Biz AV's AD Watch

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AVweb's coverage of Airworthiness Directives (ADs) includes the complete text of the documents, in Adobe's Portable Document Format (PDF).

Learjet Model 60

The FAA has published a Notice of Proposed Rulemaking (NPRM) to supersede an existing Airworthiness Directive (AD), applicable to certain Learjet Model 60 airplanes. The current AD requires inspection to detect bends in or damage to the fuel crossflow tube; inspection to determine clearance between the fuel crossflow tube and the flight control cables; and replacement or repair of the tube, if necessary. This new action would require a review of airplane maintenance records or an inspection to determine if a fuel crossflow tube having a certain part number is installed; and follow-on/corrective actions, as applicable. This action also would expand the applicability of the existing AD to include additional airplanes. The FAA says the actions specified by the proposed AD are intended to prevent chafing and consequent failure of the fuel crossflow tube due to inadequate clearance between the tube and the flight-control cables, which could result in loss of fuel from one fuel tank during normal operating conditions or loss of fuel from both main fuel tanks during fuel cross-feeding operations. The agency claims it is also intended to address the identified unsafe condition.

Comments on this NPRM must be received by August 4, 2003.

Agusta S.p.A. Model A109K2 Helicopters

The FAA has adopted a new Airworthiness Directive (AD) for Agusta S.p.A (Agusta) Model A109K2 helicopters. This action requires a visual check of each tail rotor blade for a crack; a visual inspection of each blade for a crack at specified intervals; and if necessary, a dye-penetrant inspection. Replacing any cracked blade with an airworthy blade before further flight is also required. This amendment is prompted by a report of a crack that occurred on an Agusta Model A109K2 blade. The FAA claims the actions specified in this AD -- which is effective July 11, 2003 -- are intended to detect fatigue cracks on the blades, which could result in loss of the blades and loss of control of the helicopter.