AN MD80 RUDDER CTL VALVE HYD CHK VALVE WAS INSTALLED BACKWARDS LOCKING UP THE RUDDER ON GND TEST.

Narrative

ON 00/07/FRI; I REPLACED THE CHK VALVE FOR THE DIRECTIONAL CTL VALVE FOR THE RUDDER. I HAVE SINCE BECOME AWARE OF THE FACT THAT IT WAS INSTALLED BACKWARDS. AS FOR THE SIGN OFF; IT WAS LEAKED CHKED AND I INADVERTENTLY ALSO WROTE OPS CHK GOOD. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: THE RPTR STATED WHEN HE WAS GIVEN THE ASSIGNMENT TO REPLACE THE CHK VALVE AN OLD TIME EMPLOYEE GAVE ME THE CHK VALVE WITH A SHORT PIECE OF TUBING ATTACHED AND SAID; 'IT GOES IN JUST LIKE THIS'. THE RPTR CHKED THE MNTNC MANUAL; BUT NO PROC DESCRIBED THE VALVE REPLACEMENT. THE RPTR SAID THE VALVE WAS REPLACED AND ON AN OP CHK OF THE RUDDER LOCKED UP WITH NO MOVEMENT. THE RPTR STATED THE CHK VALVE WAS REVERSED AND OP WAS NORMAL. THE RPTR SAID SEVERAL THINGS WERE DISCOVERED; THE VALVE BODY HAD NO CAST IN DIRECTION OF FLOW ARROW AND THE TUBE FITTINGS WERE THE SAME ON BOTH ENDS OF THE VALVE. THE RPTR STATED THE MNTNC MANUAL HAD NO PROC FOR THIS VALVE REPLACEMENT. THE RPTR SAID THIS WHOLE TASK WAS NOT 'MURPHY PROOF'. THE RPTR SAID CORRECTIONS FOR REVISING THE MNTNC MANUAL AND ALL CLASS 1 DOCUMENTS PERTAINING TO THIS CHK VALVE WERE SUBMITTED TO ENGINEERING.