PLT OF A CESSNA 172 TOOK EVASIVE ACTION ON SHORT FINAL TO LAND AFTER ANOTHER ACFT PULLED OUT ON RWY AND TOOK OFF WITHOUT TWR APPROVAL.

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SEE DIAGRAM ON REVERSE SIDE FOR CLARITY. I WAS CLRED TO LAND ON RWY 16 AT RIC. WAS ABOUT 6 MI OUT. A JETLINER WAS HOLDING FOR ME; WAS TOLD TO GO ONTO RWY 20; AND TURN AROUND 180 DEGS AND HOLD FOR ME TO LAND. THOSE 2 RWYS COME TOGETHER AT THEIR ENDS NEAR FBO. ANOTHER JET HAD A CLRNC TO LEAVE BEFORE THE LINER. HE PULLED UP AND WAS TOLD TO HOLD SHORT; TWR ANNOUNCED 'A CESSNA ON 2 MI FINAL.' I HAD AN AIRLINE TRANSPORT PLT IN THE L SEAT FLYING (HAS OVER 25000 HRS) BUT I WAS PIC BECAUSE HE HAS NO MEDICAL. I WAS LEGALLY THE ONE FLYING THE PLANE. ANYHOW; A THIRD JET PULLED UP AND ROLLED OUT ONTO THE RWY WITH NO CLRNC FROM ANYONE. HE JUST BOPPED ON OUT. THE ATP NEXT TO ME WAS FLYING THE INST GS/LOC SO WAS BUSY SCANNING ONLY INSIDE THE COCKPIT. I WAS DOING THE VFR SCANS AS WELL AS COCKPIT SCANS. JUST BY LUCK; I CAUGHT MOTION UNDER ME AND PUSHED THE NOSE OVER TO SEE WHAT WAS MOVING; IT WAS A THIRD JET. I FIREWALLED THE ENG TO GET SPD TO MAINTAIN CTL AND IF POSSIBLE CLB. I HAD 3 CHOICES: 1) HIT THE THIRD JET BY LNDG ON HIM OR REAR ENDING HIM; 2) HITTING THE JETLINER BROAD SIDE BY TURNING R OR 3) AIMING TO LAND IF I HAD TO ON THE TXWY FOR THE MIL OR IF I HAD CLB PWR TO TRY TO GET OVER THE TREES AND MISS THE SUBDIVISION. I TOOK THE TXWY RTE; POWERED; SWERVED; NOSED DOWN TO STABILIZE THE PLANE; AND YELLED ON THE RADIO ALL WHILE AT THE SAME TIME MAKING ALL THESE DECISIONS. ON THE RADIO I YELLED VERY EXCITEDLY; 'RICHMOND TWR MAN ON THE RWY; A JET ABORT ABORT.' THE JET CONTINUED TO ROLL OUT AS I COLLECTED SPD RIGHT BESIDE HIM. HE PASSED BY ME AS I CLRED THE TREES; THE TWR REITERATED THE JET WAS TOLD TO HOLD SHORT. I SAID NOTHING WEIGHING OUT MORE OPTIONS. THE TWR ANNOUNCED THAT THE (THIRD JET) WAS TOLD TO HOLD SHORT. THE TWR ASKED ME IF I COULD LAND ON RWY 25; WHICH FROM A FAIRLY HIGH ALT; I CUT PWR AND PULLED A CLASSIC SIMULATED OBSTRUCTED FIELD TAILWIND LNDG IN A VERY STEEP APCH. NO PROB. NO DAMAGE TO ANYONE BUT THE CONSEQUENCES COULD HAVE BEEN EXTREMELY SERIOUS. ALL THIS CONVERSATION ON THE RADIOS IS ON TWR TAPE; ATC TAPE; AND THE FLT RECORDER OF THE JETLINER. WAS TOO CLOSE. WE WERE SLOWING DOWN FROM AN APCH SPD OF 120 KTS TO LNDG STALL WITH A NOSE HIGH ATTITUDE; WAS EXTREMELY LUCKY TO HAVE SEEN THE THIRD JET AT ALL. I CALLED THE TWR SUPVR AFTER WHEEL CHOCK; HE WAS VERY GLAD TO HEAR FROM ME. THE CTLR THOUGHT FOR SOME TIME THAT SHE HAD GIVEN BOGUS INSTRUCTIONS THAT HAD CAUSED IT ALL; BUT I AFFIRMED THAT SHE DID NOTHING WRONG. LESSON HERE: EVEN THOUGH YOU ARE IN HIGHLY CTLED SPACE; WHETHER ON THE GND OR IN THE AIR; TAKE NOTHING FOR GRANTED; FLY FIRST; NAV NEXT; COMMUNICATE LAST. KEEP YOUR EYES OUT AT ALL TIMES.