AD 2004-25-09
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Boeing | 707 | Airworthiness Directives; Boeing Model 707 Airplanes and Model 720 and 720B Series Airplanes |
Unsafe Condition
Reports of in-service cracking of the support ribs for the main landing gear (MLG) trunnion, which could result in collapse of the MLG.
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Required Actions
Within 6 months after the effective date, perform a detailed inspection for corrosion and cracking of the left and right support ribs of the MLG trunnion. Repeat the inspection every 6 months. Within 12 months after the effective date, perform a HFEC inspection for cracking of the left and right support ribs of the MLG trunnion. Repeat the HFEC inspection every 12 months. If corrosion or cracking is found, take corrective actions before further flight, as specified in the alert service bulletin or an approved repair method.
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Compliance Time
Within 6 months for the initial detailed inspection, and within 12 months for the initial HFEC inspection.
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Affected Aircraft
All Boeing Model 707-100 long body, -200, -100B long body, and -100B short body series airplanes; Model 707-300, -300B, -300C, and -400 airplanes; and Model 720 and 720B series airplanes, certificated in any category.
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Source: Official FAA Source ↗
Retrieved: Apr 6, 2026
Rights: U.S. Government Public Domain
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