AD 77-13-06
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Pilatus Aircraft Limited | PC-6 | Airworthiness Directives; Pilatus Model PC-6 Airplanes (all variants); Fairchild Hiller Model PC-6 Airplanes |
| aircraft | Pilatus Aircraft Limited | PC-6-H1 | Airworthiness Directives; Pilatus Model PC-6 Airplanes (all variants); Fairchild Hiller Model PC-6 Airplanes |
| aircraft | Pilatus Aircraft Limited | PC-6-H2 | Airworthiness Directives; Pilatus Model PC-6 Airplanes (all variants); Fairchild Hiller Model PC-6 Airplanes |
| aircraft | Pilatus Aircraft Limited | PC-6/350 | Airworthiness Directives; Pilatus Model PC-6 Airplanes (all variants); Fairchild Hiller Model PC-6 Airplanes |
| aircraft | Pilatus Aircraft Limited | PC-6/350-H1 | Airworthiness Directives; Pilatus Model PC-6 Airplanes (all variants); Fairchild Hiller Model PC-6 Airplanes |
| aircraft | Pilatus Aircraft Limited | PC-6/350-H2 | Airworthiness Directives; Pilatus Model PC-6 Airplanes (all variants); Fairchild Hiller Model PC-6 Airplanes |
| aircraft | Pilatus Aircraft Limited | PC-6/A | Airworthiness Directives; Pilatus Model PC-6 Airplanes (all variants); Fairchild Hiller Model PC-6 Airplanes |
| aircraft | Pilatus Aircraft Limited | PC-6/A-H1 | Airworthiness Directives; Pilatus Model PC-6 Airplanes (all variants); Fairchild Hiller Model PC-6 Airplanes |
| aircraft | Pilatus Aircraft Limited | PC-6/A-H2 | Airworthiness Directives; Pilatus Model PC-6 Airplanes (all variants); Fairchild Hiller Model PC-6 Airplanes |
| aircraft | Pilatus Aircraft Limited | PC-6/B-H2 | Airworthiness Directives; Pilatus Model PC-6 Airplanes (all variants); Fairchild Hiller Model PC-6 Airplanes |
Unsafe Condition
Landing flap nose rib fatigue failure
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Within 25 hours time in service after the effective date, inspect end ribs of landing flaps for cracks every 100 hours. Repair cracks before further flight. Reinforce nose end ribs within 1,000 hours time-in-service. Discontinue inspections after reinforcement and repairs are completed.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
within the next 25 hours time in service after the effective date of this AD, unless already accomplished within the last 25 hours time in service, and, thereafter, at intervals not to exceed 100 hours time in service since the last inspection
AI-generated summary from the source AD text. Verify against the official source before acting.
Affected Aircraft
Pilatus Model PC-6 airplanes (all variants) with serial numbers up through 743 and Fairchild Hiller Model PC-6 airplanes, serial numbers 2001 through 2019, 2021 through 2038, and 2040 through 2049
AI-generated summary from the source AD text. Verify against the official source before acting.
Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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