Narrative:

While acting as the PNF (first officer) of a twin engine turboprop commuter aircraft on a far part 135 flight from modesto, ca, to san jose, ca, I observed the PF (captain) execute an abrupt and unusual rolling maneuver. The stated reason for executing this maneuver was to avoid an aircraft approaching from the 10 O'clock position. He said the aircraft was level and coming right at us. I did not see this aircraft until it was pointed out to me by the captain approximately 6-8 seconds after he returned the aircraft to wings level upright flight. At that time the aircraft was 2-3 mi at our 3 O'clock position and going away. The aircraft was a low wing type or type, white in color. The aircraft was also about 500 ft or more below us. In my judgement the maneuver the captain used was unnecessary to avoid the other aircraft. There were no revenue passenger onboard the aircraft but there was a jumpseating pilot (also a captain) who is a company pilot he was seated in row 6 and was not on headset intercom. Since the maneuver the captain performed exceeded 60 degrees of bank, and included going through the inverted position. I reminded him that this was considered an aerobatic maneuver and as such is prohibited. I also asked the captain if he wanted to declare a near miss with stockton approach. His response was negative. The flight was continued to san jose without incident where I conducted a thorough post-flight. Although no damage to the aircraft was observed I suggested the captain ground the aircraft and advise company officials. The captain did not ground the aircraft and did not report the incident to company officials. After conferring with pilot union officials, I, the first officer, reported the incident to the chief pilot. The aircraft was subsequently grounded. Both the captain and I were immediately suspended. The captain resigned 48 hours after the incident while I am waiting the outcome of a company investigation. The captain performed an unauthorized, unannounced, prohibited maneuver with the aircraft and did not report the incident to company flight management officials. The aircraft is currently grounded being thoroughly inspected by qualified maintenance personnel. The captain is no longer with the company. I feel I fulfilled my responsibilities as a first officer by reporting this incident to company officials.

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Original NASA ASRS Text

Title: COMMUTER SMT CAPT DOES AN EXTREME MANEUVER ON FERRY FLT.

Narrative: WHILE ACTING AS THE PNF (FO) OF A TWIN ENG TURBOPROP COMMUTER ACFT ON A FAR PART 135 FLT FROM MODESTO, CA, TO SAN JOSE, CA, I OBSERVED THE PF (CAPT) EXECUTE AN ABRUPT AND UNUSUAL ROLLING MANEUVER. THE STATED REASON FOR EXECUTING THIS MANEUVER WAS TO AVOID AN ACFT APCHING FROM THE 10 O'CLOCK POS. HE SAID THE ACFT WAS LEVEL AND COMING RIGHT AT US. I DID NOT SEE THIS ACFT UNTIL IT WAS POINTED OUT TO ME BY THE CAPT APPROX 6-8 SECONDS AFTER HE RETURNED THE ACFT TO WINGS LEVEL UPRIGHT FLT. AT THAT TIME THE ACFT WAS 2-3 MI AT OUR 3 O'CLOCK POS AND GOING AWAY. THE ACFT WAS A LOW WING TYPE OR TYPE, WHITE IN COLOR. THE ACFT WAS ALSO ABOUT 500 FT OR MORE BELOW US. IN MY JUDGEMENT THE MANEUVER THE CAPT USED WAS UNNECESSARY TO AVOID THE OTHER ACFT. THERE WERE NO REVENUE PAX ONBOARD THE ACFT BUT THERE WAS A JUMPSEATING PLT (ALSO A CAPT) WHO IS A COMPANY PLT HE WAS SEATED IN ROW 6 AND WAS NOT ON HEADSET INTERCOM. SINCE THE MANEUVER THE CAPT PERFORMED EXCEEDED 60 DEGS OF BANK, AND INCLUDED GOING THROUGH THE INVERTED POS. I REMINDED HIM THAT THIS WAS CONSIDERED AN AEROBATIC MANEUVER AND AS SUCH IS PROHIBITED. I ALSO ASKED THE CAPT IF HE WANTED TO DECLARE A NEAR MISS WITH STOCKTON APCH. HIS RESPONSE WAS NEGATIVE. THE FLT WAS CONTINUED TO SAN JOSE WITHOUT INCIDENT WHERE I CONDUCTED A THOROUGH POST-FLT. ALTHOUGH NO DAMAGE TO THE ACFT WAS OBSERVED I SUGGESTED THE CAPT GND THE ACFT AND ADVISE COMPANY OFFICIALS. THE CAPT DID NOT GND THE ACFT AND DID NOT RPT THE INCIDENT TO COMPANY OFFICIALS. AFTER CONFERRING WITH PLT UNION OFFICIALS, I, THE FO, RPTED THE INCIDENT TO THE CHIEF PLT. THE ACFT WAS SUBSEQUENTLY GNDED. BOTH THE CAPT AND I WERE IMMEDIATELY SUSPENDED. THE CAPT RESIGNED 48 HRS AFTER THE INCIDENT WHILE I AM WAITING THE OUTCOME OF A COMPANY INVESTIGATION. THE CAPT PERFORMED AN UNAUTHORIZED, UNANNOUNCED, PROHIBITED MANEUVER WITH THE ACFT AND DID NOT RPT THE INCIDENT TO COMPANY FLT MGMNT OFFICIALS. THE ACFT IS CURRENTLY GNDED BEING THOROUGHLY INSPECTED BY QUALIFIED MAINT PERSONNEL. THE CAPT IS NO LONGER WITH THE COMPANY. I FEEL I FULFILLED MY RESPONSIBILITIES AS A FO BY RPTING THIS INCIDENT TO COMPANY OFFICIALS.

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.