AD 2010-12-04
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Pilatus | Aircraft Ltd | Airworthiness Directives; PILATUS Aircraft Ltd. Model PC-7 Airplanes |
Unsafe Condition
Corrosion at the bonding strap connections on the left and right lower longerons between fuselage frames 1 and 1A, caused by high electrical current flow between the tinned copper terminal lug of the bonding strap and the aluminum longeron. This could lead to longeron failure and prejudice the structural integrity of the aircraft.
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Required Actions
Perform a visual inspection of the forward bonding points and terminal lugs on the left and right lower longerons between fuselage frames 1 and 1A for signs of corrosion, following PILATUS PC-7 Service Bulletin No. 53-007. If corrosion is found, perform corrective actions in accordance with the Accomplishment Instructions in the same service bulletin. If corrosion damage is out of limits, record the values, apply to PILATUS for a repair scheme, and implement the repair.
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Compliance Time
Within 120 days after July 13, 2010 (the effective date of this AD).
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Affected Aircraft
PILATUS Aircraft Ltd. Model PC-7 airplanes, all serial numbers, 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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