Gulfstream G200 (IAI 1126 Galaxy)
Flight Crew Air Transport Pilot (ATP)
Flight Crew Last 90 Days 70; Flight Crew Total 13600; Flight Crew Type 6600
Training / Qualification
Aircraft Equipment Problem Less Severe; Deviation - Altitude Excursion From Assigned Altitude; Deviation / Discrepancy - Procedural Clearance; Deviation / Discrepancy - Procedural Published Material / Policy
Flight Crew Overcame Equipment Problem
Aircraft; Human Factors
While at FL380; we were advised we could get into ZZZ (our intended airport) from a change of second choice ZZZ1. ATC asked us to slow to slowest practical speed for sequencing and we complied to slow with MACH .64. Then; they asked us to make a 90 degree turn to the left. I did so on the auto pilot; but did not notice that the half bank was not working.  Halfway through the turn; the winglets started to slaughter; so I disconnected the auto pilot and leveled the wings off. As I was leveling; I noticed the right engine losing power and acting like a compressor stall. I applied full power and lowered the nose and [advised ATC]. Seconds later; the engine regained power and we notified ATC we were okay; they directed us back where the rest of the flight was normal and uneventful. Due to congested radio traffic; we descended 1;000 feet before we were able to [advise ATC] on the radio.
G200 corporate pilot reported engine stall during turn at high altitude resulting in altitude loss during recovery.