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2001-08-04 BELL HELICOPTER TEXTRON INC.: Amendment 39-12181. Docket No. 2001- SW-06-AD. Supersedes AD 2000-25-03, Amendment 39-12037, Docket No. 2000-SW-49-AD.
Applicability:
(a) Model 205A-1 helicopters with a hydraulic servo actuator (actuator), part number (P/N) 41105950, serial numbers with an "HR" prefix up to and including 490, installed, certificated in any category; and
(b) Model 205A-1, 205B, 212, 412, 412CF, and 412EP helicopters with an actuator, P/N 41000470, serial numbers with an "HR" prefix up to and including 10010, installed, certificated in any category.
Note 1: P/N 41105950 is the P/N assigned by HR Textron, the actuator manufacturer. Bell Helicopter Textron, Inc. (BHTI) has assigned P/N 205-076-036 to this part when fitted with a support mount. P/N 41000470 is the P/N assigned by HR Textron; BHTI has assigned P/N 212-076-005 to this part when fitted with a support mount.
Note 2: This AD applies to each helicopter 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 helicopters 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 (d) 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 an actuator piston from unthreading from its rod end, loss of control of the main rotor, and subsequent loss of control of the helicopter, accomplish the following:
(a) Within 25 hours time-in-service (TIS), inspect the tab on the NAS513-6 locking washer on each actuator for any twisting or damage in accordance with the Accomplishment Instructions, paragraph A., of HR Textron Alert Service Bulletin (ASB) No. 41000470-67A-05, Revision 1, dated October 19, 2000 or HR Textron ASB No. 41105950-67A-01, Basic Issue, dated October 19, 2000, as applicable to the affected actuator P/N. Replace any twisted or damaged locking washer with an airworthy NAS1193K6C locking device before further flight.
(b) Within 100 hours TIS or at the next actuator overhaul, whichever occurs first, replace the NAS513-6 locking washer on each actuator with an airworthy NAS1193K6C locking device.
(c) Installation of an airworthy NAS1193K6C locking device on each of the three actuators constitutes terminating action for the requirements of this AD.
(d) 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, Rotorcraft Certification Office, Rotorcraft Directorate, FAA. Operators shall submit their requests through an FAA Principal Maintenance Inspector, who may concur or comment and then send it to the Manager, Rotorcraft Certification Office.
Note 3: Information concerning the existence of approved alternative methods of compliance with this AD, if any, may be obtained from the Rotorcraft Certification Office.
(e) 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 helicopter to a location where the requirements of this AD can be accomplished.
(f) The inspections and modifications shall be done in accordance with the Accomplishment Instructions, paragraph A., of HR Textron Alert Service Bulletin No. 41000470-67A-05, Revision 1 or HR Textron ASB No. 41105950-67A-01, Basic Issue, both dated October 19, 2000, as applicable to the affected actuator P/N. This incorporation byreference was previously approved by the Director of the Federal Register in accordance with 5 U.S.C. 552(a) and 1 CFR part 51 as of December 28, 2000 (65 FR 77780, December 13, 2000). Copies may be obtained from HR Textron, 25200 W. Rye Canyon Road, Santa Clarita, California 91355-1265, telephone (611) 294-6000, fax (661) 259-9622. Copies may be inspected at the FAA, Office of the Regional Counsel, Southwest Region, 2601 Meacham Blvd., Room 663, Fort Worth, Texas; or at the Office of the Federal Register, 800 North Capitol Street, NW., suite 700, Washington, DC.
Note 4: BHTI ASB No.'s 205-00-79, 205B-00-33, 212-00-109, 412-00-105, and 412CF-00-12, all dated October 19, 2000, pertain to the subject of this AD and include the applicable HR Textron Alert Service Bulletins.
(g) This amendment becomes effective on May 3, 2001.
