Narrative:

Aircraft XXX air returned due to losing captain's airspeed and altimeter. I found left pitot air data module to be failed (hard fault). Removed and replaced same. I performed tests per amm and fim; reference log page XXX. Inspection verified quick disconnect fitting; reference log page XXX per general manual XXX general procedures. By not reading past the general requirements for pitot/static leak checks in general manual XXX; I failed to do a system leak check for air returns per general manual step 4. Action taken to correct this: shift manager/maintenance control contacted line maintenance to perform required leak/pressure check; same night. Supplemental information from acn 808916: I was called to aircraft XXX by avionics to work an rii item at the gate. I met with XXX and he needed for me to look at the left pitot air data module quick disconnect fitting. I inspected it for being properly seated and locked. I checked the gmm under chapter 34; navigation/pitot static system. It said for quick disconnect fittings is not required. At this time I believe I have accomplished all the required instructions and sign the log page. Later that night about XA00; I was told by my supervisor and shift manager that a leak check was required for air returns. Since the gmm rii list chapter 34 does not say anything for PIREPS of that area being an rii item; I believed I did not have to deal with that write-up. I also point out in the gmm leak test says-- excluding disconnect; so at this point you would believe you accomplished your instruction.

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Original NASA ASRS Text

Title: A MECHANIC AND INSPECTOR REPORT ABOUT A REQUIRED PITOT/STATIC SYSTEM LEAK CHECK THAT WAS NOT PERFORMED; AFTER AN AIR TURNBACK OF A B737-800 AIRCRAFT; DUE TO LOSING CAPTAIN'S AIRSPEED AND ALTIMETER.

Narrative: ACFT XXX AIR RETURNED DUE TO LOSING CAPT'S AIRSPD AND ALTIMETER. I FOUND L PITOT AIR DATA MODULE TO BE FAILED (HARD FAULT). REMOVED AND REPLACED SAME. I PERFORMED TESTS PER AMM AND FIM; REF LOG PAGE XXX. INSPECTION VERIFIED QUICK DISCONNECT FITTING; REF LOG PAGE XXX PER GENERAL MANUAL XXX GENERAL PROCS. BY NOT READING PAST THE GENERAL REQUIREMENTS FOR PITOT/STATIC LEAK CHKS IN GENERAL MANUAL XXX; I FAILED TO DO A SYS LEAK CHK FOR AIR RETURNS PER GENERAL MANUAL STEP 4. ACTION TAKEN TO CORRECT THIS: SHIFT MGR/MAINT CTL CONTACTED LINE MAINT TO PERFORM REQUIRED LEAK/PRESSURE CHK; SAME NIGHT. SUPPLEMENTAL INFO FROM ACN 808916: I WAS CALLED TO ACFT XXX BY AVIONICS TO WORK AN RII ITEM AT THE GATE. I MET WITH XXX AND HE NEEDED FOR ME TO LOOK AT THE L PITOT AIR DATA MODULE QUICK DISCONNECT FITTING. I INSPECTED IT FOR BEING PROPERLY SEATED AND LOCKED. I CHKED THE GMM UNDER CHAPTER 34; NAVIGATION/PITOT STATIC SYS. IT SAID FOR QUICK DISCONNECT FITTINGS IS NOT REQUIRED. AT THIS TIME I BELIEVE I HAVE ACCOMPLISHED ALL THE REQUIRED INSTRUCTIONS AND SIGN THE LOG PAGE. LATER THAT NIGHT ABOUT XA00; I WAS TOLD BY MY SUPVR AND SHIFT MGR THAT A LEAK CHK WAS REQUIRED FOR AIR RETURNS. SINCE THE GMM RII LIST CHAPTER 34 DOES NOT SAY ANYTHING FOR PIREPS OF THAT AREA BEING AN RII ITEM; I BELIEVED I DID NOT HAVE TO DEAL WITH THAT WRITE-UP. I ALSO POINT OUT IN THE GMM LEAK TEST SAYS-- EXCLUDING DISCONNECT; SO AT THIS POINT YOU WOULD BELIEVE YOU ACCOMPLISHED YOUR INSTRUCTION.

Data retrieved from NASA's ASRS site as of May 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.