Narrative:

Upon selecting gear down; lcgiu 2 fault ECAM appeared -- the wheel page showed doors open but all three gear up -- this was consistent with the noise of the doors ajar. Checked gear handle fully down and attempted to recycle the gear -- the gear doors closed upon raising the handle but then same indications on second attempt. We executed a missed approach to work the problem. After reviewing the ECAM I went to the FM to review ECAM procedure and look for the gravity gear checklist. First officer flew and talked with ATC. Looked thru the ECAM checklist but indications of lgciu 1/2 fault did not seem appropriate. Reviewed the gear unsafe checklist and followed direction within that procedure to go to the gravity extend checklist. Gravity extend was successful and we got normal gear down indications on wheel page and above gear handle. We proceeded back towards airport and gave pertinent information to tower who had already called the equipment. Also accepted tower's offer to call the company for a tug (saving me from leaving the frequency or typing on ACARS). Informed the tower we would not be able to clear the runway and would have to stop on the runway after landing. In spite of status showing lgciu 2 and reverser 2 fault landing rollout was normal with reverser 2 operating normally (we briefed the potential for reverser 2 not working). Stopped without incident on the runway and company tug with mechanics pinned the gear before towing us to the gate. I made several announcements to inform the passengers and flight attendants that we had a minor problem and expected a normal landing with a full stop on the runway. Tower switched us to ground control where we confirmed aircraft; passenger and crew all ok. We performed after landing flows; started APU; and shut down the engines on runway while waiting for tug. All passengers remarkably positive during deplaning at the gate. Spoke with mechanic who towed us and he explained that the left nose gear door sensor for lgciu 1 had failed (showing not fully open) and was to blame for keeping the gear from deploying in spite of our ECAM lgciu 2 fault. I would like some feedback and follow-up on why a single sensor for one computer can inhibit all gear from unlocking/deploying. Did not elect to call for cabin advisory since gravity extension was successful. Firefighter came to jetway after event to debrief. She said they were trying to set up a discrete frequency to talk with us but was unable to get it effected prior to landing. Ground control was not busy and very helpful. We told ground when we shut down the engines and they relayed information between us and the fire trucks without any difficulty.

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Original NASA ASRS Text

Title: A319 LNDG GEAR FAILED TO EXTEND ON APCH. FLT CREW PERFORMED EMER EXTENSION AND LNDG WAS UNEVENTFUL.

Narrative: UPON SELECTING GEAR DOWN; LCGIU 2 FAULT ECAM APPEARED -- THE WHEEL PAGE SHOWED DOORS OPEN BUT ALL THREE GEAR UP -- THIS WAS CONSISTENT WITH THE NOISE OF THE DOORS AJAR. CHECKED GEAR HANDLE FULLY DOWN AND ATTEMPTED TO RECYCLE THE GEAR -- THE GEAR DOORS CLOSED UPON RAISING THE HANDLE BUT THEN SAME INDICATIONS ON SECOND ATTEMPT. WE EXECUTED A MISSED APPROACH TO WORK THE PROBLEM. AFTER REVIEWING THE ECAM I WENT TO THE FM TO REVIEW ECAM PROCEDURE AND LOOK FOR THE GRAVITY GEAR CHECKLIST. FO FLEW AND TALKED WITH ATC. LOOKED THRU THE ECAM CHECKLIST BUT INDICATIONS OF LGCIU 1/2 FAULT DID NOT SEEM APPROPRIATE. REVIEWED THE GEAR UNSAFE CHECKLIST AND FOLLOWED DIRECTION WITHIN THAT PROCEDURE TO GO TO THE GRAVITY EXTEND CHECKLIST. GRAVITY EXTEND WAS SUCCESSFUL AND WE GOT NORMAL GEAR DOWN INDICATIONS ON WHEEL PAGE AND ABOVE GEAR HANDLE. WE PROCEEDED BACK TOWARDS AIRPORT AND GAVE PERTINENT INFORMATION TO TOWER WHO HAD ALREADY CALLED THE EQUIPMENT. ALSO ACCEPTED TOWER'S OFFER TO CALL THE COMPANY FOR A TUG (SAVING ME FROM LEAVING THE FREQUENCY OR TYPING ON ACARS). INFORMED THE TOWER WE WOULD NOT BE ABLE TO CLEAR THE RUNWAY AND WOULD HAVE TO STOP ON THE RUNWAY AFTER LANDING. IN SPITE OF STATUS SHOWING LGCIU 2 AND REVERSER 2 FAULT LANDING ROLLOUT WAS NORMAL WITH REVERSER 2 OPERATING NORMALLY (WE BRIEFED THE POTENTIAL FOR REVERSER 2 NOT WORKING). STOPPED WITHOUT INCIDENT ON THE RUNWAY AND COMPANY TUG WITH MECHANICS PINNED THE GEAR BEFORE TOWING US TO THE GATE. I MADE SEVERAL ANNOUNCEMENTS TO INFORM THE PASSENGERS AND FLT ATTENDANTS THAT WE HAD A MINOR PROBLEM AND EXPECTED A NORMAL LANDING WITH A FULL STOP ON THE RUNWAY. TOWER SWITCHED US TO GROUND CONTROL WHERE WE CONFIRMED AIRCRAFT; PAX AND CREW ALL OK. WE PERFORMED AFTER LANDING FLOWS; STARTED APU; AND SHUT DOWN THE ENGINES ON RUNWAY WHILE WAITING FOR TUG. ALL PASSENGERS REMARKABLY POSITIVE DURING DEPLANING AT THE GATE. SPOKE WITH MECHANIC WHO TOWED US AND HE EXPLAINED THAT THE LEFT NOSE GEAR DOOR SENSOR FOR LGCIU 1 HAD FAILED (SHOWING NOT FULLY OPEN) AND WAS TO BLAME FOR KEEPING THE GEAR FROM DEPLOYING IN SPITE OF OUR ECAM LGCIU 2 FAULT. I WOULD LIKE SOME FEEDBACK AND FOLLOW-UP ON WHY A SINGLE SENSOR FOR ONE COMPUTER CAN INHIBIT ALL GEAR FROM UNLOCKING/DEPLOYING. DID NOT ELECT TO CALL FOR CABIN ADVISORY SINCE GRAVITY EXTENSION WAS SUCCESSFUL. FIREFIGHTER CAME TO JETWAY AFTER EVENT TO DEBRIEF. SHE SAID THEY WERE TRYING TO SET UP A DISCRETE FREQUENCY TO TALK WITH US BUT WAS UNABLE TO GET IT EFFECTED PRIOR TO LANDING. GROUND CONTROL WAS NOT BUSY AND VERY HELPFUL. WE TOLD GROUND WHEN WE SHUT DOWN THE ENGINES AND THEY RELAYED INFORMATION BETWEEN US AND THE FIRE TRUCKS WITHOUT ANY DIFFICULTY.

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.