Narrative:

While performing rvsm modification, I was reviewing the paperwork to confirm and familiarize myself with the modification requirements. Meanwhile, my partner was retrieving the air data computers required to comply with the modification. Once I had familiarized myself with what steps I was going to follow, I proceeded to commence the removal of the #2 air data computer. At that time my partner returned to the aircraft and told me that there was only 1 computer in stock, meaning that we would not be able to comply with the modification. I had already twisted the quick disconnect when my partner had told me the news. I resecured the quick disconnect on the pitot line, gathered my tools, turned off the light and closed the east&east access door. Callback conversation with reporter revealed the following information: the reporter stated the aircraft was a B757-200 and shortly after pushback the aircraft taxied back to the gate with all system connected to the #2 air data computer inoperative. The reporter said the pitot line quick disconnect was found disconnected from the #2 air data computer. The reporter stated that he remembers disconnecting the quick disconnect fitting but cannot recall reconnecting the fitting. The reporter stated the FAA has made no contact.

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Original NASA ASRS Text

Title: A B757-200 AFTER PUSHBACK RETURNED TO THE GATE DUE TO ALL SYS CONNECTED TO THE #2 AIR DATA COMPUTER WERE INOP CAUSED BY THE PITOT LINE DISCONNECTED.

Narrative: WHILE PERFORMING RVSM MODIFICATION, I WAS REVIEWING THE PAPERWORK TO CONFIRM AND FAMILIARIZE MYSELF WITH THE MODIFICATION REQUIREMENTS. MEANWHILE, MY PARTNER WAS RETRIEVING THE AIR DATA COMPUTERS REQUIRED TO COMPLY WITH THE MODIFICATION. ONCE I HAD FAMILIARIZED MYSELF WITH WHAT STEPS I WAS GOING TO FOLLOW, I PROCEEDED TO COMMENCE THE REMOVAL OF THE #2 AIR DATA COMPUTER. AT THAT TIME MY PARTNER RETURNED TO THE ACFT AND TOLD ME THAT THERE WAS ONLY 1 COMPUTER IN STOCK, MEANING THAT WE WOULD NOT BE ABLE TO COMPLY WITH THE MODIFICATION. I HAD ALREADY TWISTED THE QUICK DISCONNECT WHEN MY PARTNER HAD TOLD ME THE NEWS. I RESECURED THE QUICK DISCONNECT ON THE PITOT LINE, GATHERED MY TOOLS, TURNED OFF THE LIGHT AND CLOSED THE E&E ACCESS DOOR. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: THE RPTR STATED THE ACFT WAS A B757-200 AND SHORTLY AFTER PUSHBACK THE ACFT TAXIED BACK TO THE GATE WITH ALL SYS CONNECTED TO THE #2 AIR DATA COMPUTER INOP. THE RPTR SAID THE PITOT LINE QUICK DISCONNECT WAS FOUND DISCONNECTED FROM THE #2 AIR DATA COMPUTER. THE RPTR STATED THAT HE REMEMBERS DISCONNECTING THE QUICK DISCONNECT FITTING BUT CANNOT RECALL RECONNECTING THE FITTING. THE RPTR STATED THE FAA HAS MADE NO CONTACT.

Data retrieved from NASA's ASRS site as of July 2007 and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.