AD 88-12-05
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | The Boeing Company | DC-9-31 | Airworthiness Directives; MCDONNELL DOUGLAS DC-9-30, DC-9-41, DC-9-51, DC-9-81, DC-9-82, and DC-9-83 Series Airplanes |
| aircraft | The Boeing Company | DC-9-32 | Airworthiness Directives; MCDONNELL DOUGLAS DC-9-30, DC-9-41, DC-9-51, DC-9-81, DC-9-82, and DC-9-83 Series Airplanes |
| aircraft | The Boeing Company | DC-9-32 (VC-9C) | Airworthiness Directives; MCDONNELL DOUGLAS DC-9-30, DC-9-41, DC-9-51, DC-9-81, DC-9-82, and DC-9-83 Series Airplanes |
| aircraft | The Boeing Company | DC-9-32F | Airworthiness Directives; MCDONNELL DOUGLAS DC-9-30, DC-9-41, DC-9-51, DC-9-81, DC-9-82, and DC-9-83 Series Airplanes |
| aircraft | The Boeing Company | DC-9-32F (C-9A) | Airworthiness Directives; MCDONNELL DOUGLAS DC-9-30, DC-9-41, DC-9-51, DC-9-81, DC-9-82, and DC-9-83 Series Airplanes |
| aircraft | The Boeing Company | DC-9-32F (C-9B) | Airworthiness Directives; MCDONNELL DOUGLAS DC-9-30, DC-9-41, DC-9-51, DC-9-81, DC-9-82, and DC-9-83 Series Airplanes |
| aircraft | The Boeing Company | DC-9-33F | Airworthiness Directives; MCDONNELL DOUGLAS DC-9-30, DC-9-41, DC-9-51, DC-9-81, DC-9-82, and DC-9-83 Series Airplanes |
| aircraft | The Boeing Company | DC-9-34 | Airworthiness Directives; MCDONNELL DOUGLAS DC-9-30, DC-9-41, DC-9-51, DC-9-81, DC-9-82, and DC-9-83 Series Airplanes |
| aircraft | The Boeing Company | DC-9-34F | Airworthiness Directives; MCDONNELL DOUGLAS DC-9-30, DC-9-41, DC-9-51, DC-9-81, DC-9-82, and DC-9-83 Series Airplanes |
| aircraft | The Boeing Company | DC-9-41 | Airworthiness Directives; MCDONNELL DOUGLAS DC-9-30, DC-9-41, DC-9-51, DC-9-81, DC-9-82, and DC-9-83 Series Airplanes |
Unsafe Condition
Inadvertent disarming of the Auto Brake System following exposure to momentary electrical power interruptions or transients.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Modify the Hydro-Aire Auto Brake Control Units with specified part numbers in accordance with McDonnell Douglas DC-9 Service Bulletin 32-216 within 12 months after the effective date of this AD. An alternate means of compliance or adjustment may be used if approved by the FAA.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
Within 12 months after the effective date of this airworthiness directive (AD)
AI-generated summary from the source AD text. Verify against the official source before acting.
Affected Aircraft
Models DC-9-30, DC-9-41, DC-9-51, DC-9-81, DC-9-82, and DC-9-83 series airplanes equipped with Hydro-Aire Auto Brake Control Units, Part Numbers 42-409, 42-409-1, 42-639, 42-639-1, 42-809, or 42-839.
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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