Narrative:

The trip involved a flight from santa fe; NM (saf) in a gulfstream G550. We had arrived saf two hours earlier from ZZZ and a line of thunderstorms was developing on the texas and new mexico border that extended to north dakota. Sitting on the ground; I used my ipad to plot the weather against our filed route (saf txo mqp ZZZ) and determined that if we flew the tafoy 2 departure to anton chico (ach) and then south to carlsbad (cnm) we could avoid all the weather. I discussed this with the PIC; and believed we had a plan that we both agreed to. To my surprise; abq center issued us a clearance of saf direct txo; but this overflies the TAFOY2 so I wasn't too concerned. After takeoff; we were cleared direct txo (103 degree track); but the pilot flying wouldn't turn on course. Weather radar showed no significant weather for about 100 miles but the PF (pilot flying) would not turn. He instead flew a heading of about 170 degrees and pointed the aircraft at blue sky that was visible. He also slowed the aircraft to 200 knots and climbed at 800 feet per minute. He kept asking me to request weather deviation from abq center; but center was unable to grant a deviation because we were below his minimum vectoring altitudes. Approximately 4-5 minutes into the flight; abq center issues two terrain safety alerts to us. We were at 10200 ft. And probably 15 miles south of the assigned IFR route near rapidly rising terrain. Luckily; we were VFR and the terrain was visible. The PF never made any effort to fly the assigned IFR route; nor did he climb at an optimum rate consistent with the operating characteristics of the aircraft. Being a former controller; it embarrasses me to have to try to explain his actions to ATC. He has been getting more and more reckless lately; but to deviate from an ATC clearance in mountainous terrain and fly a G550 like a cessna 172; he is now becoming dangerous to both his own aircraft and crew and to other using the air traffic system. I am in a difficult position; but this blatant disregard for the ATC rules and lack of basis airmanship has to cease.

Related reports:

Google
 

Original NASA ASRS Text

Title: G550 First Officer reported that the Captain failed to follow ATC clearances and flew in an unsafe manner.

Narrative: The trip involved a flight from Santa Fe; NM (SAF) in a Gulfstream G550. We had arrived SAF two hours earlier from ZZZ and a line of thunderstorms was developing on the Texas and New Mexico border that extended to North Dakota. Sitting on the ground; I used my iPad to plot the weather against our filed route (SAF TXO MQP ZZZ) and determined that if we flew the TAFOY 2 departure to Anton Chico (ACH) and then south to Carlsbad (CNM) we could avoid all the weather. I discussed this with the PIC; and believed we had a plan that we both agreed to. To my surprise; ABQ Center issued us a clearance of SAF direct TXO; but this overflies the TAFOY2 so I wasn't too concerned. After takeoff; we were cleared direct TXO (103 degree track); but the pilot flying wouldn't turn on course. Weather radar showed no significant weather for about 100 miles but the PF (pilot flying) would not turn. He instead flew a heading of about 170 degrees and pointed the aircraft at blue sky that was visible. He also slowed the aircraft to 200 knots and climbed at 800 feet per minute. He kept asking me to request weather deviation from ABQ Center; but Center was unable to grant a deviation because we were below his minimum vectoring altitudes. Approximately 4-5 minutes into the flight; ABQ Center issues two Terrain Safety Alerts to us. We were at 10200 ft. and probably 15 miles south of the assigned IFR route near rapidly rising terrain. Luckily; we were VFR and the terrain was visible. The PF never made any effort to fly the assigned IFR route; nor did he climb at an optimum rate consistent with the operating characteristics of the aircraft. Being a former controller; it embarrasses me to have to try to explain his actions to ATC. He has been getting more and more reckless lately; but to deviate from an ATC clearance in mountainous terrain and fly a G550 like a Cessna 172; he is now becoming dangerous to both his own aircraft and crew and to other using the air traffic system. I am in a difficult position; but this blatant disregard for the ATC rules and lack of basis airmanship has to cease.

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.