AD 93-18-01 ACTIVE

93-18-01 JETSTREAM AIRCRAFT LIMITED: Amendment 39-8701. Docket 93-NM-155-AD.
Applicability: All Model 4101 series airplanes, certificated in any category.

Compliance: Required as indicated, unless accomplished previously.

To prevent the migration of the aileron trim tab hinge pins out of the hinge, which could impede the movement of the aileron control system and cause reduced controllability of the airplane, accomplish the following:

(a) Within 25 hours time-in-service after the effective date of this AD, conduct a visual inspection of the inboard and outboard ends of the hinge pin (wire) of the trim tab on the aileron to determine if the pin has moved or can be moved out of the hinge, in accordance with "Part 1 - Initial Inspection Left and Right," of the Accomplishment Instructions of Jetstream Alert Service Bulletin J41-A27-020, dated August 13, 1993.

(b) If the pin has moved, or if the pin moves out of the hinge when the end of the wire is tapped, prior to further flight, accomplish the corrective procedures specified in "Part 3, Rectification, Left and Right," of the Accomplishment Instructions of Jetstream Alert Service Bulletin J41-A27-020, dated August 13, 1993. After accomplishment of this corrective action, no further action is required by this AD.

(c) If the pin is correctly positioned, within 50 hours time-in- service, conduct a visual inspection of the inboard and outboard ends of the hinge pin (wire) of the trim tab on the aileron to assure reliability, in accordance with "Part 2 - Repeat Inspection Left and Right," of the Accomplishment Instructions of Jetstream Alert Service Bulletin J41-A27-020, dated August 13, 1993.

(1) If the pin is correctly positioned, no further action is required by this AD.

(2) If the pin has moved, or if the pin moves out of the hinge when the end of the wire is tapped, prior to further flight, accomplish the corrective procedures specified in "Part 3 - Rectification, Leftand Right," of the Accomplishment Instructions of the service bulletin. After accomplishment of this corrective action, no further action is required by this AD.

(d) An alternative method of compliance or adjustment of the compliance time that provides an acceptable level of safety may be used if approved by the Manager, Standardization Branch, ANM-113, FAA, Transport Airplane Directorate. Operators shall submit their requests through an appropriate FAA Principal Maintenance Inspector, who may add comments and then send it to the Manager, Standardization Branch, ANM-113.

NOTE: Information concerning the existence of approved alternative methods of compliance with this AD, if any, may be obtained from the Standardization Branch, ANM-113.

(e) 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.

(f) The inspections and corrective procedures shall be done in accordance with Jetstream Alert Service Bulletin J41-A27-020, dated August 13, 1993. 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 Jetstream Aircraft, Inc., P.O. Box 16029, Dulles International Airport, Washington, DC 20041-6029. Copies may be inspected at the FAA, Transport Airplane Directorate, 1601 Lind Avenue, SW., Renton, Washington; or at the Office of the Federal Register, 800 North Capitol Street, NW., suite 700, Washington, DC.

(g) This amendment becomes effective on November 9, 1993, to all persons except those persons to whom it was made immediately effective by priority letter AD 93-18-01, issued on September 7, 1993, which contained the requirements of this amendment.