<< >> NASA ASRS Report 592975, September 2003

A military T-39 and a piper cherokee pass within 200 ft of each other during the T-39's missed approach vector from a practice instrument approach at cll, tx. No comment from the local controller.

Attributes
ACN	592975
Time
Date	200309
Day	Sun
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : cll.airport
State Reference	TX
Altitude	msl single value : 1500
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tower : cll.tower
Operator	other
Make Model Name	Military
Operating Under FAR Part	Part 91
Flight Phase	landing : missed approach
Route In Use	arrival : on vectors
Flight Plan	IFR
Aircraft 2
Make Model Name	PA-28 Cherokee/Archer II/Dakota/Pillan/Warrior
Person 1
Affiliation	government : military
Function	flight crew : single pilot
Qualification	pilot : atp
Experience	flight time last 90 days : 130 flight time total : 4800 flight time type : 370
ASRS Report	592975
Person 2
Function	flight crew : single pilot
Events
Anomaly	conflict : nmac non adherence : required legal separation
Independent Detector	other flight crewa
Resolutory Action	flight crew : took evasive action
Miss Distance	horizontal : 200 vertical : 20
Supplementary
Problem Areas	Flight Crew Human Performance ATC Human Performance
Primary Problem	Ambiguous

Narrative:

Practice TACAN low approach to cll runway 10. Missed approach instruction, climbing right turn to 160 degrees. Runway 16 and runway 10 were both duty runways. Executing climb out, 1 mi from departure end of runway 10, approximately 1500 ft MSL, right turn to 160 degrees, about 20 degrees into the turn, the traffic was seen at right 1 O'clock moving to 12 O'clock due to speed differences. T-39, wing leveled, and power reduced to insure separation. Controller tower and other aircraft pilot never saw conflict, or decided to ignore conflict. Busy sunday afternoon, dual two runway operations, tower control, ground control and clearance delivery sounded very much like same person. Student PNF, in right seat of T-39 with his head buried. T-39 TCASII working, so apparently, piper was not squawking. -- What we are doing to correct the situation. -- Require student to stay heads out in traffic areas. -- Increase safety margin by staying at slower airspds in high traffic areas. -- Thoroughly brief conflict avoidance.

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Original NASA ASRS Text

Title: A MIL T-39 AND A PIPER CHEROKEE PASS WITHIN 200 FT OF EACH OTHER DURING THE T-39'S MISSED APCH VECTOR FROM A PRACTICE INST APCH AT CLL, TX. NO COMMENT FROM THE LCL CTLR.

Narrative: PRACTICE TACAN LOW APCH TO CLL RWY 10. MISSED APCH INSTRUCTION, CLBING R TURN TO 160 DEGS. RWY 16 AND RWY 10 WERE BOTH DUTY RWYS. EXECUTING CLBOUT, 1 MI FROM DEP END OF RWY 10, APPROX 1500 FT MSL, R TURN TO 160 DEGS, ABOUT 20 DEGS INTO THE TURN, THE TFC WAS SEEN AT R 1 O'CLOCK MOVING TO 12 O'CLOCK DUE TO SPD DIFFERENCES. T-39, WING LEVELED, AND PWR REDUCED TO INSURE SEPARATION. CTLR TWR AND OTHER ACFT PLT NEVER SAW CONFLICT, OR DECIDED TO IGNORE CONFLICT. BUSY SUNDAY AFTERNOON, DUAL TWO RWY OPS, TWR CTL, GND CTL AND CLRNC DELIVERY SOUNDED VERY MUCH LIKE SAME PERSON. STUDENT PNF, IN R SEAT OF T-39 WITH HIS HEAD BURIED. T-39 TCASII WORKING, SO APPARENTLY, PIPER WAS NOT SQUAWKING. -- WHAT WE ARE DOING TO CORRECT THE SIT. -- REQUIRE STUDENT TO STAY HEADS OUT IN TFC AREAS. -- INCREASE SAFETY MARGIN BY STAYING AT SLOWER AIRSPDS IN HIGH TFC AREAS. -- THOROUGHLY BRIEF CONFLICT AVOIDANCE.

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.