AD 84-12-04

84-12-04 MITSUBISHI: Amendment 39-4883. Applies to Models MU-2B, -10, -15, 20, 25, -26, -26A, -30, -35, 36, 36A, 40, and -60 Serial Numbers 1 up to and including 1564 with or without the SA suffix airplanes certificated in any category.

NOTE: The serial numbers of airplanes manufactured in the United States by Mitsubishi Aircraft International, Inc. (MAI) are suffixed by "SA." The serial numbers of airplanes manufactured in Japan by Mitsubishi Heavy Industries, Ltd. (MHI) have no suffix.

Compliance: Required as indicated, unless already accomplished.

To prevent malfunction of the engine air inlet anti-ice system, accomplish the following:

(a) Within the next 25 hours time-in-service after the effective date of this AD, install on the main instrument panel, in full view of the pilot, a temporary placard, having letters at least 0.10 inch high, which reads as follows:

"FLIGHT INTO KNOWN ICING IS PROHIBITED."

(b) Within the next 100 hours time-in-service after the effective date of this AD, retorque and lockwire safety the bleed air tubing coupling nuts:

(1) On the MHI airplanes, in accordance with the instructions contained in Mitsubishi MU-2 Service Bulletin No. 196A, dated April 12, 1984, and

(2) On the MAI airplanes in accordance with the instructions contained in Mitsubishi Aircraft International, Inc., MU-2 Service Bulletin No. 047/30-001 dated February 20, 1984.

(c) When paragraph (b) of this AD has been accomplished, the placard specified in paragraph (a) is no longer required and shall be removed from the airplane.

(d) Airplanes may be flown in accordance with Federal Aviation Regulation 21.197 to a location where this AD can be accomplished.

(e) An equivalent method of compliance with this AD may be used on the MHI airplanes, if approved by the Manager, Western Aircraft Certification Office, ANM-170W, Federal Aviation Administration, P.O. Box 92007, Worldway Postal Center, Los Angeles, California90009, and on the MAI airplanes, if approved by the Manager, Airplane Certification Branch, ASW-150, Federal Aviation Administration, Southwest Region, P.O. Box 1689, Fort Worth, Texas 76101.

This amendment becomes effective on June 28, 1984.