85-23-05 BELL HELICOPTER TEXTRON, INC.: Letter issued November 8, 1985. Applies to all Bell Helicopter Model 214B and 214ST series helicopters certified in all categories that have collective sleeve part number 214-010-411-001 or -003 with serial number Al9-00001 through Al9-00738 or serial number A-1 through A-10 installed.
Compliance is required before further flight after receipt of this AD, unless previously accomplished, and thereafter at 250 hour intervals.
To prevent failure of the collective sleeve, accomplish the following:
a. Before further flight after receipt of this priority letter AD, perform a magnetic particle inspection of the affected sleeves using the procedures described in Bell Alert Service Bulletin 214-84-26, dated March 12, 1984, or 214ST-84-17, dated March 12, 1984, as appropriate.
NOTE: It is essential that the paint and primer be removed as described in the service bulletins prior to performing the magnetic particle inspection.b. Repeat the magnetic particle inspection every 250 hours time in service.
c. If cracks are found, replace with serviceable parts.
d. An alternative means of compliance or adjustment of the compliance time, which provides an equivalent level of safety, must be approved by the Manager, Helicopter Certification Branch, Aircraft Certification Division, FAA, Southwest Region.
This airworthiness directive is effective upon receipt.