AD 96-13-09 Airworthiness Directives; Jetstream Model 4101 Airplanes

Models named: 4101. Read the applicability below — it usually turns on serial or part numbers too.

All Model 4101 airplanes, certificated in any category. 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.

Required as indicated, unless accomplished previously. To prevent severe vibration of one or both engines, which could cause in-flight engine shutdown, accomplish the following: (a) Within 7 days after the effective date of this AD, review the airplane maintenance records to determine the hours time-in- service (TIS) accumulated on the bearings in the Lucas Aerospace Power Systems starter/generator units of both engines, in accordance with Jetstream Alert Service Bulletin J41-A24-036, dated February 26, 1996. (1) If the bearings on both of the starter/generator units have accumulated 300 or more hours TIS: Prior to further flight, replace at least one of the starter/generator units with a unit having bearings with less than 300 hours TIS, in accordance with the alert service bulletin. (2) If the bearings on one or both starter/generator units have bearings with less than 300 hours TIS: Prior to the accumulation of 300 hours TIS on the bearings on both starter/generator units, remove at least one of the units and replace it with a unit having bearings with less than 300 hours TIS, in accordance with the alert service bulletin. (b) As a continuing requirement thereafter: Prior to the accumulation of 300 hours TIS on the bearings on both of the Lucas Aerospace Power Systems starter/generator units on the airplane, remove at least one of those units and replace it with a unit having bearings with less than 300 hours TIS, in accordance with Jetstream Alert Service Bulletin J41-A24-036, dated February 26, 1996. (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 2: 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) The actions shall be done in accordance Jetstream Alert Service Bulletin J41-A24-036, dated February 26, 1996. This incorporation by reference was approved previously by the Director of the Federal Register, in accordance with 5 U.S.C. 552(a) and 1 CFR part 51, as of July 15, 1996 (61 FR 33647, June 28, 1996). Copies may be obtained from Jetstream Aircraft, Inc., P.O. Box 16029, Dulles International Airport, Washington, DC 20041-6029. Copies may be inspected at the FAA, Transport Airplane Directorate, 1601 Lind Avenue, SW., Renton, Washington; or at the Office of the Federal Register, 800 North Capitol Street, NW., suite 700, Washington, DC. (f) This amendment becomes effective on July 15, 1996. Issued in Renton, Washington, on September 24, 1996. Darrell M. Pederson, Acting Manager, Transport Airplane Directorate, Aircraft Certification Service. [FR Doc. 96-25039 Filed 9-30-96; 8:45 am] BILLING CODE 4910-13-U