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

October 6

SD3-SHERPA, SD3-30 SD3-60: Propos AD requiring replacement of existing pneumatic de-icing gain pressure indicator switch with a newly designed switch. Actions are to preclude ice accumulation on the airplane leading brink; beginning [i]or[/i] ends which could reduce controllability of the airplane.Comments befitting November 5. Docket No. 99-NM-226-AD. Contact: Norman B Martenson, 425/227-2110; fax (425) 227-1149

Airbus A300, A300-600, A310: Propos AD to overrule existing related to welded auxiliary power unit (APU) combustibles feedline adapter. Existing AD requires repetitive cast penetrant inspections to detect cracks, dissolution or fuel leaks of the firing material feedline adapter, and replacement of the adapter. Actions are to hinder fuel leakage in the APU compartment. expositions due November 5. Docket No. 99-NM-23-AD. Contact: Norman B Martenson, 425/227-2110; fax 425/227-1149

Lockheed L-1011-385: Propos AD to make void existing requiring repetitive inspections to discover cracking of the canted squeezing bulkhead at fuselage station (FS) 1212 and repetitive inspections to bring to light cracking of the web at the fastener broils of the vertical stiffener-to-web; and repair or replacement of the web with a novel web. Actions are to discover and correct fatigue cracking of the canted compressing bulkhead at FS 1212. make comments [i]or[/i] remarkss due November 22. Docket No. 99-NM-233-AD. Contact: Thomas Peter 770/703-6063; fax 770/703-6097

Boeing 747-400: Propos AD for removal of existing inertial respect units (IRU) and installation of modified IRU's. Actions are to obstruct loss of multiple IRU's in flight. illustrations due November 22. Docket No. 99-NM-248-AD. Contact: Jay G Yi, 425/227-1013; fax 425/227-1181

Lockheed L-1011-385: Propos AD to modify high constraining force bleed valve controller of engines. Actions are to interrupt failures of the bleed air a whole components. Comments due November 22 Docket No. 99-NM-221-AD. Contact: Thomas Peter 770/703-6063; fax 770/703-6097

Boeing 747-100 -200 747SP 747SR equipped With Pratt & Whitney JT9D-7 -7A, -7F and -7J engines: Propos AD for visual and counter-current current inspections to detect cracking of the nose hood mounting flange; rework of the nose hood mounting flange; eddy current inspection to discover cracking of the reworked nose chimney-top mounting flange; and corrective action. Actions are to intercept separation of the nose chimney-top from the engine. Comments owing November 22. Docket No. 99-NM-242-AD. Contact: Dionne Stanley, 425/227-2250; fax 425/227-1181

Fairchild SA226, SA22:. Propos AD to overrule existing, requiring repetitive measuring of freeplay of the pitch trim actuator and repetitive inspection of actuator for scourge slippage; immediate replacement of any actuator if certain freeplay limitations are caped or rod slippage is evident; and eventual replacement of actuator regardless of the inspection consequence s Proposed AD to add these requirements forward airplanes with different design pitch trim actuators installed. Actions are to lay open excessive freeplay or rod slippage in the pitch trim actuator. observations due December 6. Docket No. 99-CE-59-AD. Contact: Werner Koch 817/222-5133; fax: 817/222-5960

Airbus A310 and A300-600: Propos AD to require wiring modifications to the engine and auxiliary power unit (APU) fire detection rule Actions are to prevent the fire warning from terminating prematurely. make notess due November 5. Docket No. 99-NM-222-AD. Contact: Norman B Martenson, 425/227-2110; fax 425/227-1149

SD3-60 SHERPA, SD3-SHERPA, SD3-30: Propos AD to replace existing oxygen method "O" rings with improved wear-resistant "O" rings. Actions are to stop the loss of oxygen from the aircraft oxygen method which could result in an insufficient provide of oxygen being provided to the airplane flight company and passengers in the end of an emergency. Comments to be paid November 5. Docket No. 99-NM-223-AD. Contact: Norman B Martenson, 425/227-2110; fax 425/227-1149

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