AD 88-05-07
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | The Boeing Company | 747-100 Series | Airworthiness Directives; BOEING Model 747 Series Airplanes |
| aircraft | The Boeing Company | 747-100B Series | Airworthiness Directives; BOEING Model 747 Series Airplanes |
| aircraft | The Boeing Company | 747-100B SUD Series | Airworthiness Directives; BOEING Model 747 Series Airplanes |
| aircraft | The Boeing Company | 747-200B Series | Airworthiness Directives; BOEING Model 747 Series Airplanes |
| aircraft | The Boeing Company | 747-200C Series | Airworthiness Directives; BOEING Model 747 Series Airplanes |
| aircraft | The Boeing Company | 747-200F Series | Airworthiness Directives; BOEING Model 747 Series Airplanes |
| aircraft | The Boeing Company | 747-300 Series | Airworthiness Directives; BOEING Model 747 Series Airplanes |
| aircraft | The Boeing Company | 747-400 Series | Airworthiness Directives; BOEING Model 747 Series Airplanes |
| aircraft | The Boeing Company | 747-400D Series | Airworthiness Directives; BOEING Model 747 Series Airplanes |
| aircraft | The Boeing Company | 747-400F Series | Airworthiness Directives; BOEING Model 747 Series Airplanes |
Unsafe Condition
Potential for a fire due to fuel leaking from the auxiliary power unit (APU) drain system.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Inspect the APU fuel supply line for fuel leaks within 30 days after the effective date and every 30 days thereafter. Repair any detected leakage before further flight. Modify the APU fuel line drain system, fuel pump drain, and turbine drain assembly in accordance with Boeing Service Bulletin 747-49-2051 to terminate the repetitive inspection requirement.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
Within the next 30 days after the effective date of this AD, and at intervals not to exceed 30 days thereafter
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Affected Aircraft
Model 747 series airplanes as listed in Boeing Service Bulletin 747-49-2051 dated November 5, 1987.
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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