Airworthiness directives › 99-18-18
AD 99-18-18 Airworthiness Directives; Dowty Aerospace Propellers Model R381/ 6-123-F/5 Propellers
Makes named: dowty. Models named: R381/6-123-F/5. Read the applicability below — it usually turns on serial or part numbers too.
Applicability*9
Dowty Aerospace Propellers Model R381/6-123-F/5 propellers, installed on but not limited to SAAB 2000 series airplanes. Note 1: This airworthiness directive (AD) applies to each propeller 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 propellers 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 as indicated, unless accomplished previously. To prevent propeller blade cracks and propagation, which could result in propeller blade separation and possible aircraft loss of control, accomplish the following: Visual Inspections (a) Perform initial and repetitive visual inspections of propeller blades for cracks across the camber face in accordance with the Accomplishment Instructions of Dowty Aerospace Propellers Service Bulletin (SB) No. S2000-61-75, Revision 1, dated June 11, 1999, as follows: (1) Initially inspect within 50 hours time-in-service (TIS) after the effective date of this AD. (2) Thereafter, inspect at intervals not to exceed 50 hours TIS since last inspection. (3) Replace cracked propeller blades prior to further flight with serviceable blades. Ultrasonic (UT) Inspections (b) Perform initial and repetitive UT inspections of propeller blades for cracks across the camber face in accordance with the Accomplishment Instructions of Dowty Aerospace Propellers SB No. S2000-61-75, Revision 1, dated June 11, 1999, as follows: (1) Initially inspect within 200 hours TIS after the effective date of this AD. (2) Thereafter, inspect at intervals not to exceed 200 hours TIS since last inspection. (3) Replace cracked propeller blades prior to further flight with serviceable blades. (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, Boston Aircraft Certification Office (ACO). Operators shall submit their requests through an appropriate FAA Principal Maintenance Inspector, who may add comments and then send it to the Manager, Boston ACO. Note 2: Information concerning the existence of approved alternative methods of compliance with this airworthiness directive, if any, may be obtained from the Boston ACO. (d) Special flight permits may be issued in accordance with Secs. 21.197 and 21.199 of the Federal Aviation Regulations (14 CFR 21.197 and 21.199) to operate the aircraft to a location where the inspection requirements of this AD can be accomplished. (e) The actions required by this AD shall be performed in accordance with Dowty Aerospace Propellers SB No. S2000-61-75, Revision 1, dated June 11, 1999. 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 Dowty Aerospace Propellers, Anson Business Park, Cheltenham Road East, Gloucester GL29QN, England; telephone +44 1452 716000, fax +44 1452 716001. Copies may be inspected at the FAA, New England Region, Office of the Regional Counsel, 12 New England Executive Park, Burlington, MA; or at the Office of the Federal Register, 800 North Capitol Street, NW, suite 700, Washington, DC. (f) This amendment becomes effective on September 16, 1999. Issued in Burlington, Massachusetts, on August 25, 1999. David A. Downey, Assistant Manager, Engine and Propeller Directorate, Aircraft Certification Service. [FR Doc. 99-22563 Filed 8-31-99; 8:45 am] BILLING CODE 4910-13-U
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