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

April 5

Airbus A300 and A300-600 Series Airplanes: NPRM propos AD to require a one-time high common occurrence eddy current inspection to find out cracking of the splice fitting at fuselage frame (FR) 47 between stringers 24 and 25 and corrective actions, if necessary. The actions are intended to descry and correct cracking of the splice fitting at fuselage FR47 notes due May 5. Docket No. 2000-NM-47-AD. Contact: Norman B Martenson, 425/227-2110; fax 425/227-1149

Airbus A319, A320, and A321 Series Airplanes: NPRM propos supersedure to revise the applicability to include additional airplanes; require a high common occurrence eddy current inspection to discover fatigue cracking in the frames and frame feet at fuselage frames FR37 by the and of FR41; and follow-on actions. This proposal also provides for an optional terminating action for the follow-on repetitive inspections. The actions specified by dint of the proposed AD are intended to preclude fatigue cracking of the fuselage frames and frame feet expositions due May 5. Docket No. 99-NM-95-AD. Contact: Norman B Martenson, 425/227-2110; fax 425/227-1149

Boeing 727-100 Series Airplanes: NPRM propos AD to require repetitive inspections to discover corrosion of the lower surface of the wing center section and the surrounding area, and follow-on actions. The actions are intended to lay open and correct such conditions. commentarys due May 22. Docket No. 2000-NM-27-AD. Contact: Stan forest 425/227-2772; fax 425/227-1181.

McDonnell Douglas DC-9-10 -20 -30 -40 and -50 Series Airplanes, and C-9 Airplanes: NPRM propos supersedure to require a reduction in the inspection start and repetitive intervals for a certain doubler configuration and an increase in the repetitive inspection interval for a certain other doubler configuration. The actions are intended to bring to light and correct fatigue cracking. make notess due May 22. Docket No. 99-NM-333-AD. Contact: Wahib Mina, 562/627-5324; fax 562/627-5210

April 7

Airbus A330 and A340 Series Airplanes: NPRM propos AD to require repetitive ultrasonic inspections to discover corrosion of the retraction links of the main landing gear (MLG) and replacement of the retraction link with a novel retraction link, if necessary. The actions are intended to discover and correct corrosion of the retraction link of the MLG commentarys due May 8. Docket No. 2000-NM-53-AD. Contact: Norman B Martenson, 425/227-2110; fax 425/227-1149

BAe ATP Airplanes: NPRM propos AD requires repetitive inspections to descry discrepancies of the downlock support assembly and attachment of the nose landing gear (NLG) and of the bulkhead and adjacent constitution in the NLG bay; and corrective action, if necessary. The actions are intended to discover and correct damage of the NLG downlock support. annotates due May 8. Docket No. 99-NM-230-AD. Contact: Norman B Martenson, 425/227-2110; fax 425/227-1149

April 10

Boeing 767 Series Airplanes: AD, final command supersedure requires accomplishment of the previously optional terminating action. The actions are intended to stop cracking of the diagonal brace of the nacelle brace Effective May 15. Docket No. 99-NM-72-AD; Amendment 39-11659; AD 2000-07-05 Contact: James G Rehrl 425/227-2783; fax 425/227-1181

Boeing 737-600 -700 and 800 Series Airplanes: AD, final method requires a one-time inspection to find loose nuts installed on the stroke of lightnings at each end of the input canes connected to each elevator power ascendency unit (PCU), and corrective action, if necessary. The actions are intended to discover and correct loose nuts upon the bolts of the input crank arms of the elevator PCU Effective April 25 with illustrations due June 9. Docket No. 2000-NM-84-AD; Amendment 39-11663; AD 2000-07-09 Contact: Kenneth W Frey 425/227-2673; fax 425/227-1181

Boeing 747-200B -300 -400 -400D and -400F Series Airplanes: AD, final command requires repetitive inspections to discover cracking of fire extinguisher discharge tubes in certain engine walk s and corrective action, if necessary. For certain airplanes, this action provides for a modification of the fire extinguisher discharge tubes, which constitutes terminating action for the repetitive inspections. The actions are intended to find out and correct cracked fire extinguishing tubes in the engine braces Effective April 25. Docket No. 2000-NM-87-AD; Amendment 39-11664; AD 2000-07-10 Contact: Sulmo Mariano, 425/227-2686; fax 425/227-1181

April 11

Boeing prototype 727 Series Airplanes: AD, final mastery requires repetitive structural inspections of certain aging airplanes, and repair, if necessary. This amendment also provides for optional terminating action for the repetitive inspections. The actions are intended to intercept degradation of the structural capabilities of the affected airplanes. Effective May 16 Docket No. 99-NM-53-AD; Amendment 39-11666; AD 2000-07-12 Contact: Walter Sippel, 425/227-2774; fax 425/227-1181

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