Pilot of small aircraft attempting a practice ILS approach at tnt observed 2 air carrier training aircraft in traffic pattern. Pilot of small aircraft was announcing his intentions on unicom, but was finally advised he was on the wrong frequency. Frequency change was recent.

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Attributes
ACN	133233
Time
Date	199001
Day	Tue
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : tnt
State Reference	FL
Altitude	msl bound lower : 500 msl bound upper : 1800
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tower : myr
Operator	general aviation : personal
Make Model Name	Small Aircraft, High Wing, 1 Eng, Fixed Gear
Flight Phase	climbout : intermediate altitude descent : approach descent other
Flight Plan	None
Aircraft 2
Operator	common carrier : air carrier
Make Model Name	Widebody, Low Wing, 2 Turbojet Eng
Navigation In Use	Other Other
Flight Phase	descent : approach
Route In Use	approach : visual
Flight Plan	IFR
Person 1
Affiliation	Other
Function	flight crew : single pilot
Qualification	pilot : cfi pilot : commercial pilot : instrument
Experience	flight time last 90 days : 100 flight time total : 2000 flight time type : 400
ASRS Report	133233
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Events
Anomaly	conflict : airborne less severe other spatial deviation
Independent Detector	other other : unspecified cockpit
Resolutory Action	flight crew : took evasive action
Consequence	Other
Miss Distance	horizontal : 5000
Supplementary
Air Traffic Incident	other

Narrative:

We announced presence 8 mi east of tnt on a w-erly heading with intent to make an ILS low approach on 122.8 (as published on current letdown plate). At 3 mi, saw multi engine jet (at 12 O'clock) heading east and climbing, about 2 mi away. I altered course to northwest to downwind, and then on ILS outbnd downwind had multi pass to the west about 2/3 mi off left wing. Proceeded with ILS approach, calling OM inbound on 122.8, heading 090 degrees. At 600' AGL, safety pilot saw multi-engine jet on missed approach on reciprocal heading; i.e., 270 degrees at about 1 NM. We broke off to the right, heading 135 degrees. Called for a radio check on 122.8 and was told they had another frequency, 123.0. Then heard an air carrier heavy trainer talking about us, and then also heard another air carrier trainer on frequency. We announced we were departing to the southeast. On landing called FSS and requested frequency for tnt, and told the new one of 123.0 eff 1.5 on 90. We were unaware of unicom frequency change.

Original NASA ASRS Text

Title: PLT OF SMA ATTEMPTING A PRACTICE ILS APCH AT TNT OBSERVED 2 ACR TRAINING ACFT IN TRAFFIC PATTERN. PLT OF SMA WAS ANNOUNCING HIS INTENTIONS ON UNICOM, BUT WAS FINALLY ADVISED HE WAS ON THE WRONG FREQ. FREQ CHANGE WAS RECENT.

Narrative: WE ANNOUNCED PRESENCE 8 MI E OF TNT ON A W-ERLY HDG WITH INTENT TO MAKE AN ILS LOW APCH ON 122.8 (AS PUBLISHED ON CURRENT LETDOWN PLATE). AT 3 MI, SAW MULTI ENG JET (AT 12 O'CLOCK) HDG E AND CLBING, ABOUT 2 MI AWAY. I ALTERED COURSE TO NW TO DOWNWIND, AND THEN ON ILS OUTBND DOWNWIND HAD MULTI PASS TO THE W ABOUT 2/3 MI OFF LEFT WING. PROCEEDED WITH ILS APCH, CALLING OM INBND ON 122.8, HDG 090 DEGS. AT 600' AGL, SAFETY PLT SAW MULTI-ENG JET ON MISSED APCH ON RECIPROCAL HDG; I.E., 270 DEGS AT ABOUT 1 NM. WE BROKE OFF TO THE RIGHT, HDG 135 DEGS. CALLED FOR A RADIO CHK ON 122.8 AND WAS TOLD THEY HAD ANOTHER FREQ, 123.0. THEN HEARD AN ACR HVY TRAINER TALKING ABOUT US, AND THEN ALSO HEARD ANOTHER ACR TRAINER ON FREQ. WE ANNOUNCED WE WERE DEPARTING TO THE SE. ON LNDG CALLED FSS AND REQUESTED FREQ FOR TNT, AND TOLD THE NEW ONE OF 123.0 EFF 1.5 ON 90. WE WERE UNAWARE OF UNICOM FREQ CHANGE.

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