Document ID: chunk:federal_register_of_legislation:F2006B10847:body:0:p2
Version: federal_register_of_legislation:F2006B10847
Segment Type: other
Provision Reference: 
Character Range: 3004–4277

identifies a discrepant flexible coupling is installed and spares are not available, it is permissible to operate the aircraft in accordance with Day VFR requirements until a serviceable flexible coupling is available or until the issue of the next maintenance release, whichever occurs first.

             If an aircraft is to be operated under this provision, make an appropriate entry on the maintenance release and affix a placard annotated thus "DAY VFR OPERATIONS ONLY" in view of the pilot in command. The maintenance release entry can be closed and the placard removed upon fitment of a serviceable flexible coupling.

2.    As of the effective date of this Directive.

           This Airworthiness Directive becomes effective on 4 December 1998.

           Background: The FAA has received 50 reports of failures of the flexible coupling on certain Parker Hannifin Airborne Dry Pumps, Conversion Kits and Coupling Kits that have been installed in aircraft or engines.

           These failures have been attributed to a manufacturing defect of the B1-19-1 flexible coupling manufactured between 1 January 1998 and 13 October 1998. This condition could result in loss of primary attitude and direction references during Instrument Flight Rules (IFR) operations.