AD 79-12-06
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Cessna Aircraft Company | 500 | Airworthiness Directives: CESSNA Models 500 and 501, 550 and 551 |
| aircraft | Cessna Aircraft Company | 501 | Airworthiness Directives: CESSNA Models 500 and 501, 550 and 551 |
| aircraft | Cessna Aircraft Company | 550 | Airworthiness Directives: CESSNA Models 500 and 501, 550 and 551 |
| aircraft | Cessna Aircraft Company | 551 | Airworthiness Directives: CESSNA Models 500 and 501, 550 and 551 |
Unsafe Condition
Cracks in the upper and lower spar cap stems at Wing Station 37.0 could lead to wing structural failure.
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Required Actions
Visually inspect then dye penetrant inspect the spar cap stems per thresholds in Table I. Reduce inspection intervals if cracks under 0.3 inches are found. Repair or modify wings if cracks are 0.3 inches or longer before further flight.
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Compliance Time
Within 100 hours time-in-service after the effective date, and thereafter as specified in the AD based on thresholds in Table I.
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Affected Aircraft
Cessna Models 500 (S/N 500-0001-500-0349), Models 500/501 (Unit -0350 through -0520), and Models 550/551 (Unit -0002 through -0114) with 600 or more hours time-in-service, excluding those modified per specified service bulletins.
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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