AD 70-25-03
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
Engine surge during thrust reversal could occur due to inadequate Air-Automatic Deceleration System and engine controls mixing box, airplane electrical wiring system, engine cowl panel, bleed duct bracket and pressure regulator vent line configurations.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Modify the engine Air-Automatic Deceleration System per Pratt and Whitney Service Bulletin 2841; modify engine controls mixing box, airplane electrical wiring system, engine cowl panel, bleed duct bracket, and pressure regulator vent line per Boeing Service Bulletin 75-2002; install a placard per Boeing Service Bulletin 78-2016 until all four engine modifications are completed.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
within the next 600 hours' time in service after the effective date of this AD
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Affected Aircraft
Boeing Model 747 Series Airplanes with Pratt and Whitney Model JT9D Series 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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