AD 90-06-06
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
Structural failure due to trailing edge flap track issues and other structural modifications required under the Aging Airplane Service Bulletin Program.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Accomplish structural modifications listed in Section 3 of Boeing Document D6-35999, replace trailing edge flap tracks per Boeing Alert Service Bulletin 747-57A2229, revise 8, within 5 years after AD effective date. Incorporate APU cutout reinforcement per SB 747-53-2275, rev 3, prior to 20,000 flights or within 5,000 flights after AD effective date. Replace cracked 1241 bulkhead splice strap per SB 747-53-2283, rev 3 within 4 years after AD effective date or prior to 20,000 flight cycles, whichever is later.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
Prior to reaching incorporation thresholds in D6-35999, or within the next 4 years after AD effective date, whichever occurs later. For flap tracks, within 5 years after AD effective date. For APU cutout, prior to 20,000 flights or within 5,000 flights after AD effective date. For bulkhead strap, within 4 years after AD effective date or prior to 20,000 flight cycles.
AI-generated summary from the source AD text. Verify against the official source before acting.
Affected Aircraft
Boeing Model 747 series airplanes listed in Boeing Document D6-35999, dated March 31, 1989, 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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