AD 79-19-02
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | The Boeing Company | DC-9-11 | Airworthiness Directives; MCDONNELL DOUGLAS DC-9 Series C-9A, C-9B and VC-9C |
| aircraft | The Boeing Company | DC-9-12 | Airworthiness Directives; MCDONNELL DOUGLAS DC-9 Series C-9A, C-9B and VC-9C |
| aircraft | The Boeing Company | DC-9-13 | Airworthiness Directives; MCDONNELL DOUGLAS DC-9 Series C-9A, C-9B and VC-9C |
| aircraft | The Boeing Company | DC-9-14 | Airworthiness Directives; MCDONNELL DOUGLAS DC-9 Series C-9A, C-9B and VC-9C |
| aircraft | The Boeing Company | DC-9-15 | Airworthiness Directives; MCDONNELL DOUGLAS DC-9 Series C-9A, C-9B and VC-9C |
| aircraft | The Boeing Company | DC-9-15F | Airworthiness Directives; MCDONNELL DOUGLAS DC-9 Series C-9A, C-9B and VC-9C |
| aircraft | The Boeing Company | DC-9-21 | Airworthiness Directives; MCDONNELL DOUGLAS DC-9 Series C-9A, C-9B and VC-9C |
| aircraft | The Boeing Company | DC-9-31 | Airworthiness Directives; MCDONNELL DOUGLAS DC-9 Series C-9A, C-9B and VC-9C |
| aircraft | The Boeing Company | DC-9-32 | Airworthiness Directives; MCDONNELL DOUGLAS DC-9 Series C-9A, C-9B and VC-9C |
| aircraft | The Boeing Company | DC-9-32 (VC-9C) | Airworthiness Directives; MCDONNELL DOUGLAS DC-9 Series C-9A, C-9B and VC-9C |
Unsafe Condition
Cracks in elevator spars (P/N 9918450-1 or -501) could result in structural failure of the elevator assembly.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Perform X-ray inspection of elevator spars per Service Bulletin 55-28, Rev 4. Repair or replace cracked spars exceeding limits before further flight. Adjust inspection intervals for cracks as specified.
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Compliance Time
Within the next 3400 hours' time-in-service unless already accomplished within the past 200 hours' time-in-service, and thereafter at intervals not to exceed 3600 hours' time-in-service for airplanes with over 5000 hours' time-in-service as of February 13, 1978.
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Affected Aircraft
McDonnell Douglas DC-9 series (models DC-9-11, -12, -13, -14, -15, -15F, -21, -31, -32, etc.), Military Type C-9A, C-9B, VC-9C, serial numbers corresponding to fuselage numbers 1 through 839 per SB 55-28 Rev 4.
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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