AD 92-06-11

92-06-11 BEECH: Amendment 39-8191; Docket 91-CE-78-AD.

Applicability: The following Beech model airplanes that are equipped with Collins DPU-85N Display Processor Units (DPU) and Collins MPU-85N Multifunction Processor Units (MPU), certificated in any category:

Model Serial Numbers B200 BB-1349 through BB-1409 300 FA-205 through FA-217 B300 FL-1 through FL-60 B300C FM-1 through FM-3 1900C UC-73, UC-139 and UC-147

Compliance: Required as indicated, unless already accomplished.

To prevent incorrect pilot decisions based on undetected erroneous attitude information displayed by the Collins EFIS-85/86B (14) system or undesired autopilot movement of the airplane, accomplish the following:

(a) Within the next 50 hours time-in-service (TIS) after the effective date of this AD, modify the airplane autopilot/flight director system wiring in accordance with the instructions in Beech Service Bulletin (SB) No. 2423, dated December 1991.

(b) Within the next 6 calendar months after the effective date of this AD, modify the hardware of the Collins EFIS-85/86B (14) system, Collins DPU-85N Display Processor Unit, and Collins MPU-85N Multifunction Processor Unit in accordance with the instructions in Collins SB DPU-85N-34-51 and SB MPU-85N-34-51, both dated June 6, 1991.

(c) 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.

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

(e) The modifications required by this AD shall be done in accordance with Beech Service Bulletin No. 2423, dated December 1991, and Collins Service Bulletin DPU-85N-34-51 and Collins Service Bulletin MPU-85N-34-51, both dated June 6, 1991. 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; or Rockwell International, Collins General Aviation Division, 400 Collins Road, NE; Cedar Rapids, Iowa 52498. 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, 1100 L Street, NW; Room 8401, Washington, DC.

(f) This amendment (39-8191) becomes effective on March 30, 1992.