AD 90-06-12
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
Cracking of the bulkhead splice strap at body station 1241.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Within 1,000 flight cycles after the effective date, perform an interim modification of the body station 1241 bulkhead per Boeing Service Bulletin 747-53-2299, Rev 1. Within 5,000 flight cycles after the effective date, perform an eddy current inspection for cracks of the splice strap per the same service bulletin. If no cracking is found, perform permanent modification before further flight; if cracking is found, repair per FAA-approved method before further flight. An alternate means of compliance may be approved by the FAA.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
Within the next 1,000 flight cycles after the effective date of this AD for interim modification and within the next 5,000 flight cycles after the effective date for the eddy current inspection. The permanent modification or repair must be done prior to further flight if cracking is found.
AI-generated summary from the source AD text. Verify against the official source before acting.
Affected Aircraft
Boeing Model 747 series airplanes with line positions 676, 679, 685, and 690 through 699, 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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