AD 91-05-17
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
Cracks in the fuselage station 2598 bulkhead upper web in the corners of the access cut-out could lead to loss of the horizontal stabilizer.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Perform a close detailed visual inspection or high frequency eddy current (HFEC) inspection of the fuselage station 2598 bulkhead upper web within 30 days after April 13, 1990. Repeat inspections within 250 landings (if visual) or 1,000 landings (if HFEC). Remove fasteners, inspect open holes, replace with oversized fasteners, repair cracks under 1.5 inches prior to flight, or install terminating modification within 2 years of AD effective date.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
Within the next 30 days after April 13, 1990 (the effective date of Amendment 39-6556), and repeat as specified. Terminating modification must be accomplished within 2 years after the effective date of this AD.
AI-generated summary from the source AD text. Verify against the official source before acting.
Affected Aircraft
BOEING Model 747 series airplanes, line numbers 002 through 226, certificated in any category.
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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