2003-23-02 CESSNA AIRCRAFT COMPANY: Amendment 39-13365. Docket 2003- NM-225-AD.

Applicability: Model 560 airplanes, having serial numbers 0260 through 0396 inclusive, certificated in any category; except those on which Cessna Service Bulletin 560-34-93, dated March 16, 2001, has been accomplished.

Compliance: Required as indicated, unless accomplished previously.

To prevent a single-point failure in the trim system from causing a runaway trim condition that the pilot may be unable to stop by using the autopilot disconnect switch, which could result in loss of control of the airplane, accomplish the following:

Disengaging and Tie-Strapping Circuit Breakers
   (a)    Within 5 days or 10 hours time-in-service after the effective date of this AD, whichever is first: Disengage the PITCH TRIM circuit breaker on the left circuit breaker panel and the SERVO 1 circuit breaker on the right circuit breaker panel, and install tie straps on those circuit breakers, per paragraphs 1.A. and 1.B. of the Accomplishment Instructions of Cessna Alert Service Letter ASL560-27-10, dated October 10, 2003.

Airworthiness Directives; Cessna Model 560 Airplanes

AGENCY: Federal Aviation Administration, DOT.

ACTION: Final rule; request for comments.

SUMMARY: This amendment adopts a new airworthiness directive (AD) that is applicable to certain Cessna Model 560 airplanes. This action requires disengaging and tie-strapping the pitch trim and autopilot servo (servo 1) circuit breakers. This action also provides an optional inspection and follow-on actions that, if accomplished, terminates the requirement to disengage and tie-strap those circuit breakers. This action is necessary to prevent a single-point failure in the trim system from causing a runaway trim condition that the pilot may be unable to stop by using the autopilot-disconnect switch. This condition could result in loss of control of the airplane. This action is intended to address the identified unsafe condition.

DATES: Effective November 28, 2003.