Airworthiness directives › 96-24-08
AD 96-24-08 Airworthiness Directives; Air Tractor, Inc. Models AT-250, AT- 300, AT-301, AT-302, AT-400, AT-400A, AT-401, AT-402, AT-501, and AT- 502 Airplanes
Applicability*9
The following airplane models and serial numbers, certificated in any category, that are equipped with a Gerdes part number (P/N) A-850-5 or Cleveland P/N 60-9 parking brake valve : ------------------------------------------------------------------------ Model Serial Numbers ------------------------------------------------------------------------ AT-250.............................. 250-0491. AT-300.............................. 300-0001 through 300-0708. AT-301.............................. 301-0001 through 301-0708. AT-302.............................. 302-0001 through 302-0708. AT-400.............................. 400-0001 through 400-0708. AT-400A............................. 400A-0001 through 400A-0708. AT-401.............................. 401-0001 through 401-0708. AT-402.............................. 402-0001 through 402-0708. AT-501.............................. 501-0001 through 501-0036. AT-502.............................. 502-0001 through 502-0036. ------------------------------------------------------------------------ Note 1: This AD applies to each airplane identified in the preceding applicability provision, regardless of whether it has been modified, altered, or repaired in the area subject to the requirements of this AD. For airplanes that have been modified, altered, or repaired so that the performance of the requirements of this AD is affected, the owner/operator must request approval for an alternative method of compliance in accordance with paragraph (c) of this AD. The request should include an assessment of the effect of the modification, alteration, or repair on the unsafe condition addressed by this AD; and, if the unsafe condition has not been eliminated, the request should include specific proposed actions to address it.
Compliance
Required within the next 75 hours time-in- service after the effective date of this AD, unless already accomplished. To prevent the airplane from overturning because of extreme pressure applied to the brake if the parking brake valve inadvertently slips to the ``PARK'' position during flight, accomplish the following: (a) Replace the Gerdes P/N A-850-5 or Cleveland P/N 60-9 parking brake valve with a Scott P/N 4500A-2 parking brake valve. Accomplish this replacement in accordance with Air Tractor Service Letter #76 Instructions, as referenced in Snow Engineering Co. Service Letter #76, dated December 12, 1988. (b) Special flight permits may be issued in accordance with sections 21.197 and 21.199 of the Federal Aviation Regulations (14 CFR 21.197 and 21.199) to operate the airplane to a location where the requirements of this AD can be accomplished. (c) An alternative method of compliance or adjustment of the compliance time that provides an equivalent level of safety may be approved by the Manager, FAA, Aircraft Certification Office, 2601 Meacham Boulevard, Fort Worth, Texas 76193-0150. The request shall be forwarded through an appropriate FAA Maintenance Inspector, who may add comments and then send it to the Manager, Fort Worth ACO. Note 2: Information concerning the existence of approved alternative methods of compliance with this AD, if any, may be obtained from the Fort Worth ACO. (d) The replacement required by this AD shall be done in accordance with Air Tractor Service Letter #76 Instructions, as referenced in Snow Engineering Co. Service Letter #76, dated December 12, 1988. 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 Air Tractor Inc., P. O. Box 485, Olney, Texas 76374. Copies may be inspected at the FAA, Central Region, Office of the Assistant Chief Counsel, Room 1558, 601 E. 12th Street, Kansas City, Missouri, or at the Office of the Federal Register, 800 North Capitol Street, NW., suite 700, Washington, DC. (e) This amendment (39-9833) becomes effective on December 23, 1996. Issued in Kansas City, Missouri, on November 15, 1996. Michael Gallagher, Manager, Small Airplane Directorate, Aircraft Certification Service. [FR Doc. 96-29863 Filed 11-25-96; 8:45 am] BILLING CODE 4910-13-U
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