Citation II S2/Bravo (C550)
Flight Crew Multiengine; Flight Crew Air Transport Pilot (ATP); Flight Crew Flight Instructor; Flight Crew Instrument
Flight Crew Last 90 Days 35; Flight Crew Total 4200; Flight Crew Type 15
Workload; Distraction; Fatigue; Situational Awareness
Aircraft Equipment Problem Critical; Aircraft Equipment Problem Less Severe; Deviation - Altitude Crossing Restriction Not Met; Deviation - Altitude Excursion From Assigned Altitude; Deviation / Discrepancy - Procedural Clearance
Flight Crew Became Reoriented
Human Factors; Procedure; Aircraft
Approximately 25 minutes before the altitude deviation occurred; the aircraft suffered loss of cabin altitude from FL330. After completing all checklist and memory items the trip continues normally. Upon reaching TEB airspace the crew was still a bit overwhelmed from the events that had previously occurred. Approach gave us a heading and a descent down to 2;000 ft. The aircraft was turned to the proper heading yet the altitude did not properly capture allowing the aircraft to continue decent down to 1500 ft. before it was fought by the crew. Whilst this decent was occurring the cure was making final adjustments for the aircraft to be set up to cross DANDY intersection at 1;500 ft. and it was made apparent that the Co-Pilot's side HSI had become inoperative. When the altitude deviation was caught by the crew; immediate corrective actions were taken yet approach issued an altitude warning. Contributing factors included crew fatigue from just completing a rapid decent due to loss of cabin pressure. During the course of this action judgment was affected because the crew was still excited from the previous events that transpired.
First Officer reported altitude deviation following loss of cabin pressure.