Narrative:

I am a captain in a multi-jet corp flight department. On this day, I was flying with our assistant chief pilot. I was in the right seat. We were on the buzzy arrival to rdu to join the ILS 5R. From buzzy on, it appeared to me that the PF was less and less in control of the aircraft. When I would call to his attention that we were exceeding our assigned airspeed, for example, he would start to correct for that and lose the heading or altitude assigned. This started very subtly and gradually worsened as we approached the airport. I was continually talking to him just to keep us near close to heading and altitude. Airspeed was, at the latter stages of this incident, as much as 100 KTS over assigned. Due to the fact that we were over taking another aircraft, we were given a 90 degree left turn off the localizer to box around and try again. On initiating our turn, we entered a rapid, high speed descent (I was still talking). At 1300' below our assigned altitude, an abrupt, hard pull-up was made. The nose went to extreme pitch up and we very rapidly climbed to an altitude 700' above our assigned altitude. At this point I took the aircraft and began to ease the nose over. The PF then continued the recovery and we came around and did an acceptable approach. Our passenger were scared. The hard pull-up had, of course, resulted in very uncomfortable G forces. I believe that the PF was, for reasons I don't know, experiencing vertigo or some other incapacitating occurrence. I am not sure he even realizes that I took the aircraft for a few seconds. On the ground afterward, he would not discuss it, but acted normally in every way. The next day, after passenger complained and refused to get back on the aircraft, I have found out that the PF has told the chief pilot an out and out lie. I have not been asked. If I am, I will certainly tell the truth, but I will then have to leave the company. In the past, this assistant chief pilot has 'gotten even' with any captain or copilot that has run up against him, right or wrong.

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Original NASA ASRS Text

Title: CPR LTT LARGE SPEED, TRACK AND HEADING DEVIATIONS DUE TO UNEXPLAINED CAPT INCAPACITATION.

Narrative: I AM A CAPT IN A MULTI-JET CORP FLT DEPT. ON THIS DAY, I WAS FLYING WITH OUR ASSISTANT CHIEF PLT. I WAS IN THE RIGHT SEAT. WE WERE ON THE BUZZY ARR TO RDU TO JOIN THE ILS 5R. FROM BUZZY ON, IT APPEARED TO ME THAT THE PF WAS LESS AND LESS IN CTL OF THE ACFT. WHEN I WOULD CALL TO HIS ATTN THAT WE WERE EXCEEDING OUR ASSIGNED AIRSPD, FOR EXAMPLE, HE WOULD START TO CORRECT FOR THAT AND LOSE THE HDG OR ALT ASSIGNED. THIS STARTED VERY SUBTLY AND GRADUALLY WORSENED AS WE APCHED THE ARPT. I WAS CONTINUALLY TALKING TO HIM JUST TO KEEP US NEAR CLOSE TO HDG AND ALT. AIRSPD WAS, AT THE LATTER STAGES OF THIS INCIDENT, AS MUCH AS 100 KTS OVER ASSIGNED. DUE TO THE FACT THAT WE WERE OVER TAKING ANOTHER ACFT, WE WERE GIVEN A 90 DEG LEFT TURN OFF THE LOC TO BOX AROUND AND TRY AGAIN. ON INITIATING OUR TURN, WE ENTERED A RAPID, HIGH SPD DSNT (I WAS STILL TALKING). AT 1300' BELOW OUR ASSIGNED ALT, AN ABRUPT, HARD PULL-UP WAS MADE. THE NOSE WENT TO EXTREME PITCH UP AND WE VERY RAPIDLY CLBED TO AN ALT 700' ABOVE OUR ASSIGNED ALT. AT THIS POINT I TOOK THE ACFT AND BEGAN TO EASE THE NOSE OVER. THE PF THEN CONTINUED THE RECOVERY AND WE CAME AROUND AND DID AN ACCEPTABLE APCH. OUR PAX WERE SCARED. THE HARD PULL-UP HAD, OF COURSE, RESULTED IN VERY UNCOMFORTABLE G FORCES. I BELIEVE THAT THE PF WAS, FOR REASONS I DON'T KNOW, EXPERIENCING VERTIGO OR SOME OTHER INCAPACITATING OCCURRENCE. I AM NOT SURE HE EVEN REALIZES THAT I TOOK THE ACFT FOR A FEW SECS. ON THE GND AFTERWARD, HE WOULD NOT DISCUSS IT, BUT ACTED NORMALLY IN EVERY WAY. THE NEXT DAY, AFTER PAX COMPLAINED AND REFUSED TO GET BACK ON THE ACFT, I HAVE FOUND OUT THAT THE PF HAS TOLD THE CHIEF PLT AN OUT AND OUT LIE. I HAVE NOT BEEN ASKED. IF I AM, I WILL CERTAINLY TELL THE TRUTH, BUT I WILL THEN HAVE TO LEAVE THE COMPANY. IN THE PAST, THIS ASSISTANT CHIEF PLT HAS 'GOTTEN EVEN' WITH ANY CAPT OR COPLT THAT HAS RUN UP AGAINST HIM, RIGHT OR WRONG.

Data retrieved from NASA's ASRS site as of July 2007 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.