AD 83-20-04
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | The Boeing Company | DC-6 | Airworthiness Directives; McDONNELL DOUGLAS DC-6, -6A, -6B, R6D (Navy), and C118 (USAF) Series Airplanes |
| aircraft | The Boeing Company | DC-6A | Airworthiness Directives; McDONNELL DOUGLAS DC-6, -6A, -6B, R6D (Navy), and C118 (USAF) Series Airplanes |
| aircraft | The Boeing Company | DC-6B | Airworthiness Directives; McDONNELL DOUGLAS DC-6, -6A, -6B, R6D (Navy), and C118 (USAF) Series Airplanes |
| aircraft | The Boeing Company | Navy R6D-1 | Airworthiness Directives; McDONNELL DOUGLAS DC-6, -6A, -6B, R6D (Navy), and C118 (USAF) Series Airplanes |
| aircraft | The Boeing Company | Navy R6D-1Z | Airworthiness Directives; McDONNELL DOUGLAS DC-6, -6A, -6B, R6D (Navy), and C118 (USAF) Series Airplanes |
| aircraft | The Boeing Company | USAF C-118A | Airworthiness Directives; McDONNELL DOUGLAS DC-6, -6A, -6B, R6D (Navy), and C118 (USAF) Series Airplanes |
Unsafe Condition
Cracks in the horizontal stabilizer rear spar caps attach fittings could lead to failure of the horizontal stabilizer rear spar caps.
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Required Actions
Inspect and repair, if necessary, the horizontal stabilizer upper and lower rear spar cap attach fittings on both sides of station 63 in accordance with Service Rework Drawing J060265. Depending on crack size and location, repairs must be done prior to further flight or at specified intervals (7, 14, or 21 calendar days). Repetitive inspections are required at intervals not exceeding 12 calendar months if no cracks exceeding specified lengths are found.
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Compliance Time
Within the next 30 days after the effective date of this AD, unless already accomplished.
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Affected Aircraft
McDonnell Douglas Model DC-6, -6A, -6B, R6D (Navy), and C118 (USAF) series airplanes, 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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