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).

Dassault Falcon 900 and Falcon 900EX

The FAA has issued a final rule for certain Dassault bizjets. This amendment adopts a new Airworthiness Directive (AD), applicable to certain Dassault Model Mystere-Falcon 900 and Falcon 900EX series airplanes. The rule requires replacement of certain self-adhering soundproofing mats under the passenger consoles in the cabin, which are not sufficiently fire-retardant, with mats that are not self-adhering and are sufficiently fire-retardant. The FAA claims this is action -- which becomes effective July 3 -- is necessary to prevent an uncontrolled fire in the cabin.

Gulfstream Aerospace LP Model Astra SPX and 1125 Westwind Astra

The FAA has issued a final rule for certain Gulfstream bizjets. This amendment adopts a new AD applicable to certain Gulfstream Aerospace LP Model Astra SPX and 1125 Westwind Astra series airplanes that requires removing the existing oxygen shutoff valve and installing a new oxygen shutoff valve. The FAA claims the actions specified by this AD -- which becomes effective July 3 -- are intended to prevent rapid adiabatic compression within the oxygen line between the oxygen shutoff valve and the pressure regulator due to a shutoff valve that can be opened quickly, which could result in overheating of the oxygen system and consequent fire in the cockpit.

Israel Aircraft Industries 1100 Series

The FAA has issued a final rule for certain Israel Aircraft Industries 1100 Series jets. This amendment adopts a new AD, applicable to all Model 1121, 1121A, 1121B, 1123, 1124, and 1124A series airplanes, that requires removing the existing oxygen shutoff valve and installing a new oxygen shutoff valve. The FAA claims this action is necessary to prevent rapid adiabatic compression within the oxygen line between the oxygen shutoff valve and the pressure regulator due to a shutoff valve that can be opened quickly, which could result in overheating of the oxygen system, and consequent fire in the cockpit.

Learjet Model 45

The FAA has issued a Notice of Proposed Rulemaking (NPRM) for the Lear 45. This document proposes the supersedure of an existing Airworthiness Directive (AD), applicable to certain Learjet Model 45 airplanes, that currently requires repetitive application of grease to the rotating disk assembly of the nose landing gear (NLG) squat switch mechanism. This action would require replacement of the squat switch camrod of the NLG, which would terminate the repetitive application and would also reduce the applicability of the exiting AD. The FAA says this proposed AD is prompted by results of tests conducted by the airplane manufacturer. The agency claims the actions specified by this proposed AD are intended to prevent moisture contamination and subsequent formation of ice, which could cause bending and damage of the squat switch assembly, driving the nose wheel to an uncommanded angle against the force of the steering system. The agency says this condition, if not corrected, could result in the airplane departing the runway at high speeds during landing. Comments on this NPRM must be received by July 14, 2003.

MD Helicopters Model 600N

This document proposes adopting a new Airworthiness Directive for MD Helicopters Inc. Model 600N helicopters. The AD would require reducing the life limit of the main rotor drive shaft and changing the life limit shown on the component history card or equivalent record. The FAA says this proposal is prompted by the review of final fatigue test data, which indicates that the life limit of the drive shaft should be reduced by 2000 hours time-in-service (TIS). The agency claims the actions specified by the proposed AD are intended to prevent failure of the drive shaft, loss of drive to the main rotor system, and subsequent loss of control of the helicopter. Comments must be received on or before July 18, 2003.