AD 88-04-01
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | The Boeing Company | DC-6 | Airworthiness Directives; MCDONNELL DOUGLAS DC-6, -6A, -6B, R6D, and C-118A Series Airplanes |
| aircraft | The Boeing Company | DC-6A | Airworthiness Directives; MCDONNELL DOUGLAS DC-6, -6A, -6B, R6D, and C-118A Series Airplanes |
| aircraft | The Boeing Company | DC-6B | Airworthiness Directives; MCDONNELL DOUGLAS DC-6, -6A, -6B, R6D, and C-118A Series Airplanes |
| aircraft | The Boeing Company | Navy R6D-1 | Airworthiness Directives; MCDONNELL DOUGLAS DC-6, -6A, -6B, R6D, and C-118A Series Airplanes |
| aircraft | The Boeing Company | Navy R6D-1Z | Airworthiness Directives; MCDONNELL DOUGLAS DC-6, -6A, -6B, R6D, and C-118A Series Airplanes |
| aircraft | The Boeing Company | USAF C-118A | Airworthiness Directives; MCDONNELL DOUGLAS DC-6, -6A, -6B, R6D, and C-118A Series Airplanes |
Unsafe Condition
Cracks in the vertical stabilizer rear spar attach fittings could lead to failure of the fittings.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Inspect the vertical stabilizer rear spar attach fittings within 3 months after the effective date (March 21, 1988) or within the last 9 months, and thereafter every year or before further flight, whichever is later. Apply LPS-3 corrosion inhibiting oil after each inspection. Replace fittings before further flight if cracks match Service Bulletin 723's paragraph 1, multiple fittings are cracked, or cracks are chordwise. Replace within 3 months or before flight if cracks match Service Bulletin 723's paragraph 2.
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Compliance Time
Within the next 3 months after the effective date of this AD, unless already accomplished within the last 9 months, and thereafter at intervals not to exceed one year or before further flight, whichever occurs later
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Affected Aircraft
McDonnell Douglas Model DC-6, -6A, -6B, R6D, and C-118A series airplanes, certificated in any category
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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