AIRWORTHINESS DIRECTIVE
CAA-AD-016/1999
Date of issue: January 31, 1999
ENGINE - TURBINE BLADE - REPLACEMENT
Applicability: Walter M601D, M601E, M601E-21 series engines, all serial numbers.
Reason: Gas generator tur
bine blade was broken off in operation due to reduced fatigue strength caused by increased content of zirconium in used ŽS6KVI alloy.Effective date:
February 25, 1999Compliance :
(a) Gas generator turbine blades must be replaced by exhausting determined life of 1000 cycles or 1000 hrs at latest.
(b) Blade replacement will be carried by the maintenance engineers of the WALTER a.s. Product Support Dept. after agreement or on request of the operator at operators facility (in case of necessity of replacement 5 turbine blades or less on 1 engine) or at manufacturer (in case of necessity of replacement more than 5 turbine blades on 1 engine) before gas generator turbine blade life termination above mentioned and as determined by Mandatory bulletins no.: M601D/27a, M601E/20a, M601E-21/1a.
Remarks: Where applicable, the requirements of this AD must be integrated into the Aircraft´s Logbook(s). Address inquiries concerning this AD to: Civil Aviation Authority, Airworthiness Division, Ruzyne Airport, 160 08 Prague 6, Czech Republic, tel: 420 2 324086, fax: 420 2 364112.
Ing. Pavel MATOUŠEK
Director of Airworthiness Division CAA CZ