AD 98-20-21
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | The Boeing Company | DC-9-81 (MD-81) | Airworthiness Directives; McDonnell Douglas Model DC-9-80 Series Airplanes |
| aircraft | The Boeing Company | DC-9-82 (MD-82) | Airworthiness Directives; McDonnell Douglas Model DC-9-80 Series Airplanes |
| aircraft | The Boeing Company | DC-9-83 (MD-83) | Airworthiness Directives; McDonnell Douglas Model DC-9-80 Series Airplanes |
| aircraft | The Boeing Company | DC-9-87 (MD-87) | Airworthiness Directives; McDonnell Douglas Model DC-9-80 Series Airplanes |
Unsafe Condition
Failures of the electrical connectors in the sidewall fluorescent lighting system, resulting in poor socket/pin contact, excessive heat, electrical arcing, and connector burnthrough and smoke in the passenger cabin.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Inspect electrical plugs and receptacles of the sidewall lighting system in the passenger cabin to detect discrepancies, verify pins and sockets are even, seated, and locked. Replace discrepant parts with new parts and modify electrical wiring and connectors as specified.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
Required as indicated, unless accomplished previously.
AI-generated summary from the source AD text. Verify against the official source before acting.
Affected Aircraft
McDonnell Douglas Model DC-9-80 series airplanes equipped with Heath Tecna Aerospace Extended Spacial Concept Interior III installed per Revision A (March 7, 1989) or Revision B (February 16, 1990) of Drawing List HPD-DL-34 under STC SA4744NM.
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
This site is not affiliated with or endorsed by the FAA. Always verify with official sources.