AD 99-17-02
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | The Boeing Company | 777-200 Series | Airworthiness Directives; BOEING Model 777 Series Airplanes |
| aircraft | The Boeing Company | 777-300 Series | Airworthiness Directives; BOEING Model 777 Series Airplanes |
Unsafe Condition
Excessive wear on the safety spring wear plate doublers attached to the auxiliary power unit (APU) firewall could result in a hole in the APU firewall, leading to decreased fire protection capability.
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Required Actions
Conduct repetitive inspections and measure wear of the safety spring wear plate doublers. Perform follow-on actions if wear exceeds limits. Conduct a one-time inspection for improper clearance between the wear plate doubler and APU firewall, and corrective actions if necessary. Optional terminating action for repetitive inspections is provided.
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Compliance Time
Within the compliance times specified in paragraphs (a), (b), and (c) of the AD (specific deadlines not explicitly stated in provided text).
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Affected Aircraft
Boeing Model 777-200 and 777-300 series airplanes listed as Groups 1 and 2 in Boeing Service Bulletin 777-53A0018, Revision 1.
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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