AD 59-20-04
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | The Boeing Company | 707-100 Long Body | BOEING 707-100 Series Aircraft |
| aircraft | The Boeing Company | 707-100B Long Body | BOEING 707-100 Series Aircraft |
| aircraft | The Boeing Company | 707-100B Short Body | BOEING 707-100 Series Aircraft |
Unsafe Condition
Failures of the welded flanges at each end of the turbocompressor bleed duct mounted on the high pressure bleed port of the engine have caused damage to surrounding structure due to excessive pressure and temperature in the cowl and required engine shutdown due to high EGT and low EPR.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Add an additional fillet weld to the external side of the three flanges on the turbocompressor engine bleed duct assembly and strengthen the existing boss weld by welding gussets to both the boss and duct in accordance with Boeing Service Bulletin No. 543.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
November 15, 1959
AI-generated summary from the source AD text. Verify against the official source before acting.
Affected Aircraft
Boeing 707-100 series aircraft with serial numbers 17586 through 17591, 17609 through 17612, 17628 through 17652, 17658 through 17672, 17696 through 17702, 17925 through 17927.
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
This site is not affiliated with or endorsed by the FAA. Always verify with official sources.