AD 93-01-23

93-01-23 BEECH: Amendment 39-8477. Docket No. 92-CE-40-AD.

Applicability: Models 58 and 58A airplanes (serial numbers TH-1488, TH-1600, TH- 1613 through TH-1635, and TH-1638 through TH-1662, certificated in any category.

Compliance: Required within the next 50 hours TIS after the effective date of this AD, unless already accomplished.

To prevent fuel selector valve binding caused by pressure buildup in the crossfeed lines, which could result in the inability to control the fuel flow to the engines, accomplish the following:

(a) Replace both existing crossfeed check valves with new valves, part number 50- 380170-39, in accordance with the ACCOMPLISHMENT INSTRUCTIONS section of Beech Service Bulletin No. 2454, dated May 1992.

(b) Special flight permits may be issued in accordance with FAR 21.197 and 21.199 to operate the airplane to a location where the requirements of this AD can be accomplished.

(c) An alternative method of compliance or adjustmentof the compliance time that provides an equivalent level of safety may be approved by the Manager, Wichita Aircraft Certification Office, FAA, 1801 Airport Road, Room 100, Wichita, Kansas 67209. The request should be forwarded through an appropriate FAA Maintenance Inspector, who may add comments and send it to the Manager, Wichita Aircraft Certification Office.

NOTE: Information concerning the existence of approved alternative methods of compliance with this AD, if any, may be obtained from the Wichita Aircraft Certification Office.

(d) The replacement required by this AD shall be done in accordance with Beech Service Bulletin No. 2454, dated May 1992. This incorporation by reference was approved by the Director of the Federal Register in accordance with 5 U.S.C. 552(a) and 1 CFR Part 51. Copies may be obtained from the Beech Aircraft Corporation, P.O. Box 85, Wichita, Kansas 67201-0085. Copies may be inspected at the FAA, Central Region, Office of the Assistant Chief Counsel, Room 1558, 601 E. 12th Street, Kansas City, Missouri, or at the Office of the Federal Register, 800 North Capitol Street, NW., suite 700, Washington, DC.

(e) This amendment becomes effective on March 12, 1993.