A321 flight crew reported a fume event during initial climb that necessitated an expedited diversion. The flight crew coordinated with ATC and the flight executed a safe overweight landing.
Synopsis
A321 flight crew reported a fume event during initial climb that necessitated an expedited diversion. The flight crew coordinated with ATC and the flight executed a safe overweight landing.
Narrative
During initial climb we experienced a fume event which was noticed by all crew and passengers. FO (First Officer) and I agreed that a landing was necessary and due to it being an overweight landing; we agreed that ZZZ was the appropriate choice of airports because of its long runways. We coordinated with ATC and set the aircraft up for the diversion where we executed an overweight landing. Touchdown was performed smoothly and we were advised that no MX (Maintenance) write up was required due to the descent rate at touchdown being less than 100' fpm. Captain performed the landing. No emergency was declared as I believed that the situation was being addressed in a precautionary manner. I'm now aware that emergency should have been declared as required by company policy. That failure rests upon my shoulders. Most likely there was oil or hydraulic fluid which ingested into the air conditioning system. I'm not an A&P but that is my best guess. These are random events and the fumes issue is known about by Airbus Industries and Airbus operators.
Second reporter narrative
On the initial climb out of ZZZ1 we had strong fumes enter the cockpit and cabin quickly. CA (Captain) was right away very concerned about potential toxicity and health effects and wanted to divert. I flew the aircraft; called for the Auto Pilot; and after take-off checklist. I shared his concerns to a lesser degree but agreed that a diversion to ZZZ was the safest and best option. CA talked to the Flight Attendants and Passengers and then requested to divert from ATC. He asked for a precautionary landing; declining ATC inquiry of emergency. The intensity of the fumes gradually subsided; but the odor and taste still lingered. Then we discussed and prepared for a nonroutine overweight landing. I continued to fly the aircraft; set up the approach; and talked to ATC. CA consulted the QRH (Quick Reference Handbook) and talked to Flight Attendants and Passengers again. Once ready; we switched controls to the Captain for the approach and smooth landing. After I reviewed the QRH at the gate; I realized that an emergency should have been declared. Airbus fume events are well documented. A list of ATC emergency declaration required in QRH.
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Source: NASA Aviation Safety Reporting System (public domain). Reports are voluntary submissions and are not verified by NASA.