AD 80-06-04 R1
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | The Boeing Company | DC-9-11 | Airworthiness Directives; MCDONNELL DOUGLAS DC-9-10 through -40 and (Military) C-9 Series Aircraft |
| aircraft | The Boeing Company | DC-9-12 | Airworthiness Directives; MCDONNELL DOUGLAS DC-9-10 through -40 and (Military) C-9 Series Aircraft |
| aircraft | The Boeing Company | DC-9-13 | Airworthiness Directives; MCDONNELL DOUGLAS DC-9-10 through -40 and (Military) C-9 Series Aircraft |
| aircraft | The Boeing Company | DC-9-14 | Airworthiness Directives; MCDONNELL DOUGLAS DC-9-10 through -40 and (Military) C-9 Series Aircraft |
| aircraft | The Boeing Company | DC-9-15 | Airworthiness Directives; MCDONNELL DOUGLAS DC-9-10 through -40 and (Military) C-9 Series Aircraft |
| aircraft | The Boeing Company | DC-9-15F | Airworthiness Directives; MCDONNELL DOUGLAS DC-9-10 through -40 and (Military) C-9 Series Aircraft |
| aircraft | The Boeing Company | DC-9-21 | Airworthiness Directives; MCDONNELL DOUGLAS DC-9-10 through -40 and (Military) C-9 Series Aircraft |
| aircraft | The Boeing Company | DC-9-31 | Airworthiness Directives; MCDONNELL DOUGLAS DC-9-10 through -40 and (Military) C-9 Series Aircraft |
| aircraft | The Boeing Company | DC-9-32 | Airworthiness Directives; MCDONNELL DOUGLAS DC-9-10 through -40 and (Military) C-9 Series Aircraft |
| aircraft | The Boeing Company | DC-9-32 (VC-9C) | Airworthiness Directives; MCDONNELL DOUGLAS DC-9-10 through -40 and (Military) C-9 Series Aircraft |
Unsafe Condition
Cracks in main landing gear attach fittings made from 7079-T6 materials (P/Ns 5911258, 5919289, 5924841) could lead to fitting failure.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Inspect fittings per SB 57-125 R4 within specified timeframes (1,000 hours/125 days, 3,200 hours/375 days, or 6,400 hours/750 days) based on airplane F/N ranges. Replace fittings or rework cracks as specified if found. Repetitive inspections or modifications may be required until terminating action with new 7075-T73 fittings.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
Within the next 1,000 hours time in service or 125 calendar days, whichever comes first, after the effective date of this AD (October 14, 1984) for applicable F/N ranges. Compliance required as indicated for each paragraph (a), (b), (c), (d).
AI-generated summary from the source AD text. Verify against the official source before acting.
Affected Aircraft
MCDONNELL DOUGLAS DC-9-10 through -40 and (Military) C-9 series aircraft corresponding to factory serial numbers listed in SB 57-125 R4, excluding those modified per Option I of SB 57-125 original issue.
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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