AD 89-21-05
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | The Boeing Company | 747-400 Series | Airworthiness Directives; BOEING Model 747-400 Series Airplanes |
Unsafe Condition
The possibility of airplane status messages not being properly latched into memory which may prevent maintenance from properly dispatching the airplane.
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Required Actions
Change the FAA-approved maintenance program to include special procedures described in Boeing Telegraphic Maintenance Tip 747-400 MT 31-12, add a warning to the AFM Limitations Section, and use alternate compliance methods if approved.
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Compliance Time
within 10 days after the effective date of this AD, unless previously accomplished
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Affected Aircraft
Boeing Model 747-400 series airplanes with Integrated Display System (IDS) software installed as identified in Boeing Telegraphic Maintenance Tip M-7201-89-1141, dated July 27, 1989.
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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