AD 79-10-13
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | The Boeing Company | DC-9-11 | Airworthiness Directives; MCDONNELL DOUGLAS DC-9 Series and Military C-9 Series Airplanes |
| aircraft | The Boeing Company | DC-9-12 | Airworthiness Directives; MCDONNELL DOUGLAS DC-9 Series and Military C-9 Series Airplanes |
| aircraft | The Boeing Company | DC-9-13 | Airworthiness Directives; MCDONNELL DOUGLAS DC-9 Series and Military C-9 Series Airplanes |
| aircraft | The Boeing Company | DC-9-14 | Airworthiness Directives; MCDONNELL DOUGLAS DC-9 Series and Military C-9 Series Airplanes |
| aircraft | The Boeing Company | DC-9-15 | Airworthiness Directives; MCDONNELL DOUGLAS DC-9 Series and Military C-9 Series Airplanes |
| aircraft | The Boeing Company | DC-9-15F | Airworthiness Directives; MCDONNELL DOUGLAS DC-9 Series and Military C-9 Series Airplanes |
| aircraft | The Boeing Company | DC-9-21 | Airworthiness Directives; MCDONNELL DOUGLAS DC-9 Series and Military C-9 Series Airplanes |
| aircraft | The Boeing Company | DC-9-31 | Airworthiness Directives; MCDONNELL DOUGLAS DC-9 Series and Military C-9 Series Airplanes |
| aircraft | The Boeing Company | DC-9-32 | Airworthiness Directives; MCDONNELL DOUGLAS DC-9 Series and Military C-9 Series Airplanes |
| aircraft | The Boeing Company | DC-9-32 (VC-9C) | Airworthiness Directives; MCDONNELL DOUGLAS DC-9 Series and Military C-9 Series Airplanes |
Unsafe Condition
Fatigue cracks in the forward passenger entry door lock mechanism crank assembly parts, P/N 4918613-3 (crank) and P/N 4918613-5 (clevis), could result from riding on unserrated surfaces of mating parts, leading to door lock failure.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Inspect crank assembly P/N 4918613-1 for proper serration engagement before disassembly. Perform dye penetrant inspections on P/N 4918613-3 and -5 parts per Service Bulletin 52-111. Replace cracked parts or those with serration misalignment with unmodified, modified, or new parts as specified in paragraphs (c)(1)(i)-(iii).
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
Within the next 3,500 landings after the effective date of this AD, or before accumulating 22,500 total landings whichever occurs later
AI-generated summary from the source AD text. Verify against the official source before acting.
Affected Aircraft
MCDONNELL DOUGLAS DC-9 Series (models DC-9-11, DC-9-12, DC-9-13, DC-9-14, DC-9-15, DC-9-15F, DC-9-21, DC-9-31, DC-9-32, etc.) and Military C-9 Series airplanes, certificated in all categories.
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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