AD 2001-13-01

This amendment adopts a new airworthiness directive (AD), for Bell Helicopter Textron, Inc. (BHTI) Model 205A-1, 205B, 212, 412, 412EP, and 412CF helicopters. This AD requires removing each existing tail rotor counterweight bellcrank (bellcrank) retention nut (retention nut), replacing each retention nut with a zero hours time-in-service (TIS) retention nut; and follow-up inspections of installed retention nuts. This AD is prompted by an in-flight loss of a bellcrank due to failure of the retention nut. The actions specified by this AD are intended to prevent failure of the retention nut, which could result in the bellcrank migrating off the crosshead spindle, loss of tail rotor control, and subsequent loss of control of the helicopter.

Final rule.

2001-13-01 Bell Helicopter Textron, Inc.: Amendment 39-12281. Docket No. 2000-SW-48-AD.

Applicability: Model 205A-1, 205B, 212, 412, 412EP, and 412CF helicopters, certificated in any category.

Note 1: 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 (f) 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 failure of the tail rotor counterweight bellcrank (bellcrank) retention nut, which could result in the bellcrank migrating off the crosshead spindle, loss of tail rotor control, and subsequent loss of control of the helicopter, accomplish the following:

(a) For Model 205A-1 helicopters:

(1) Within 100 hours time-in-service (TIS) or 90 days after the effective date of this AD, whichever occurs first, remove the two existing retention nuts retaining the bellcranks, part number (P/N) 212-010-709-001 or 212-011-705-001, and install zero hours TIS retention nuts, P/N MS14145L6 or MS17826-6, in accordance with paragraphs (1) through (5) of the Accomplishment Instructions in Bell Helicopter Textron, Inc. Alert Service Bulletin (ASB) 205-00-77, Revision A, September 13, 2000 (205A-1 ASB). A used nut may not be installed.

(2) At intervals not to exceed 100 hours TIS after accomplishing paragraph (a)(1) of this AD, inspect the retention nuts and corrosion preventive compound (CPC) coating in accordance with paragraph (6) of the Accomplishment Instructions of the 205A-1 ASB. Reapply the CPC coating if deficiencies are found in the coverage and protection of the area. Replace any retention nut with any corrosion, mechanical damage, a crack, or looseness with an airworthy new retention nut before further flight.

(b) For Model 205B helicopters:

(1) Within 100 hours TIS or 90 days after the effective date of this AD, whichever occurs first, remove the two existing retention nuts retaining the bellcranks, P/N 212-011-705-001, and install retention nuts, P/N MS14145L6 or MS17826-6, in accordance with paragraphs (1) through (5) of the Accomplishment Instructions in Bell Helicopter Textron, Inc. ASB 205B-00-31, Revision A, dated September 13, 2000 (205B ASB). A used nut may not be installed.

(2) At intervals not to exceed 100 hours TIS after accomplishing paragraph (b)(1) of this AD, inspect the retention nuts and CPC coating in accordance with paragraph (6) of the Accomplishment Instructions in the 205B ASB. Reapply the CPC coating if deficiencies are found in the coverage and protection of the area. Replace any retention nut with any corrosion, mechanical damage, a crack, or looseness with an airworthy new retention nut before further flight.

(c) For Model 212 helicopters:

(1) Within 100 hours TIS or 90 days after the effective date of this AD, whichever occurs first, remove the two existing retention nuts retaining the bellcranks, P/N 212-010-709-001 or 212-011-705-001, and install retention nuts, P/N MS14145L6 or MS17826-6, in accordance with paragraphs (1) through (5) of the Accomplishment Instructions in Bell Helicopter Textron, Inc. Alert Service Bulletin 212-00-107, Revision A, dated September 13, 2000 (212 ASB). A used retention nut may not be installed.

(2) At intervals not to exceed 100 hours TIS after accomplishing paragraph (c)(1) of this AD, inspect the retention nuts and CPC coating in accordance with paragraph (6) of the Accomplishment Instructions in the 212 ASB. Reapply the CPC coating if deficiencies are found in the coverage and protection of the area. Replace any retention nut with any corrosion, mechanical damage, a crack, or looseness with an airworthy new nut before further flight.

(d) For Model 412 or 412EP helicopters:

(1) Within 100 hours TIS or 90 days after the effective date of this AD, whichever occurs first, remove the two existing retention nuts retaining the bellcranks, P/N 212-011-705-001, and install retention nuts, P/N MS14145L6 or MS17826-6, in accordance with paragraphs (1) through (5) of the Accomplishment Instructions in Bell Helicopter Textron, Inc. ASB 412-00-102, Revision A, dated September 13, 2000 (412 ASB). A used nut may not be installed.

(2) At intervals not to exceed 100 hours TIS after accomplishing paragraph (d)(1) of this AD, inspect the retention nuts and CPC coating in accordance with paragraph (6) of the Accomplishment Instructions in the 412 ASB. Reapply the CPC coating if deficiencies are found in the coverage and protection of the area. Replace any retention nut with any corrosion, mechanical damage, a crack, or looseness with an airworthy new retention nut before further flight.

(e) For Model 412CF helicopters:

(1) Within 100 hours TIS or 90 days after the effective date of this AD, whichever occurs first, remove the two existing retention nuts retaining the bellcranks, P/N 212-011-705-001, and install retention nuts, P/N MS14145L6 or MS17826-6, in accordance with paragraphs (1) through (5) of the Accomplishment Instructions in Bell Helicopter Textron, Inc. ASB 412CF-00-10, Revision A, September 13, 2000 (412CF ASB). A used nut may not be installed.

(2) At intervals not to exceed 100 hours TIS after accomplishing paragraph (e)(1) of this AD, inspect the retention nuts and CPC coating in accordance with paragraph (6) of the Accomplishment Instructions in the 412CF ASB. Reapply the CPC coating if deficiencies are found in the coverage and protection of the area. Replace any retention nut with any corrosion, mechanical damage, a crack, or looseness with an airworthy new nut before further flight.

(f) 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 2: Information concerning the existence of approved alternative methods of compliance with this AD, if any, may be obtained from the Rotorcraft Certification Office.

(g) 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.

(h) The modifications and inspections shall be done in accordance with paragraphs (1) through (6) of the Accomplishment Instructions in the following Bell Helicopter Textron, Inc. Alert Service Bulletins: No. 205-00-77, Revision A, dated September 13, 2000; No. 205B-00-31, Revision A, dated September 13, 2000; No. 212-00-107, Revision A, dated September 13, 2000; No. 412-00-102, Revision A, dated September 13, 2000; or No. 412CF-00-10, Revision A, September 13, 2000, as applicable. 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 Bell Helicopter Textron, Inc., P.O. Box 482, Fort Worth, Texas 76101, telephone (817) 280-3391, fax (817) 280-6466. 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.

(i) This amendment becomes effective on August 1, 2001.

A proposal to amend part 39 of the Federal Aviation Regulations (14 CFR part 39) to include an AD for BHTI Model 205A-1, 205B, 212, 412, 412EP, and 412CF helicopters was published in the Federal Register on March 8, 2001 (66 FR 13858). That action proposed to require the following:

Removing the two existing retention nuts within 100 hours TIS or 90 days, whichever occurs first;

Installing a retention nut, part number MS14145L6 or MS17826-6, which is limited to a one-time installation;

Inspecting the corrosion preventive compound (CPC) coating of the retention nut for deficiencies;

Inspecting the retention nut for corrosion, mechanical damage, a crack, or looseness; and

Replacing each retention nut, when necessary.

Interested persons have been afforded an opportunity to participate in the making of this amendment. No comments were received on the proposal or the FAA's determination of the cost to the public. The FAA has determinedthat air safety and the public interest require the adoption of the rule as proposed.

The FAA estimates that 423 helicopters of U.S. registry will be affected by this AD. It will take approximately 2.5 work hours per helicopter to replace each retention nut and 0.5 work hour to inspect each retention nut once. The average labor rate is $60 per work hour. Required parts will cost approximately $7 per helicopter. Based on these figures, the total cost impact of this AD on U.S. operators is estimated to be $155,241 to replace the retention nuts and inspect them once.

The regulations adopted herein will not have a substantial direct effect on the States, on the relationship between the national Government and the States, or on the distribution of power and responsibilities among the various levels of government. Therefore, it is determined that this final rule does not have federalism implications under Executive Order 13132.

For the reasons discussed above, I certify thatthis action (1) is not a "significant regulatory action" under Executive Order 12866; (2) is not a "significant rule" under DOT Regulatory Policies and Procedures (44 FR 11034, February 26, 1979); and (3) will not have a significant economic impact, positive or negative, on a substantial number of small entities under the criteria of the Regulatory Flexibility Act. A final evaluation has been prepared for this action and it is contained in the Rules Docket. A copy of it may be obtained from the Rules Docket at the location provided under the caption ADDRESSES.

List of Subjects in 14 CFR Part 39

Air transportation, Aircraft, Aviation safety, Incorporation by reference, Safety.

Adoption of the Amendment

Accordingly, pursuant to the authority delegated to me by the Administrator, the Federal Aviation Administration amends part 39 of the Federal Aviation Regulations (14 CFR part 39) as follows:

PART 39--AIRWORTHINESS DIRECTIVES

1. The authority citation for part39 continues to read as follows:

Authority: 49 U.S.C. 106(g), 40113, 44701.

Sec. 39.13 [Amended]

2. Section 39.13 is amended by adding a new airworthiness directive to read as follows: