1AD/SWSA226/54 - Placard - Use of Reverse Thrust

COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY

SCHEDULE OF AIRWORTHINESS DIRECTIVES

Image unavailable in extracted text
Fairchild (Swearingen) SA226 and SA227 Series Aeroplanes

AD/SWSA226/54 Placard - Use of Reverse Thrust 10/87 DM

Applicability: All model Swearingen SA-226 fitted with Garrett TPE-331 turboprop engines to which Hartzell model HC-B4(T,M)N-5( ) propellers are fitted.

Requirement: Install a temporary placard in a suitable position in the cockpit worded as follows: “Until propellers are modified to Hartzell S.B. 153, avoid use of full reverse pitch.”

Compliance: By 30 October 1987.

Background: During the past several months the four bladed steel hub propeller fitted to Swearingen SA-226 series aircraft has experienced failure of the pitch change rod P/N B-3018S-2. Failure has occured during ground operation with application of full reverse pitch. Rod failure in this position will cause the propeller to travel deeper into reverse which could cause severe asymmetric thrust conditions or unacceptable engine overtemperature conditions.