Narrative:

During taxi out for departure at tup, a single runway, uncontrolled field, we monitored unicom frequency, requested airport advisory (no traffic was reported), broadcast our taxi and departure intentions, and exercised vigilance for traffic in pattern as we taxied and took the active runway for departure. No inbound traffic reports were heard by either crew member during this, only a light twin taxiing out behind us for departure. Visibility was reported to be 6 mi in haze and because of the position of our communication antenna, we were unable to contact mem center from the ground to pick up our IFR clearance and elected to depart VFR and pick it up in the air. Because this was a 'hot and heavy' takeoff, a.west.I. Power augmentation was required and this procedure required a little more attention to be devoted to the 'inside' during takeoff and climbout to the south.in the left turn from crosswind to downwind for a northeast departure from the pattern, we both looked out and saw a small high wing pass about 500' below us on a very close downwind leg, and at a very low altitude. We were at approximately 1100' AGL. No evasive action was necessary on our part, and I don't know if the other aircraft even saw us or took evasive action himself. Since neither crew member in our aircraft heard his unicom reports, (he may have not made them, or perhaps didn't even have a radio) the only way for us to know of his whereabouts in the vicinity of the airport is to have seen him. Even though our crew exercised all the proper procedures for departing VFR at an uncontrolled field, that does not relieve anyone of the responsibility to see and avoid other VFR traffic, including us. Now, I'm not saying that we were not vigilant for other traffic, because we were. But I will say that we possibly let a busy takeoff and departure divert some of our attention away from the very important responsibility to see and avoid traffic that we did not hear. The point is basic. Something that every private pilot knows -- just because you don't hear 'em, it doesn't mean they aren't there.

Related reports:

Google
 

Original NASA ASRS Text

Title: FLT CREW OF AIR CARRIER SMT TYPE ACFT OBSERVED PROPER PROCS FOR TKOF FROM UNCONTROLLED ARPT BUT AFTER TKOF ENCOUNTERED A VFR SMA PASSING 500'.

Narrative: DURING TAXI OUT FOR DEP AT TUP, A SINGLE RWY, UNCONTROLLED FIELD, WE MONITORED UNICOM FREQ, REQUESTED ARPT ADVISORY (NO TFC WAS REPORTED), BROADCAST OUR TAXI AND DEP INTENTIONS, AND EXERCISED VIGILANCE FOR TFC IN PATTERN AS WE TAXIED AND TOOK THE ACTIVE RWY FOR DEP. NO INBND TFC REPORTS WERE HEARD BY EITHER CREW MEMBER DURING THIS, ONLY A LIGHT TWIN TAXIING OUT BEHIND US FOR DEP. VISIBILITY WAS REPORTED TO BE 6 MI IN HAZE AND BECAUSE OF THE POSITION OF OUR COM ANTENNA, WE WERE UNABLE TO CONTACT MEM CENTER FROM THE GND TO PICK UP OUR IFR CLRNC AND ELECTED TO DEPART VFR AND PICK IT UP IN THE AIR. BECAUSE THIS WAS A 'HOT AND HEAVY' TKOF, A.W.I. POWER AUGMENTATION WAS REQUIRED AND THIS PROC REQUIRED A LITTLE MORE ATTN TO BE DEVOTED TO THE 'INSIDE' DURING TKOF AND CLIMBOUT TO THE SOUTH.IN THE LEFT TURN FROM XWIND TO DOWNWIND FOR A NE DEP FROM THE PATTERN, WE BOTH LOOKED OUT AND SAW A SMALL HIGH WING PASS ABOUT 500' BELOW US ON A VERY CLOSE DOWNWIND LEG, AND AT A VERY LOW ALT. WE WERE AT APPROX 1100' AGL. NO EVASIVE ACTION WAS NECESSARY ON OUR PART, AND I DON'T KNOW IF THE OTHER ACFT EVEN SAW US OR TOOK EVASIVE ACTION HIMSELF. SINCE NEITHER CREW MEMBER IN OUR ACFT HEARD HIS UNICOM REPORTS, (HE MAY HAVE NOT MADE THEM, OR PERHAPS DIDN'T EVEN HAVE A RADIO) THE ONLY WAY FOR US TO KNOW OF HIS WHEREABOUTS IN THE VICINITY OF THE ARPT IS TO HAVE SEEN HIM. EVEN THOUGH OUR CREW EXERCISED ALL THE PROPER PROCS FOR DEPARTING VFR AT AN UNCONTROLLED FIELD, THAT DOES NOT RELIEVE ANYONE OF THE RESPONSIBILITY TO SEE AND AVOID OTHER VFR TFC, INCLUDING US. NOW, I'M NOT SAYING THAT WE WERE NOT VIGILANT FOR OTHER TFC, BECAUSE WE WERE. BUT I WILL SAY THAT WE POSSIBLY LET A BUSY TKOF AND DEP DIVERT SOME OF OUR ATTN AWAY FROM THE VERY IMPORTANT RESPONSIBILITY TO SEE AND AVOID TFC THAT WE DID NOT HEAR. THE POINT IS BASIC. SOMETHING THAT EVERY PRIVATE PLT KNOWS -- JUST BECAUSE YOU DON'T HEAR 'EM, IT DOESN'T MEAN THEY AREN'T THERE.

Data retrieved from NASA's ASRS site as of August 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.