douglas Model DC-9-10 through -50 and C-9 (Military) series airplanes, certificated in any category.
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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