A CRASH THAT IGNITED A FIRE THAT SPREAD TO OTHER BUILDINGS NEARBY. DANA GRIFFIN HAS MORE. >> Reporter: THIS WAS THE TERRIFYING AFTERMATH. >> WE THINK THAT AN AIRPLANE CRASHED INTO THE HOUSE. >> Reporter: A ROW OF TOWNHOMES JUST OUTSIDE PORTLAND, OREGON, GOES UP IN FLAMES. LOOK AS THE PLANE CRASH IS CAUGHT ON CAMERA, A HUGE FIREBALL RISES ABOVE THE NEIGHBORHOOD. >> I DID SEE THE PILOT START VEERING TO THE LEFT, LIKE, VERY HARD. >> THE PLANE MUST BE BURIED IN BETWEEN THESE THREE CONDOS. THERE'S NO SIGN OF IT OUT HERE. >> Reporter: JOHN SAMPSON WAS THERE WHEN THE CESSNA WENT DOWN KILLING THE PILOT AND PASSENGER. >> THERE WAS A HUGE EXPLOSION THAT PRETTY MUCH ROCKED THE WHOLE AREA. >> Reporter: THE FIRE JUMPING FROM HOME TO HOME AS FIREFIGHTERS WORKED FRANTICALLY TO DOUSE THE FLAMES. ONE RESIDENT WAS KILLED, AUTHORITIES SAY. THE SHOCKING MOMENT HEARD ON RADIO TRAFFIC WITH THE TROUT DELL AIRPORT CONTROL TOWER JUST TWO MILES FROM THE CRASH SITE. >> CRASH, CRASH, CRASH. BIG BLACK SMOKE IN A RESIDENTIAL AREA. >> CONFIRMING YOU ARE REPORTING A PLANE CRASH. >> AFFIRMATIVE. TWIN AIRCRAFT. >> INVESTIGATORS SAID THERE WAS NO MAY DAY CALL. WHAT DO YOU MAKE OF THAT? >> THERE WAS NO MAY DAY CALL PERHAPS BECAUSE THE PILOT DIDN'T FEEL IT WAS AN EMERGENCY SITUATION. THE PILOT DID ADMIT TO AIR TRAFFIC THAT HE WAS HAVING HANDLING PROBLEMS AND THIS WAS A TEST FLIGHT. >> Reporter: THE NTSB IS MOVING THE PLANE TO A SECURE FACILITY AS THEY PIECE TOGETHER WHAT WENT WRONG. FIVE F