Narrative:

With the relatively new noise sensors in the environments of myf, I have usually refused the left runway in favor of 28R turning right shortly after departure to stay as far away from the noise sensors as possible, as the aircraft has exceeded the threshold on at least one occasion. On 2/fri/89, however, it was just at dusk. Several aircraft were awaiting departure particularly on 28R and the small aircraft was lightly loaded with just the undersigned and partial fuel on board and I knew the aircraft would climb quickly with a maximum performance takeoff and climb out. Consequently, I accepted the controller's offer for 28L departure. I recall an aeronautical club small aircraft Y departing on 28R as I did the runup and check, making doubly certain all the lights and strobes were on. I was cleared for takeoff and executed a perfect maximum performance takeoff and climb, climbing at about 100 FPM. The autoplt heading bug was on 260 degrees so I would pass south of the sensor. The RPM's were decreased to 2500 and the manifold pressure to 33' which decreases the noise level. I planned to level off just below the floor of the TCA ahead at 1500'. I was passing through 1400' just beginning to drop the nose of the aircraft when I heard the transmission that small aircraft a had just missed him by a few ft (I believe the pilot said 20'). I assume it was the pilot of the small aircraft Y who had taken off earlier from the right runway. My feeling is that safety was compromised by the overwhelming thought of not setting off the noise sensor; by not using the 28R runway for takeoff; by using the maximum performance takeoff and climb which also impairs forward visibility as well as to the right; by not keeping in mind the relative position of the small aircraft Y using the parallel runway to the right and by not factoring in the possibility of wind drift of the slower aircraft figuring that my 20 degree turn to the left from runway centerline would obviate that factor.

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Original NASA ASRS Text

Title: GA-SMA CONCENTRATING ON MISSING NEW NOISE SENSORS HAS NMAC WITH PRECEDING GA-SMA.

Narrative: WITH THE RELATIVELY NEW NOISE SENSORS IN THE ENVIRONMENTS OF MYF, I HAVE USUALLY REFUSED THE LEFT RWY IN FAVOR OF 28R TURNING RIGHT SHORTLY AFTER DEP TO STAY AS FAR AWAY FROM THE NOISE SENSORS AS POSSIBLE, AS THE ACFT HAS EXCEEDED THE THRESHOLD ON AT LEAST ONE OCCASION. ON 2/FRI/89, HOWEVER, IT WAS JUST AT DUSK. SEVERAL ACFT WERE AWAITING DEP PARTICULARLY ON 28R AND THE SMA WAS LIGHTLY LOADED WITH JUST THE UNDERSIGNED AND PARTIAL FUEL ON BOARD AND I KNEW THE ACFT WOULD CLB QUICKLY WITH A MAX PERFORMANCE TKOF AND CLBOUT. CONSEQUENTLY, I ACCEPTED THE CTLR'S OFFER FOR 28L DEP. I RECALL AN AERO CLUB SMA Y DEPARTING ON 28R AS I DID THE RUNUP AND CHK, MAKING DOUBLY CERTAIN ALL THE LIGHTS AND STROBES WERE ON. I WAS CLRED FOR TKOF AND EXECUTED A PERFECT MAX PERFORMANCE TKOF AND CLB, CLBING AT ABOUT 100 FPM. THE AUTOPLT HDG BUG WAS ON 260 DEGS SO I WOULD PASS S OF THE SENSOR. THE RPM'S WERE DECREASED TO 2500 AND THE MANIFOLD PRESSURE TO 33' WHICH DECREASES THE NOISE LEVEL. I PLANNED TO LEVEL OFF JUST BELOW THE FLOOR OF THE TCA AHEAD AT 1500'. I WAS PASSING THROUGH 1400' JUST BEGINNING TO DROP THE NOSE OF THE ACFT WHEN I HEARD THE XMISSION THAT SMA A HAD JUST MISSED HIM BY A FEW FT (I BELIEVE THE PLT SAID 20'). I ASSUME IT WAS THE PLT OF THE SMA Y WHO HAD TAKEN OFF EARLIER FROM THE RIGHT RWY. MY FEELING IS THAT SAFETY WAS COMPROMISED BY THE OVERWHELMING THOUGHT OF NOT SETTING OFF THE NOISE SENSOR; BY NOT USING THE 28R RWY FOR TKOF; BY USING THE MAX PERFORMANCE TKOF AND CLB WHICH ALSO IMPAIRS FORWARD VISIBILITY AS WELL AS TO THE RIGHT; BY NOT KEEPING IN MIND THE RELATIVE POS OF THE SMA Y USING THE PARALLEL RWY TO THE RIGHT AND BY NOT FACTORING IN THE POSSIBILITY OF WIND DRIFT OF THE SLOWER ACFT FIGURING THAT MY 20 DEG TURN TO THE LEFT FROM RWY CENTERLINE WOULD OBVIATE THAT FACTOR.

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.