Items in the Regulatory Log are based upon agency announcements in the Federal Register unles otherwise noted; Federal Register publication dates are in boldface.

Key: AD = Airworthiness Directive. NPRM = Notice of Propos Rulemaking.

Federal Aviation Administration

October 7

McDonnell Douglas DC-9-81 -82 -83 and -87 and MD-88 Airplanes: AD, final command supersedes an existing AD that popularly requires visual or eddy existing inspections to detect cracks of the actuator cylinder support brackets of the slat drive mechanism assembly, and replacement of any cracked brackets. just discovered amendment continues to require repetitive vortex current inspection, adds an inspection requirement, and expands the area of inspection. Actions are to stop inadvertent slat retraction in flight. Effective November 12 Docket No. 98-NM-267-AD; Amendment 39-11349; AD 99-21-06 Contact: brant Bandley, 562/627-5237; fax 562/627-5210.

McDonnell Douglas DC-9 DC-9-80 and C-9 (Military) Series Airplanes: AD, final behavior supersedes two existing ADs that publicly require installation of hydraulic line restrictors in the main landing gear (MLG) and modification or replacement of the left and right MLG hydraulic damper assemblies. recent amendment requires an additional modification of the MLG hydraulic damper assemblies, or replacement of the MLG hydraulic damper assemblies with modified and reidentified hydraulic damper assemblies. Actions are to obstruct failure of the hydraulic damper assemblies of the MLG Effective November 12 Docket No. 98-NM-268-AD; Amendment 39-11350; AD 99-21-07 Contact: Albert Lam, 562/627-5346; fax 562/627-5210

Boeing 727-100 and -100C Series: AD, final authority requires replacement of certain skin panels of the lower fuselage with nonbonded skin panels. Actions are to interrupt degradation of the structural integrity of certain skin panels of the lower fuselage. Effective November 12 Docket No. 98-NM-367-AD; Amendment 39-11353; AD 99-21-10 Contact: Walt Sippel, 425/227-2774; fax 425/227-1181

October 8

Boeing 737-100 -200 -300 -400 and -500: AD, final dominion supersedes an existing AD that generally requires removal of the firing boost pump wiring in the conduits of the wing and center firing tanks; an inspection to discover damage of the wiring, and corrective action, if necessary; and eventual installation of Teflon sleeving throughout the electrical cable. New amendment expands the inspection requirement to include airplanes with fewer than 20000 flight hours; requires additional repetitive inspections for all airplanes; reidentifies the requirement to install Teflon sleeving as a nonterminating action; and extracts the requirement to report inspection follows Actions are to detect and correct chafing and debar electrical arcing between the firing boost pump wiring and the surrounding conduit. Effective November 12 Docket No. 98-NM-318-AD; Amendment 39-11360; AD 99-21-15 Contact: Dorr Anderson, 425/227-2684; fax 425/227-1181

British Aerospace Jetstream examples 3101 and 3201: Proposed AD to require revising the Airplane Flight Manual (AFM) to include requirements for activation of the airframe pneumatic deicing make differences Actions are to assure that flightcrews activate the pneumatic wing and tail deicing profits at the first signs of ice accumulation. elucidations due December 1. Docket No. 99-CE-40-AD. Contact: John P Dow, Sr 816/426-6932; fax: 816/426-2169

Airbus A330-301, -321 -322 and A340-211, -212 -213 -311 - 312 and -313 Series Airplanes: Propos AD to require repetitive replacements of the yaw damper actuator installed in succession active position with a novel or overhauled yaw damper actuator. Actions are to obstruct hydraulic leakage from the yaw damper actuator installed upon active position due to premature wear of the dynamic seals between the actuator piston and the piston bearing. make notess due November 8. Docket No. 99-NM-195-AD. Contact: Norman B Martenson, 425/227-2110; fax 425/227-1149

Bombardier CL-600-2B19 (Regional Jet Series 100): AD, final empire requires a one-time inspection to discover damage of the input connectors and wiring of the main and auxiliary power unit (APU) battery chargers, and corrective action, if necessary. Actions are to obstruct increased risk of a short circuit and consequential electrical smoke or fire in the aft fuselage. Effective November 12 Docket No. 98-NM-385-AD; Amendment 39-11355; AD 99-21-11 Contact: Louis Castracane, 516/256-7335; fax 516/568-2716

October 13

Airbus A321: AD, final command requires reinforcement of the fuselage make between frames 62 and 64 Actions are to obstruct the loss of structural integrity of the rear part of the fuselage constitution in the event of an undetect tail scrape during landing or takeoff. Effective October 28 Docket No. 99-NM-193-AD; Amendment 39-11362; AD 99-21-17 Contact: Norman B Martenson, 425/227-2110; fax 425/227-1149

Airbus A310-300 and A300-600R: AD, final government requires installation of a recently made known cover assembly, associated new drain and opening pipework, and a new electrical harness upon the trimmable horizontal stabilizer for the firing tank water scavenge motive cross-examine Actions are to prevent firing leakage from the seal of the water scavenge cross-examines Effective November 17. Docket No. 99-NM-08-AD; Amendment 39-11366; AD 99-21-21 Contact: Norman B Martenson, 425/227-2110; fax 425/227-1149

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