Narrative:

FAA letter of investigation indicates that I failed to receive an rii signoff on the installation of the air data computer removal and installation. I was sent by maintenance control and my supervisor to ZZZ to recover aircraft X requiring the installation of the #1 air data computer. I was advised it only required a land verify test. (On-call) maintenance was on the site and was going to install it but was unable to verify the CAT status. When I arrived; the part was there and (on call) maintenance had left. I had the right&right paperwork from the maintenance manual along with the test paperwork and performed right&right test. Notified maintenance control that I performed right&right and test and the aircraft had passed. Facsimile the paperwork to maintenance control for (computer system) entry. Callback conversation with reporter revealed the following information: the reporter stated the air data computer was replaced at an off-line non maintenance station. The inspection that was not performed is a gpm check of the air data computer quick disconnect static and pitot fittings for being installed. Since the reporter was working the job alone; no one else was available or qualified to check the fittings. The pitot and static system was checked per the maintenance manual and found not leaking.

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Original NASA ASRS Text

Title: A B737-300 HAD THE #1 ADC REPLACED AT A NON MAINT STATION. TECHNICIAN REPLACED COMPUTER AND TESTED PER THE MAINT MANUAL.

Narrative: FAA LETTER OF INVESTIGATION INDICATES THAT I FAILED TO RECEIVE AN RII SIGNOFF ON THE INSTALLATION OF THE ADC REMOVAL AND INSTALLATION. I WAS SENT BY MAINT CTL AND MY SUPVR TO ZZZ TO RECOVER ACFT X REQUIRING THE INSTALLATION OF THE #1 ADC. I WAS ADVISED IT ONLY REQUIRED A LAND VERIFY TEST. (ON-CALL) MAINT WAS ON THE SITE AND WAS GOING TO INSTALL IT BUT WAS UNABLE TO VERIFY THE CAT STATUS. WHEN I ARRIVED; THE PART WAS THERE AND (ON CALL) MAINT HAD LEFT. I HAD THE R&R PAPERWORK FROM THE MAINT MANUAL ALONG WITH THE TEST PAPERWORK AND PERFORMED R&R TEST. NOTIFIED MAINT CTL THAT I PERFORMED R&R AND TEST AND THE ACFT HAD PASSED. FAX THE PAPERWORK TO MAINT CTL FOR (COMPUTER SYS) ENTRY. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: THE RPTR STATED THE ADC WAS REPLACED AT AN OFF-LINE NON MAINT STATION. THE INSPECTION THAT WAS NOT PERFORMED IS A GPM CHK OF THE ADC QUICK DISCONNECT STATIC AND PITOT FITTINGS FOR BEING INSTALLED. SINCE THE RPTR WAS WORKING THE JOB ALONE; NO ONE ELSE WAS AVAILABLE OR QUALIFIED TO CHK THE FITTINGS. THE PITOT AND STATIC SYS WAS CHKED PER THE MAINT MANUAL AND FOUND NOT LEAKING.

Data retrieved from NASA's ASRS site as of January 2009 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.