Narrative:

Fuel imbalance advisory; initial climb. Fuel page pop-up on lower display; without ECAM (electronic centralized aircraft monitor).initial climb departing ZZZ to ZZZ1. Imbalance indicated between tanks L6+; R8+.normal all pumps on; cross-feed closed. Tank feeding each engine. Release fuel was 16.1. Question is do you believe the quantities display? Tanks added to a reasonable total; reference release fuel. Could not justify imbalance due to a trend; leak etc. Ca (captain) as pm (pilot monitoring); decision to cross-feed re-balance during climb. Correct system response would determine if continued flight was indicated or divert as soon as possible before imbalance/non ECAM problem worsened. Cross-feed re-balance corrected imbalance and arrival at ZZZ1 with correct flight planned fuel and balanced. Crew recollection is of checking fuel on preflight; but maybe due to refueling still in progress; if imbalance was indicated; did not notice final imbalance; as we assume created the event. Post flight info; fuel slip indicated L8.0 + R8.0 = release fuel (ca called ZZZ ops supr (operations supervisor); to inquire of what fueling slip indicated)). Gate shutdown post flight called maintenance operations to relay events and inquire about aml inspection/entry. Advised systems functioned correctly. Later; after calling ZZZ ops and learning of fuel slip entries; called 320 fleet manager with the event details and conflicting information. He informed of some rare probe indication problems and would follow-up this event. Question; if imbalance after start indicated above lower takeoff limitation....why would ab wait to advise until climb? In flight much higher limitations! One tank feeding each engine; subsequent instant big imbalance improbable? Crew missed imbalance after late refueling or fuel slip recorded L8+R8; if correct; sensors reported incorrectly until airborne? Personally check bleed page post-start; due to ab anomaly's that amber indications can be present without crew notification. Experienced a pack flow control valve amber after start and continued single pack operation; without ECAM or inoperative (inoperative) status messages. This previous event discovered during FL390 (39;000 ft) cruise system checks; told was a logic protection normal function; ab was within limitations? Precautionary; descended to FL310 in accordance with (in accordance with) single pack dispatch guidance. Training cka (check airmen) know of these anomaly's; recommended SOP (standard operating procedure); after start system page check! Double that recommendation.

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Original NASA ASRS Text

Title: Flight Crew flying A321 observed fuel imbalance inflight.

Narrative: Fuel Imbalance Advisory; Initial Climb. Fuel Page pop-up on lower display; without ECAM (Electronic Centralized Aircraft Monitor).Initial Climb departing ZZZ to ZZZ1. Imbalance indicated between tanks L6+; R8+.Normal all pumps on; cross-feed closed. Tank feeding each engine. Release fuel was 16.1. Question is do you believe the quantities display? Tanks added to a reasonable total; reference Release fuel. Could not justify imbalance due to a trend; leak etc. CA (Captain) as PM (Pilot Monitoring); decision to cross-feed re-balance during climb. Correct system response would determine if continued flight was indicated or divert ASAP before imbalance/Non ECAM problem worsened. Cross-feed re-balance corrected imbalance and arrival at ZZZ1 with correct flight planned fuel and balanced. Crew recollection is of checking fuel on preflight; but maybe due to refueling still in progress; if Imbalance was indicated; did not notice final imbalance; as we assume created the event. Post flight info; fuel slip indicated L8.0 + R8.0 = Release fuel (CA called ZZZ Ops Supr (Operations Supervisor); to inquire of what fueling slip indicated)). Gate shutdown post flight called Maintenance Operations to relay events and inquire about AML inspection/entry. Advised systems functioned correctly. Later; after calling ZZZ Ops and learning of fuel slip entries; called 320 Fleet Manager with the event details and conflicting Information. He informed of some rare probe indication problems and would follow-up this event. Question; if imbalance after start indicated above lower takeoff limitation....why would AB wait to advise until climb? In flight much higher limitations! One tank feeding each engine; subsequent instant big imbalance improbable? Crew missed imbalance after late refueling or fuel slip recorded L8+R8; if correct; sensors reported incorrectly until airborne? Personally check bleed page post-start; due to AB anomaly's that amber indications can be present without crew notification. Experienced a pack flow control valve amber after start and continued single pack operation; without ECAM or INOP (Inoperative) status messages. This previous event discovered during FL390 (39;000 ft) cruise system checks; told was a logic protection normal function; AB was within limitations? Precautionary; descended to FL310 IAW (In Accordance With) single pack Dispatch guidance. Training CKA (Check Airmen) know of these anomaly's; recommended SOP (Standard Operating Procedure); after start system page check! Double that recommendation.

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.