AD 89-05-04 R1
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 emanating from the first four fail-safe bar fastener holes of flap track numbers 1, 3, 6, and 8 in reworked or interim production flap tracks can lead to flap track failure.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Revise the AFM limitations section to restrict maximum landing flaps to 25 degrees (unless necessary for safe operation), conduct close visual or borescope inspections of flap track holes at specified intervals, apply corrosion inhibitors, perform eddy current inspections, and replace or rework cracked tracks. Additional inspections of flap track webs and modifications to fastener holes are required as per service bulletins.
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Compliance Time
Required as indicated, unless previously accomplished.
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Affected Aircraft
Boeing Model 747 series airplanes listed in Boeing Service Bulletin 747-57A2229, Revision 7, with reworked or interim production flap tracks (part numbers identified in the service bulletin).
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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