Narrative:

The PIC takes full responsibility for this event. This was an embarrassment to [our company] and to the pilots involved. The crew did their descent checks briefing which included tuning up the NDB and both sides had their respective NDB needle up. They even made a 'place bearing distance' (pbd) fix at 5miles at 3'500 feet at the end of the runway. On the descent into ZZZ1; descending through approximately 38;000 feet the amber cabin altitude cas message came on and so both pilots don their mask. The cabin altitude was steady at approximately 8;500 feet and the crew stated to ATC that they wanted to keep descending due to a pressurization issue. ATC asked the pilots if they wanted to declare an emergency and they declined since the cabin was stabilized at 8;500 feet. The pilots were then given a different fix to fly to. They were filed to ZZZ but were given direct ZZZ VOR direct ZZZ1 plus they were also given a crossing restriction. Which I believe was to cross 15miles west of ZZZ1 at or below 14000 cleared to 9000. The nonflying pilot was busy reading the checklist and flying pilot was flying the aircraft and on the radio. The amber cabin altitude message went out as they descend through 25;000 feet. ATC told them the airport was at their 11 o'clock and so they had an airport in sight. The wind was reporting at ZZZ1 230/13g16kts. The wind vector display on the FMS showed a steady cross wind of 18kts while on final and so flying pilot had his hands full. The flying pilot saw the runway numbers 30 and landed the aircraft safely. Once they taxied clear of the runway the pilots had difficulty reaching the FBO. That's when they realized that they landed at the wrong airport and landed at ZZZ2. The PIC informed the passengers of the mistake and they decided to reroute their transportation. It was a combination of multiple factors that lead to this mistake: maintenance issue (cabin altitude cas message); multiple ATC instructions while running through an abnormal checklist; 2 airports near each other lined up in the same magnetic direction; large inviting runway in the same general location where ATC says it's located; and a strong crosswind that needed visual cues to land the aircraft safely. Task saturation was a large culprit to this error and again; the PIC takes full responsibility for this event. This never should have happened nor will it again. The pilots should have declared emergency and they would have received preferential treatment. They should have encompassed geographical clues about the airport ZZZ1 during the briefing. The flying pilot should have used his instrumental cues to align himself up to the correct runway/airport.

Google
 

Original NASA ASRS Text

Title: Citation 750 flight crew reported a pressurization malfunction and requested priority handling from ATC to their destination airport. While dealing with the malfunction they accidently landed at the wrong airport.

Narrative: The PIC takes full responsibility for this event. This was an embarrassment to [Our Company] and to the pilots involved. The crew did their descent checks briefing which included tuning up the NDB and both sides had their respective NDB needle up. They even made a 'Place Bearing Distance' (PBD) fix at 5miles at 3'500 feet at the end of the runway. On the descent into ZZZ1; descending through approximately 38;000 feet the amber Cabin Altitude CAS message came on and so both pilots DON their mask. The cabin altitude was steady at approximately 8;500 feet and the crew stated to ATC that they wanted to keep descending due to a pressurization issue. ATC asked the pilots if they wanted to declare an emergency and they declined since the cabin was stabilized at 8;500 feet. The pilots were then given a different fix to fly to. They were filed to ZZZ but were given direct ZZZ VOR direct ZZZ1 plus they were also given a crossing restriction. Which I believe was to cross 15miles west of ZZZ1 at or below 14000 cleared to 9000. The nonflying pilot was busy reading the checklist and flying pilot was flying the aircraft and on the radio. The amber Cabin Altitude message went out as they descend through 25;000 feet. ATC told them the airport was at their 11 o'clock and so they had an airport in sight. The wind was reporting at ZZZ1 230/13G16KTS. The wind vector display on the FMS showed a steady cross wind of 18kts while on final and so flying pilot had his hands full. The flying pilot saw the runway numbers 30 and landed the aircraft safely. Once they taxied clear of the runway the pilots had difficulty reaching the FBO. That's when they realized that they landed at the wrong airport and landed at ZZZ2. The PIC informed the passengers of the mistake and they decided to reroute their transportation. It was a combination of multiple factors that lead to this mistake: Maintenance issue (cabin altitude CAS message); multiple ATC instructions while running through an abnormal checklist; 2 airports near each other lined up in the same magnetic direction; large inviting runway in the same general location where ATC says it's located; and a strong crosswind that needed visual cues to land the aircraft safely. Task saturation was a large culprit to this error and again; the PIC takes full responsibility for this event. This never should have happened nor will it again. The pilots should have declared emergency and they would have received preferential treatment. They should have encompassed geographical clues about the airport ZZZ1 during the briefing. The flying pilot should have used his instrumental cues to align himself up to the correct runway/airport.

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.