84-06-04 MESSERSCHMITT-BOLKOW-BLOHM GmbH: Amendment 39-4834. Applies to HFB-320 airplanes as listed in HFB-320 Service Bulletin 55-8 dated September 14, 1983, certificated in all categories. Compliance is required as indicated unless previously accomplished. To prevent failure of the stabilizer/elevator outboard bearing housing fittings accomplish the following:
A. Within the next 25 hours time in service or 45 days after the effective date of this AD, whichever occurs first, perform a one-time inspection of the stabilizer/elevator outboard bearing housing fittings in accordance with HFB-320 Service Bulletin 55-8 dated September 14, 1983. Fittings with cracks greater than 0.79 inches must be replaced prior to further flight. Fittings cracked 0.79 inches or less must be stop drilled per the service bulletin, but also must be replaced within six months.
B. Alternate means of compliance which provide an equivalent level of safety may be used when approved by the Manager, Seattle Aircraft Certification Office, FAA, Northwest Mountain Region.
C. Special flight permits may be issued in accordance with FAR 21.197 and 21.199 to operate airplanes to a base for the accomplishment of inspections and/or modifications required by this AD.
This amendment becomes effective April 9, 1984.