Narrative:

After departure; following gear retraction; we noticed a louder than normal airflow-like noise in the cockpit; accompanied by a very light rumbling. We looked over the forward panel and upper and lower ECAM . Everything looked normal. We also looked periodically through the ECAM system pages. Nothing out of the ordinary. Contacted dispatch via ACARS text; and wrote that we had a slight rumbling along with some noise. Nothing indicative of a problem. As we neared [an] intersection; we were told by controller to contact [commercial radio]. Shortly thereafter; we lost our vhf and ACARS; however we were aware that we could use HF to get info to our dispatcher. Prior to coasting out; I told the dispatcher that there weren't any indications of any problems. We were around 2 1/2 hours late; and felt that the ground crew had left an access panel open. We concurred with dispatch and moc that if no problem exists; we can fly at .76/FL320 (conflicting traffic at our planned cruise of FL360). We also noted that our projected fuel at [the intersection] was within 300 pounds. We incurred a long sit on the ground; so this slightly excess burn seemed plausible. The last message we received before coasting out said to the effect if you feel comfortable at .76/FL320 that is ok; if any doubts; then we would have to establish a new plan.at top of climb; I conducted ECAM system checks; paging through the system pages and noted nothing unusual. I kept a fuel log; and noted that we were within about 500 lbs of planned burn during the early part of the flight. This increased to 700 later over [another fix]; but I think we were in radar contact I believe by that time.about halfway through the flight; I asked the flight attendants (flight attendant) if they heard anything or felt anything unusual. They said that they did not. I told them that we had a lot of noise and a slight rumbling up in the cockpit; but no other indications. I made my first logbook entry while still out of radio contact: 'after takeoff and at all times during flight; light rumbling and loud noise in cockpit. Fwd galley flight attendant did not hear anything.' we still believed the source to be an open panel at this time.as we neared land; we began to catch up with the ACARS messages that were interrupted after our departure from ZZZZ. Dispatcher recommended I fill out a vibration report. I began to do that. I had conducted at least 2 other ECAM system flows and noted nothing irregular on either one of these. Dispatcher asked if we needed anything; and I said that we were just fine. About 200 miles from [destination]; and after several messages to dispatch; I conducted another ECAM systems check; feeling very confident it was only an open access panel. When I came to the wheel page; I noticed 4 amber x's above the nosegear. This was the first time we had seen anything abnormal. We slowed the aircraft down to .67M/280 KIAS; notified ATC. We entered the discrepancy in logbook.ATC was aware of our situation; but we elected to treat it as a normal procedure unless the gear would not extend/lock. The gear came down with normal indications. We landed; taxied to the gate and everything was normal up to that point. At shutdown; we received the only ECAM message during the entire flight: left/G system disagree. We entered that in logbook; and maintenance was waiting for us when the door opened.

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Original NASA ASRS Text

Title: A320 Captain reported noticing slight vibration after takeoff; and later in the flight received the ECAM message L/G SYS DISAGREE. Approach and landing were normal.

Narrative: After departure; following gear retraction; we noticed a louder than normal airflow-like noise in the cockpit; accompanied by a very light rumbling. We looked over the forward panel and upper and lower ECAM . Everything looked normal. We also looked periodically through the ECAM system pages. Nothing out of the ordinary. Contacted dispatch via ACARS text; and wrote that we had a slight rumbling along with some noise. Nothing indicative of a problem. As we neared [an] intersection; we were told by controller to contact [Commercial Radio]. Shortly thereafter; we lost our vhf and ACARS; however we were aware that we could use HF to get info to our dispatcher. Prior to coasting out; I told the dispatcher that there weren't any indications of any problems. We were around 2 1/2 hours late; and felt that the ground crew had left an access panel open. We concurred with dispatch and MOC that if no problem exists; we can fly at .76/FL320 (conflicting traffic at our planned cruise of FL360). We also noted that our projected fuel at [the intersection] was within 300 pounds. We incurred a long sit on the ground; so this slightly excess burn seemed plausible. The last message we received before coasting out said to the effect if you feel comfortable at .76/FL320 that is ok; if any doubts; then we would have to establish a new plan.At top of climb; I conducted ECAM system checks; paging through the system pages and noted nothing unusual. I kept a fuel log; and noted that we were within about 500 lbs of planned burn during the early part of the flight. This increased to 700 later over [another fix]; but I think we were in radar contact I believe by that time.About halfway through the flight; I asked the Flight Attendants (FA) if they heard anything or felt anything unusual. They said that they did not. I told them that we had a lot of noise and a slight rumbling up in the cockpit; but no other indications. I made my first logbook entry while still out of radio contact: 'After Takeoff and at all times during flight; light rumbling and loud noise in cockpit. FWD Galley FA did not hear anything.' We still believed the source to be an open panel at this time.As we neared land; we began to catch up with the ACARS messages that were interrupted after our departure from ZZZZ. Dispatcher recommended I fill out a vibration report. I began to do that. I had conducted at least 2 other ECAM system flows and noted nothing irregular on either one of these. Dispatcher asked if we needed anything; and I said that we were just fine. About 200 miles from [Destination]; and after several messages to dispatch; I conducted another ECAM systems check; feeling very confident it was only an open access panel. When I came to the WHEEL page; I noticed 4 amber x's above the nosegear. This was the first time we had seen anything abnormal. We slowed the aircraft down to .67M/280 KIAS; notified ATC. We entered the discrepancy in logbook.ATC was aware of our situation; but we elected to treat it as a normal procedure unless the gear would not extend/lock. The gear came down with normal indications. We landed; taxied to the gate and everything was normal up to that point. At shutdown; we received the only ECAM message during the entire flight: L/G SYS DISAGREE. We entered that in logbook; and maintenance was waiting for us when the door opened.

Data retrieved from NASA's ASRS site 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.