AD E8-2623
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Boeing | 747-100 | Airworthiness Directives; Viking Air Limited Model (Caribou) DHC-4 and (Caribou) DHC-4A Airplanes; and Boeing Model 747-100, 747-100B, 747-100B SUD, 747-200B, 747-200C, 747-200F, 747-300, 747-400, 747-400D, 747-400F, 747SR, and 747SP Series Airplanes |
| aircraft | Viking | Air AD requires doing a fluorescent penetrant inspection for cracking of certain upper engine mount bracket assemblies | Airworthiness Directives; Viking Air Limited Model (Caribou) DHC-4 and (Caribou) DHC-4A Airplanes; and Boeing Model 747-100, 747-100B, 747-100B SUD, 747-200B, 747-200C, 747-200F, 747-300, 747-400, 747-400D, 747-400F, 747SR, and 747SP Series Airplanes |
Unsafe Condition
Cracking of certain upper engine mount bracket assemblies; insufficient damage tolerance rating for structural significant items; lack of corrosion prevention and control program.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Inspect upper engine mount bracket assemblies using fluorescent penetrant inspection and take corrective actions if necessary; revise the FAA-approved maintenance inspection program to include inspections ensuring required damage tolerance ratings; implement a corrosion prevention and control program.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
Not specified in the provided information.
AI-generated summary from the source AD text. Verify against the official source before acting.
Affected Aircraft
Viking Air Limited Model (Caribou) DHC-4 and (Caribou) DHC-4A airplanes; Boeing Model 747-100, 747-100B, 747-100B SUD, 747-200B, 747-200C, 747-200F, 747-300, 747-400, 747-400D, 747-400F, 747SR, and 747SP series airplanes.
AI-generated summary from the source AD text. Verify against the official source before acting.
Source: Official FAA Source ↗
Retrieved: Apr 4, 2026
Rights: U.S. Government Public Domain
This site is not affiliated with or endorsed by the FAA. Always verify with official sources.