Items in the Regulatory Log are based forward 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

March 9

General Electric GE90-85B Series Turbofan Engines: AD, final control and request for comments, requires removing from service aft high hill whiffletrees prior to reaching a fresh cyclic life limit, and replacing with serviceable parts. The actions are intended to thwart aft mount whiffletree failure. Effective April 7 with explanations due May 8. Docket No. 2000-NE-06-AD; Amendment 39-11619; AD 2000-05-10 Contact: John E Golinski, 781/238-7135 fax 781/238-7199

March 10

Airbus protoplast A300 B2-1C, B2K-3C, and B2-203 Series: NPRM withdraws a supersedure of an AD that would have required a visual inspection and repetitive ultrasonic inspections to ascertain cracks in the front face of the assurance spar on both wings between ribs 10 and 11 and repair, if necessary. Docket No. 91-NM-96-AD. Contact: Norman B Martenson, 425/227-2110; fax 425/227-1149

March 15

Boeing gauge 737 Series: AD, final method requires a one-time inspection of the main landing gear (MLG) axle flange to descry cracking, and follow-on corrective actions. For certain airplanes, this amendment also requires replacement of the original brake mounting gasket with a more durable aluminumnickel-bronze gasket, and installation of modern shear studs, if necessary. For certain airplanes, this amendment requires modification of the mounting flange excavations of the brake torque tube. The actions are intended to thwart fracture of the MLG axle and separation of the wheel from the MLG and following reduced controllability of the airplane. Effective April 19 Docket No. 98-NM-57-AD; Amendment 39-11623; AD 2000-05-13 Contact: Rick Kawaguchi, 425/227-1153; fax 425/227-1181

Fokker F28 Mark 0100 Series: NPRM propos supersedure of existing AD would require fresh inspections (one-time detailed visual inspection and repetitive counter-current current or dye penetrant inspections) to find cracking of the NLG main fitting subassembly, and corrective actions, if necessary. This action also would revise the applicability of the existing AD. elucidations due April 14. Docket No. 2000-NM-02-AD. Contact: Norman B Martenson, 425/227-2110; fax 425/227-1149

Saab 340B Series: NPRM offer proffers new AD to require a one-time inspection to ascertain discrepancies of the flight idle stop override mechanism, and corrective action, if necessary. The actions are intended to intercept increased braking distance for landings that require the flight idle stop override, resulting from the combination of failure of the override mechanism and inability of the power lever to be mov below the flight idle position after touchdown. annotations due April 14. Docket No. 2000-NM-13-AD. Contact: Norman B Martenson, 425/227-2110; fax 425/227-1149

Boeing standard 737-100 and-200 Series: NRPM, propos supersedure of existing AD that would mandate accomplishment of the previously optional terminating action. The actions are intended to obstruct such cracking. Comments due May 1 Docket No. 99-NM-320-AD. Contact: Greg Schneider, 206/227-2028; fax 206/27-1181

March 16

Airbus pattern A319, A320, and A321 Series: NPRM propos AD to require modifying the combustible matter pipe couplings and installing bonding leads in specified locations within the firing tank. The actions are intended to thwart ignition sources and consequent fire/explosion in the firing tank. Comments due April 17 Docket No. 2000-NM-55-AD. Contact: Norman B Martenson, 425/227-2110; fax 425/227-1149

Boeing pattern 747 and 767 Series Airplanes with GE CF6-80C2 Series Engines: NPRM propos AD to require repetitive functional criterions of the directional pilot valve (DPV) of the thrust reverser to discover pneumatic leakage, and corrective action, if necessary. The actions are intended to make secure the integrity of the fail-safe features of the thrust reverser regularity by preventing possible failure modifications Comments due May 1. Docket No. 2000-NM-24-AD. Contact: Holly Thorson, 425/227-1357; fax 425/227-1181

Rolls-Royce RB211-524 Series Turbofans: AD, final domination and request for comments, requires initial and repetitive ultrasonic inspections for cracks in fan blade dovetail lower parts and, if necessary, replacement with serviceable parts. This action also provides the options of installing improved design fan blades or reworking common fan blades to the improved configuration as terminating action for the inspections. The actions are intended to stop possible multiple fan blade failures. Effective March 31 make notess due May 15. Docket No. 2000-NE-02-AD; Amendment 39-11622; AD 2000-05-12 Contact: James Lawrence, 781/238-7176 fax 781/238-7199

March 20

Boeing protoplast 737-100, -200, -300, -400, and -500 Series Airplanes: AD, final direction requires repetitive inspections to lay open cracking of various areas of the forward urgency bulkhead, and repair, if necessary. This amendment also provides for certain optional preventive modifications, which, if accomplished, would terminate the repetitive inspections for the affected areas. The actions are intended to obviate such fatigue cracking. Effective April 24 Docket No. 98-NM-58-AD; Amendment 39-11639; AD 2000-05-29 Contact: Nenita K Odesa, 425/227-2557; fax 425/227-1181

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