AD 85-25-55
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | The Boeing Company | 747-100 Series | BOEING Model 747 Series Airplanes |
| aircraft | The Boeing Company | 747-100B Series | BOEING Model 747 Series Airplanes |
| aircraft | The Boeing Company | 747-100B SUD Series | BOEING Model 747 Series Airplanes |
| aircraft | The Boeing Company | 747-200B Series | BOEING Model 747 Series Airplanes |
| aircraft | The Boeing Company | 747-200C Series | BOEING Model 747 Series Airplanes |
| aircraft | The Boeing Company | 747-200F Series | BOEING Model 747 Series Airplanes |
| aircraft | The Boeing Company | 747-300 Series | BOEING Model 747 Series Airplanes |
| aircraft | The Boeing Company | 747-400 Series | BOEING Model 747 Series Airplanes |
| aircraft | The Boeing Company | 747-400D Series | BOEING Model 747 Series Airplanes |
| aircraft | The Boeing Company | 747-400F Series | BOEING Model 747 Series Airplanes |
Unsafe Condition
Failure of the Engine Number 1 control cable which may cause loss of control of the engine
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Within 48 hours following receipt of this AD, and thereafter at intervals not to exceed 600 flight hours, perform inspections and repair in accordance with Boeing Alert Service Bulletin 747-76A-2063, Revision 1, dated December 18, 1985, or later FAA-approved revisions. Modification of the Engine Number 1 engine control cable in accordance with Boeing Service Bulletin 747-76-2063, dated July 12, 1985, constitutes terminating action for this AD.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
Within 48 hours following receipt of this AD
AI-generated summary from the source AD text. Verify against the official source before acting.
Affected Aircraft
All Model 747 series airplanes, line number 1 through 607, powered by General Electric CF6 or Pratt & Whitney Aircraft JT9D-70A turbofan engines
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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