AD 89-25-04

89-25-04 BELL HELICOPTER TEXTRON, INC.: Amendment 39-6380. Docket No. 89-ASW-39.

Applicability: Model 222 helicopters, serial numbers (S/N) 47006 through 47079 and 47081 through 47084, and Model 222B helicopter, S/N 47132. This AD applies to these helicopters, certificated in any category, with tail rotor boost cylinder support bracket, part number (P/N) 222-031-471-001, installed.

Compliance: Required within 50 hours' time in service after the effective date of this AD, unless already accomplished.

To prevent failure of the tail rotor boost cylinder support bracket bulkhead, which could result in loss of the helicopter, accomplish the following:

(a) Modify the Station 340 bulkhead in accordance with Appendix I of this AD. (Note: Appendix I refers to Bell Helicopter Textron Alert Service Bulletin No. 222-89-55, dated August 24, 1989, which is not reprinted in this AD.)

(b) Compliance with BHTI Technical Bulletin No. 222-83-55, dated April 25, 1983, orPart II of Alert Service Bulletin No. 222-89-55, dated August 24, 1989, constitutes compliance with this AD.

(c) An alternate method of compliance which provides an equivalent level of safety, may be approved by the Manager, Rotorcraft Certification Office, Southwest Region, Federal Aviation Administration, Fort Worth, Texas 76193-0170.

This amendment (39-6380, AD 89-25-04) becomes effective on December 20, 1989.