AD 96-13-13 Airworthiness Directives; Fokker Model F28 Mark 0100 and 0070 Series Airplanes

Models named: F28 Mark 0100, F28 Mark 0070 series. Read the applicability below — it usually turns on serial or part numbers too.

Model F28 Mark 0100 and F28 Mark 0070 series airplanes, equipped with Aircraft Braking Systems Corp. brakes having part number (P/N) 5008132-2, -3, -4, -5, -6, -7, -8, or 5011809; certificated in any category. Note 1: This AD applies to each airplane identified in the preceding applicability provision, regardless of whether it has been otherwise 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.

Required as indicated, unless accomplished previously. To prevent loss of brake effectiveness during a high energy rejected take off (RTO), accomplish the following: Note 2: An alternate wear measurement (AWM) is a measurement of the brake stack that determines stack wear. This measurement is used for any brake assembly without a wear indicator pin, or any brake assembly having a damaged wear indicator pin. The brake wear can be determined by measuring the distance from the back of the pressure plate subassembly to the inboard face of the brake housing at the wear indicator location. (a) For Model F28 Mark 0100 series airplanes: Within 180 days after April 13, 1994 (the effective date of AD 94-06-06, amendment 39-8854), accomplish the requirements of paragraphs (a)(1) and (a)(2) of this AD: (1) Incorporate the maximum brake wear limits specified in the following tables into the FAA-approved maintenance inspection [[Page 33307]] program and comply with these measurements thereafter. Table 1.--Brake Manufacturer: Aircraft Braking Systems Corporation (ABS) ---------------------------------------------------------------------------------------------------------------- Maximum settings--non refurbished brakes ------------------------------------------------------------------------- Brake P/N- Maximum wear pin measurement- (inch/ Alternate wear measurement (inch/ mm) mm) ---------------------------------------------------------------------------------------------------------------- 5008132-2-............................ 1.85'' (47 mm) 4.00'' (101.6 mm) 5008132-3-............................ 1.85'' (47 mm) 4.00'' (101.6 mm) 5008132-4-............................ 2.10'' (53.3 mm) 4.25'' (107.9 mm) 5008132-5-............................ 2.10'' (53.3 mm) 4.25'' (107.9 mm) 5008132-6-............................ 2.10'' (53.3 mm) 4.25'' (107.9 mm) 5008132-7-............................ 2.10'' (53.3 mm) 4.25'' (107.9 mm) ---------------------------------------------------------------------------------------------------------------- Note 3: Measuring instructions for non refurbished brakes can be found in the ABS Component Maintenance Manual with Illustrated Parts List AP-652 (Fokker Manual No. 32-43-77) or in ABS Service Bulletin Fo100-32-35. ABS Service Bulletin Fo100-32-35 does not contain measurement information relative to brake P/N's 5008132-2 and -3. Table 2 ---------------------------------------------------------------------------------------------------------------- Maximum settings--refurbished brakes ------------------------------------------------------------------------- Brake P/N Maximum wear-pin measurement- (inch/ Alternate wear measurement (inch/ mm) mm) ---------------------------------------------------------------------------------------------------------------- 5008132-2............................. 1.85'' (47 mm) 4.00'' (101.6 mm) 5008132-3............................. 1.85'' (47 mm) 4.00'' (101.6 mm) 5008132-4............................. 2.20'' (55.9 mm) 4.35'' (110.5 mm) 5008132-5............................. 2.20'' (55.9 mm) 4.35'' (110.5 mm) 5008132-6............................. 2.20'' (55.9 mm) 4.35'' (110.5 mm) 5008132-7............................. 2.20'' (55.9 mm) 4.35'' (110.5 mm) ---------------------------------------------------------------------------------------------------------------- Note 4: Refurbished brakes will have ``R11-3'' etched on the brake housing adjacent to the shuttle valve. Note 5: Measuring instructions for refurbished brakes can be found in the ABS Component Maintenance Manual with Illustrated Parts List AP-652 (Fokker Manual No. 32-43-77) or in ABS Service Bulletin Fo100-32-38. (2) For brakes on which a heat stack kit having an ``R'' after the part number (i.e., 5010322-2R; also called ``short stacks'') have been installed: Operators must use the maximum wear pin length which is based on the measured wear of the thinnest disk in the stack and is specified on the Airworthiness Tag that accompanies each heat stack kit (i.e., for airplanes equipped with brakes having short stacks installed, do not use either the standard maximum wear pin measurements or the alternate brake wear measurements specified in either Table 1 or Table 2 of this AD to determine brake wear.) (b) Within 180 days after the effective date of this AD, incorporate the maximum brake wear pin limits specified in paragraphs (b)(1) and (b)(2) of this AD, as applicable, into the FAA-approved maintenance program and comply with these measurements thereafter. If any brake has measured wear beyond the maximum wear limits specified in those paragraphs, prior to further flight, replace it with a brake that is within the wear limits specified in the applicable paragraph. (1) For Model F28 Mark 0100 and 0070 series airplanes: Table 3 -------------------------------------------------------------------------------------------------------------------------------------------------------- Maximum settings--non-refurbished brakes (original equipment manufacturer) --------------------------------------------------------------------------------------------------------------------- Brake unit part No.- Measure in accordance with aircraft braking Maximum wear pin measurement- Alternate brake wear systems (ABS) component maintenance manual with measurement illustrated parts list (CMM w/IPL) number -------------------------------------------------------------------------------------------------------------------------------------------------------- 5008132-2......................... 1.85'' (47 mm) 4.00'' (101.6 mm) CMM w/IPL AP-652 (32-43-77) 5008132-3......................... 1.85'' (47 mm) 4.00'' (101.6 mm) CMM w/IPL AP-652 (32-43-77) 5008132-4......................... 2.10'' (53.3 mm) 4.25'' (107.9 mm) CMM w/IPL AP-652 (32-43-77) 5008132-5......................... 2.10'' (53.3 mm) 4.25'' (107.9 mm) CMM w/IPL AP-652 (32-43-77) 5008132-6......................... 2.10'' (53.3 mm) 4.25'' (107.9 mm) CMM w/IPL AP-652 (32-43-77) 5008132-7......................... 2.10'' (53.3 mm) 4.25'' (107.9 mm) CMM w/IPL AP-652 (32-43-77) 5008132-8......................... 2.20'' (55.9 mm) 4.35'' (110.5 mm) CMM w/IPL AP-652 (32-43-77) -------------------------------------------------------------------------------------------------------------------------------------------------------- [[Page 33308]] Table 4 -------------------------------------------------------------------------------------------------------------------------------------------------------- Maximum settings--refurbished brakes (R11-3 on brake housing) --------------------------------------------------------------------------------------------------------------------- Brake unit part number Measure in accordance with aircraft braking Maximum wear pin measurement Alternate brake wear systems (ABS) component maintenance manual with measurement illustrated parts list (CMM w/IPL) number -------------------------------------------------------------------------------------------------------------------------------------------------------- 5008132-2......................... 1.85'' (47 mm) 4.00'' (101.6 mm) CMM w/IPL AP-652(32-43-77) 5008132-3-........................ 1.85'' (47 mm) 4.00'' (101.6 mm) CMM w/IPL AP-652 (32-43-77) 5008132-4-........................ 2.20'' (55.9 mm) 4.35'' (110.5 mm) CMM w/IPL AP-652 (32-43-77) 5008132-5-........................ 2.20'' (55.9 mm) 4.35'' (110.5 mm)- CMM w/IPL AP-652 (32-43-77) 5008132-6-........................ 2.20'' (55.9 mm) 4.35'' (110.5 mm)- CMM w/IPL AP-652 (32-43-77) 5008132-7-........................ 2.20'' (55.9 mm) 4.35'' (110.5 mm)- CMM w/IPL AP-652 (32-43-77) 5008132-8-........................ 2.20'' (55.9 mm) 4.35'' (110.5 mm)- CMM w/IPL AP-652 (32-43-77) -------------------------------------------------------------------------------------------------------------------------------------------------------- (2) For Model F28 Mark 0100 and 0070 series airplanes equipped a brake unit having P/N 5011809, A5011809, or B5011809: The maximum wear pin measurement is 2.50'' (63.5 mm), with an alternate brake wear measurement of 4.35'' (110.5 mm). The measurement shall be done in accordance with Aircraft Braking Systems (ABS) Component Maintenance Manual (CMM) with Illustrated Parts List (IPL) AP-747 (32-43-65). (c) 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 6: Information concerning the existence of approved alternative methods of compliance with this AD, if any, may be obtained from the Standardization Branch, ANM-113. (d) 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. (e) This amendment becomes effective on August 1, 1996. Issued in Renton, Washington, on June 19, 1996. Darrell M. Pederson, Acting Manager, Transport Airplane Directorate, Aircraft Certification Service. - [FR Doc. 96-16242 Filed 6-26-96; 8:45 am] BILLING CODE 4910-13-U