AN A319 CREW FELT A BUMP FOLLOWED BY AN ECAM ELEVATOR AILERON COMPUTER #1 FAULT. AFTER COMPLETING THE ECAM PROC THE CREW NOTED AN ECAM AND CHKLIST PROCEDURAL DIFFERENCE.

Date: 2005-06 · Aircraft: A319

Anomalies: aircraft-equipment-problem-less-severe|other-procedural-interpretation

Synopsis

AN A319 CREW FELT A BUMP FOLLOWED BY AN ECAM ELEVATOR AILERON COMPUTER #1 FAULT. AFTER COMPLETING THE ECAM PROC THE CREW NOTED AN ECAM AND CHKLIST PROCEDURAL DIFFERENCE.

Narrative

CLBING THROUGH 10000 FT; CLR SKIES AND VERY SMOOTH AIR; FELT AN UNCOMMON 'BUMP' (LIKE UNEXPECTED WAKE TURB; EXCEPT THERE WERE NO OTHER ACFT ANYWHERE NEAR US). A MOMENT LATER; WE RECEIVED AN ECAM FOR ELEVATOR AILERON COMPUTER #1 FAULT. WE FOLLOWED THE ECAM PROCS BY CYCLING THE ELEVATOR AILERON COMPUTER #1 SWITCH OFF; THEN ON. WE THEN REFED THE BOOK TO FOLLOW UP. IN THE BOOK; THERE IS A NOTE THAT SAYS IF THERE IS ANY UNCOMMANDED FLT CTL PROBS; TO NOT RESET THE ELEVATOR AILERON COMPUTER SWITCHES. THIS NOTE WAS NOT ON THE ECAM PROCS; SO THE NOTE WAS MOOT. SEEMS TO ME THAT WE FOLLOWED THE ECAM PROCS; BUT IN THIS SITUATION; IT WAS NOT THE RIGHT THING TO DO. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: RPTR STATED THAT THE 'BUMP' WAS NOTICEABLE BUT PRODUCED ONLY SLIGHT ACFT MOVEMENT. HE WOULD NOT CONSIDER IT TO BE AN ATTITUDE CHANGE OR ANY MOVEMENT THAT WOULD APCH BEING UNCOMFORTABLE FOR THE CREW OR PAX. THE RPTR'S CONCERN WAS THAT HIS ACR TEACHES THAT THE FLT CREW WILL FOLLOW THE ECAM PROC COMPLETELY THEN REFER TO THE BOOK. WHEN HE REFERRED TO THE BOOK; HE QUESTIONED WHETHER HE SHOULD HAVE COMPLETED THE ECAM BECAUSE OF THE 'BUMP.' A CLRER EXPLANATION IN THE MANUAL OF AN 'UNCOMMANDED MANEUVER' VERSUS A 'BUMP' WOULD ALLEVIATE THE AMBIGUITY.

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Source: NASA Aviation Safety Reporting System (public domain). Reports are voluntary submissions and are not verified by NASA.