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

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

September 15

Saab SF340A and 340B: AD, final authority requires repetitive inspections to bring to light cracking around certain fastener cavitys and adjacent areas of the van spar of the horizontal stabilizers; and corrective actions, if necessary. Actions are to thwart failure of the front spar proper to fatigue cracking around certain fastener openings of the front spar of the horizontal stabilizers. Effective October 20 Docket No. 98-NM-220-AD; Amendment 39-11310; AD 99-19-21 Contact: Norman B Martenson, 425/227-2110; fax 425/227-1149

September 20

Airbus A340: AD, final method requires repetitive inspections to discover cracking of the right inboard attachment tug of the main fitting of the center landing gear (CLG) and replacement with a recently made known or serviceable CLG, if necessary. Actions are to expose and correct cracks in the attachment tug Effective October 5. Docket No. 99-NM-175-AD; Amendment 39-11318; AD 99-19-31 Contact: Norman B Martenson, 425/227-2110; fax 425/227-1149

September 22

Fokker F28 Mark 0070 and 0100: AD, final lordship supersedes an existing AD that publicly requires Airplane Flight Manual (AFM) and maintenance program revisions, modifications, and repetitive checks associated with ensuring the integrity of the thrust reverser connected view New amendment continues to require the modifications and repetitive checks, and adds an AFM revision, repetitive operational touchstones and other modifications related to the thrust reverser theory Actions are to ensure protection against inadvertent deployment of the thrust reverser during flight. Effective October 27 Docket No. 98-NM-329-AD; Amendment 39-11330; AD 99-20-02 Contact: Norman B Martenson, 425/227-2110; fax 425/227-1149

Fokker F28 Mark 0070 and 0100: AD, final method requires modification of the electrical wiring of the flight warning computer (FWC) and installation of upgraded computer software into the FWC Actions are to obviate certain nuisance alerts generated according to the FWC and to render certain annunciation of certain flight alerts by means of the FWC during initial climb. Effective October 27 Docket No. 98-NM-328-AD; Amendment 39-11329; AD 99-20-01 Contact: Norman B Martenson, 425/227-2110; fax 425/227-1149

Airbus A310 and A300-600: AD, final sway requires a detailed visual inspection to discover damage to the terminal pulls on the 12XC and 15XE connectors and the mounting pulls on the 15XE connector; and repair or replacement of the terminal hauls or the 15XE connector with of recent origin parts, if necessary. Actions are to descry and correct broken terminal and mounting pulls on the 15XE and 12XC connectors in the 101VU panel in the avionics compartment. Effective October 27 Docket No. 99-NM-110-AD; Amendment 39-11327; AD 99-19-40 Contact: Norman B Martenson, 425/227-2110; fax 425/227-1149

Bombardier DHC-8-100 and -300: AD, final order requires replacement of the main landing gear (MLG) uplock actuator in succession both the left and right MLG with a novel redesigned uplock assembly. Actions are to interrupt failure of the MLG to prolong when a "gear down" selection is made. Effective October 27 Docket No. 98-NM-384-AD; Amendment 39-11324; AD 99-19-37 Contact: Paolo Farina, 516/256-7530; fax 516/568-2716

Bombardier CL-600-2B19 (Regional Jet Series 100): AD, final lordship requires removal of the insulation blankets surrounding the turn of events overwing exit hatches. Actions are to stop the freezing of moisture entrapped in the fiberglass/foam insulation installed upon the fuselage structure between the overwing exit door and the fuselage door frame and intercostal. Effective October 27 Docket No. 99-NM-92-AD; Amendment 39-11326; AD 99-19-39 Contact: Paolo Farina, 516/256-7530; fax 516/568-2716

Bombardier DHC-8-100 and -300: AD, final command requires modification of certain hydraulic rules that provide hydraulic pressure for the mastery of the rudder and for the main landing gear brakes. Actions are to hinder damage to certain hydraulic body components in the number 2 engine nacelle. Effective October 27 Docket No. 97-NM-58-AD; Amendment 39-11321; AD 99-19-34 Contact: Anthony Gallo, 516/256-7510; fax 516/568-2716

Bombardier DHC-8-100 and -300: AD, final authority requires modification of certain hydraulic arrangements that provide hydraulic pressure for the curb of the rudder and for the main landing gear brakes. Actions are to stop damage to certain hydraulic hypothesis components in the number 2 engine nacelle. Effective October 27 Docket No. 97-NM-58-AD; Amendment 39-11321; AD 99-19-34 Contact: Anthony Gallo, 516/256-7510; fax 516/568-2716

Saab SF340A and 340B: AD, final authority requires modification of the insulation pads in the lower side of the fuselage at the wing aft area. Actions are to stop loose insulation from interfering with an aileron hinder cable. Effective October 27. Docket No. 99-NM-118-AD; Amendment 39-11328; AD 99-19-41 Contact: Norman B Martenson, 425/227-2110; fax 425/227-1149