90-11-01 BOEING OF CANADA, LTD., DEHAVILLAND: Amendment 39-6752. Final Rule of priority letter AD. Docket No. 90-CE-36-AD.
Applicability: Models DHC-6-1, DHC-6-100, DHC-6-200, and DHC-6-300 (all serial numbers) airplanes certificated in any category.
Compliance: Required within the next 25 hours time-in-service (TIS) after the effective date of this AD unless previously accomplished within the last 25 hours TIS prior to the effective date of this AD.
To prevent failure of the elevator pushrod assembly due to fatigue cracking, and the subsequent loss of control of the airplane, accomplish the following:
(a) Remove the aft elevator control quadrant to elevator control horn pushrod from the airplane and remove the rod ends from both ends of the pushrod.
(b) Visually inspect the pushrod and rod ends to ensure they are not bent, corroded, cracked, or damaged, and that the rod end bearings are free to rotate.
(c) Thoroughly clean the rod ends and inspectfor cracks using a high sensitivity fluorescent dye penetrant.
(d) Prior to further flight, using serviceable parts, replace any pushrods, rod ends or bearings which are bent, corroded, cracked or seized. Retain all defective parts for possible future examination by the FAA for 60 days after the date of the inspection. If the FAA has not requested this part before that time, properly dispose of the defective parts.
(e) Within one week following the inspections specified in paragraphs (b) and (c) of this AD, submit a written report of the result of the inspections to include whether or not damage was found, part number(s) involved, extent, location, and description of any damage found. Submit the report to the FAA, Manager, New York Aircraft Certification Office, 181 South Franklin Avenue, Valley Stream, New York 11581; Telephone (516) 791-6220; Facsimile (516) 791-9024. If the inspections were made previous to this AD, forward the requested data within one week of receiptof this AD. (Information collection requirements contained in this regulation have been approved by the Office of Management and Budget (OMB) under the provisions of the Paperwork Reduction Act of 1980 (P.L. 96-511) and have been assigned OMB Control Number 2120-0056.)
(f) Airplanes may be flown in accordance with FAR 21.197 to a location where this AD may be accomplished.
(g) An equivalent means of compliance or an adjustment of the compliance time of this AD may be approved by the Manager, New York Aircraft Certification Office, 181 South Franklin Avenue, Valley Stream, New York 11581; Telephone (516) 791-6220; Facsimile (516) 791-9024.
NOTE: The request should be forwarded through an FAA Maintenance Inspector, who may add comments and then send it to the Manager, New York Aircraft Certification Office.
This amendment (39-6752, AD 90-11-01) becomes effective on November 16, 1990, to all persons except those to whom it has already been made effective by priorityletter from the FAA dated May 21, 1990.