82-24-04: De-Icing System

82-24-04 MCDONNELL DOUGLAS: Amendment 39-4500. Applies to McDonnell Douglas Model DC-9-30, -50, and -80 series airplanes including C-9B airplanes, with manufacturer's serial numbers 48002 through 48020, 48024 through 48059, 48062, 48063, 48066 through 48074, 48079, 48080, 48083, 48086, 48087, 48092 through 48151, 48154 through 48159, 49100, 49101, 49112, 49113, and 49116 through 49119. \n\n\tCompliance required within 30 days from the effective date of this AD, unless already accomplished. \n\n\tTo assure proper functioning of the horizontal stabilizer leading edge de-icing system, accomplish the following: \n\n\tA.\tAccomplish the inspection, and if necessary, take the corrective action specified in the Accomplishment Instructions of McDonnell Douglas DC-9 Alert Service Bulletin A30-50, dated October 5, 1982, or later revisions approved by the Manager, Los Angeles Aircraft Certification Office, FAA, Northwest Mountain Region. \n\n\tB.\tAffected DC-9 airplanes may be operated after 30 days following the effective date of this AD, and prior to the accomplishment of Paragraph (A), above, under the following conditions: \n\n\t\t1)\tThey are not operated into known icing conditions; and \n\n\t\t2)\tA placard is installed in full view of the pilots which reads: "Flight into known icing conditions is prohibited." \n\n\tC.\tAlternate means of compliance which provide an equivalent level of safety may be used when approved by the Manager, Los Angeles Aircraft Certification Office, FAA, Northwest Mountain Region. \n\n\tD.\tSpecial flight permits may be issued in accordance with FAR 21.197 and 21.199 to operate airplanes to a base in order to comply with the requirements of this AD. \n\n\tThe manufacturer's specifications and procedures identified and described in this directive are incorporated herein and made a part hereof pursuant to 5 U.S.C. 552(a)(1). All persons affected by this directive who have not already received these documents from the manufacturer may obtain copies upon request to McDonnell Douglas Corporation, 3855 Lakewood Boulevard, Long Beach, California 90846, Attention: Director, Publications and Training, C1-750 (54-60). These documents also may be examined at FAA, Northwest Mountain Region, 17900 Pacific Highway South, C-68966, Seattle, Washington 98168, or Los Angeles Aircraft Certification Office, 4344 Donald Douglas Drive, Long Beach, California 90808. \n\n\tThis amendment becomes effective November 23, 1982.