AD 79-17-02 R2
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 7079-T6 truss and related 7079-T6 latch support fittings on the lower sill of the forward and aft lower cargo doorway due to corrosion, cracking, and blocked drainage paths.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Visually inspect the truss and latch support fittings for corrosion, cracking, and blocked drainage paths within 300 hours time-in-service after the effective date. Clear blocked drainage paths, replace cracked latch support fittings, and repair or replace corroded or cracked truss fittings before further flight. Repeat inspections at intervals not exceeding 1,200 flight hours until fittings are replaced with 7075-T73 fittings. Operators may extend one inspection interval to 2,000 flight hours under prior AD requirements.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
within 300 hours time-in-service after the effective date of this AD unless already accomplished
AI-generated summary from the source AD text. Verify against the official source before acting.
Affected Aircraft
All Model 747 series airplanes certificated in all categories listed in Boeing Service Bulletin 747-53-2200
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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