AD 98-15-15
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | The Boeing Company | DC-9-31 | Airworthiness Directives; McDonnell Douglas Model DC-9-30, -40, and -50 Series Airplanes; Model DC-9-81 (MD-81), DC-9-82 (MD-82), DC-9-83 (MD-83), and DC-9-87 (MD-87) Series Airplanes; Model MD-88 Airplanes; and C-9 (Military) Series Airplanes |
| aircraft | The Boeing Company | DC-9-32 | Airworthiness Directives; McDonnell Douglas Model DC-9-30, -40, and -50 Series Airplanes; Model DC-9-81 (MD-81), DC-9-82 (MD-82), DC-9-83 (MD-83), and DC-9-87 (MD-87) Series Airplanes; Model MD-88 Airplanes; and C-9 (Military) Series Airplanes |
| aircraft | The Boeing Company | DC-9-32 (VC-9C) | Airworthiness Directives; McDonnell Douglas Model DC-9-30, -40, and -50 Series Airplanes; Model DC-9-81 (MD-81), DC-9-82 (MD-82), DC-9-83 (MD-83), and DC-9-87 (MD-87) Series Airplanes; Model MD-88 Airplanes; and C-9 (Military) Series Airplanes |
| aircraft | The Boeing Company | DC-9-32F | Airworthiness Directives; McDonnell Douglas Model DC-9-30, -40, and -50 Series Airplanes; Model DC-9-81 (MD-81), DC-9-82 (MD-82), DC-9-83 (MD-83), and DC-9-87 (MD-87) Series Airplanes; Model MD-88 Airplanes; and C-9 (Military) Series Airplanes |
| aircraft | The Boeing Company | DC-9-32F (C-9A) | Airworthiness Directives; McDonnell Douglas Model DC-9-30, -40, and -50 Series Airplanes; Model DC-9-81 (MD-81), DC-9-82 (MD-82), DC-9-83 (MD-83), and DC-9-87 (MD-87) Series Airplanes; Model MD-88 Airplanes; and C-9 (Military) Series Airplanes |
| aircraft | The Boeing Company | DC-9-32F (C-9B) | Airworthiness Directives; McDonnell Douglas Model DC-9-30, -40, and -50 Series Airplanes; Model DC-9-81 (MD-81), DC-9-82 (MD-82), DC-9-83 (MD-83), and DC-9-87 (MD-87) Series Airplanes; Model MD-88 Airplanes; and C-9 (Military) Series Airplanes |
| aircraft | The Boeing Company | DC-9-33F | Airworthiness Directives; McDonnell Douglas Model DC-9-30, -40, and -50 Series Airplanes; Model DC-9-81 (MD-81), DC-9-82 (MD-82), DC-9-83 (MD-83), and DC-9-87 (MD-87) Series Airplanes; Model MD-88 Airplanes; and C-9 (Military) Series Airplanes |
| aircraft | The Boeing Company | DC-9-34 | Airworthiness Directives; McDonnell Douglas Model DC-9-30, -40, and -50 Series Airplanes; Model DC-9-81 (MD-81), DC-9-82 (MD-82), DC-9-83 (MD-83), and DC-9-87 (MD-87) Series Airplanes; Model MD-88 Airplanes; and C-9 (Military) Series Airplanes |
| aircraft | The Boeing Company | DC-9-34F | Airworthiness Directives; McDonnell Douglas Model DC-9-30, -40, and -50 Series Airplanes; Model DC-9-81 (MD-81), DC-9-82 (MD-82), DC-9-83 (MD-83), and DC-9-87 (MD-87) Series Airplanes; Model MD-88 Airplanes; and C-9 (Military) Series Airplanes |
| aircraft | The Boeing Company | DC-9-41 | Airworthiness Directives; McDonnell Douglas Model DC-9-30, -40, and -50 Series Airplanes; Model DC-9-81 (MD-81), DC-9-82 (MD-82), DC-9-83 (MD-83), and DC-9-87 (MD-87) Series Airplanes; Model MD-88 Airplanes; and C-9 (Military) Series Airplanes |
Unsafe Condition
Chafing of the FIREX supply pipe could result in a hole in the pipe and consequently prevent the proper distribution of the fire extinguishing agent within the nacelle in the event of a fire.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Within 8 months after the effective date, perform an inspection to detect chafing of the FIREX pipe assembly of the number one engine. If chafing is detected, prior to further flight, repair or replace chafed pipe assemblies and modify the FIREX and pneumatic sense pipe assembly clamp marriage. If no chafing is detected, modify the clamp marriage prior to further flight.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
Within 8 months after the effective date of this AD
AI-generated summary from the source AD text. Verify against the official source before acting.
Affected Aircraft
McDonnell Douglas Model DC-9-30, -40, -50, DC-9-81 (MD-81), DC-9-82 (MD-82), DC-9-83 (MD-83), DC-9-87 (MD-87), MD-88, and C-9 (Military) series airplanes as listed in Service Bulletin DC9-26-025, Revision 04 or 05.
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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