Narrative:

Flight originated from airline training center at phoenix-goodyear (gyr) airport on may 1988, departure time xa:55 MST. Student was practicing traffic pattern at chandler municipal in an small aircraft, making 1 mi left patterns for runway 22 with the wind 230 at 5 as reported by unicom (frequency 123.0 CTAF). I (CFI and pilot not flying) was making position reports downwind, base, and final and reading checklists (after takeoff and final), when commanded by the student according to crew coordination procedures in training. We had already made 6 traffic patterns at chandler municipal with touch and go's and during the base to final turn of the 7TH pattern at 500' AGL, I spotted a tan small aircraft pass underneath us, missing by approximately 100.' we did a go around and I took the controls and called the small aircraft twice but no response. I returned for landing to query the small aircraft pilot. I met him at the fuel pump. The pilot of the small aircraft was standing on the wing when I asked him if he had a radio. He answered yes and that he was transmitting on 122.8 according to his plate. I told him the frequency was 123.0. He produced an IFR approach plate and taxi chart for chandler stellar (an airport nearby with runways 17/35 and unicom 122.8). I told him he was at chandler municipal and recommended that it is safer to enter an uncontrolled field pattern on a 45 degree entry. He also said he had been handed off from approach (phx) and approach saw no traffic on their scopes, and he never saw our airplane. I believe 'weekend'plts generally lack proper preflight planning and rely too much on radar controllers. They should rely on themselves to see and avoid and use safe practices in congested areas.

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Original NASA ASRS Text

Title: TRAINING IN PROGRESS MAKING TOUCH AND GO LNDGS WHEN ACFT ON FINAL PASSES BELOW REPORTER.

Narrative: FLT ORIGINATED FROM AIRLINE TRNING CENTER AT PHOENIX-GOODYEAR (GYR) ARPT ON MAY 1988, DEP TIME XA:55 MST. STUDENT WAS PRACTICING TFC PATTERN AT CHANDLER MUNICIPAL IN AN SMA, MAKING 1 MI LEFT PATTERNS FOR RWY 22 WITH THE WIND 230 AT 5 AS RPTED BY UNICOM (FREQ 123.0 CTAF). I (CFI AND PLT NOT FLYING) WAS MAKING POS RPTS DOWNWIND, BASE, AND FINAL AND READING CHKLISTS (AFTER TKOF AND FINAL), WHEN COMMANDED BY THE STUDENT ACCORDING TO CREW COORD PROCS IN TRNING. WE HAD ALREADY MADE 6 TFC PATTERNS AT CHANDLER MUNICIPAL WITH TOUCH AND GO'S AND DURING THE BASE TO FINAL TURN OF THE 7TH PATTERN AT 500' AGL, I SPOTTED A TAN SMA PASS UNDERNEATH US, MISSING BY APPROX 100.' WE DID A GO AROUND AND I TOOK THE CTLS AND CALLED THE SMA TWICE BUT NO RESPONSE. I RETURNED FOR LNDG TO QUERY THE SMA PLT. I MET HIM AT THE FUEL PUMP. THE PLT OF THE SMA WAS STANDING ON THE WING WHEN I ASKED HIM IF HE HAD A RADIO. HE ANSWERED YES AND THAT HE WAS XMITTING ON 122.8 ACCORDING TO HIS PLATE. I TOLD HIM THE FREQ WAS 123.0. HE PRODUCED AN IFR APCH PLATE AND TAXI CHART FOR CHANDLER STELLAR (AN ARPT NEARBY WITH RWYS 17/35 AND UNICOM 122.8). I TOLD HIM HE WAS AT CHANDLER MUNICIPAL AND RECOMMENDED THAT IT IS SAFER TO ENTER AN UNCONTROLLED FIELD PATTERN ON A 45 DEG ENTRY. HE ALSO SAID HE HAD BEEN HANDED OFF FROM APCH (PHX) AND APCH SAW NO TFC ON THEIR SCOPES, AND HE NEVER SAW OUR AIRPLANE. I BELIEVE 'WEEKEND'PLTS GENERALLY LACK PROPER PREFLT PLANNING AND RELY TOO MUCH ON RADAR CTLRS. THEY SHOULD RELY ON THEMSELVES TO SEE AND AVOID AND USE SAFE PRACTICES IN CONGESTED AREAS.

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.