Biz AV's AD Watch
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.