<< >> NASA ASRS Report 89483, June 1988

After safety alert from approach controller small aircraft took evasive action to miss IFR traffic at same altitude.

Attributes
ACN	89483
Time
Date	198806
Day	Wed
Local Time Of Day	0601 To 1200
Place
Locale Reference	atc facility : srp
State Reference	AZ
Altitude	msl bound lower : 8000 msl bound upper : 8000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Operator	general aviation : personal
Make Model Name	Small Aircraft, Low Wing, 1 Eng, Retractable Gear
Flight Phase	other
Route In Use	enroute airway : phx
Flight Plan	None
Aircraft 2
Make Model Name	Any Unknown or Unlisted Aircraft Manufacturer
Flight Phase	cruise other
Flight Plan	IFR
Person 1
Affiliation	Other
Function	instruction : instructor
Qualification	pilot : instrument pilot : commercial pilot : cfi
Experience	flight time last 90 days : 210 flight time total : 1100 flight time type : 3
ASRS Report	89483
Person 2
Affiliation	Other
Function	flight crew : single pilot
Events
Anomaly	conflict : nmac non adherence : far
Independent Detector	other flight crewa
Resolutory Action	flight crew : took evasive action
Consequence	Other
Miss Distance	horizontal : 750 vertical : 50
Supplementary
Primary Problem	Flight Crew Human Performance

Narrative:

My student and I were instrument training, after entering a holding pattern at knobb intersection we were notified by phx TRACON of a collision alert. My student looked up. Saw the aircraft, rolled inverted and dove to avoid a collision. The problem was that the controller did not make either the other aircraft or us known to each other. The other aircraft was IFR, we were VFR. Apparently the frequency was congested at the time, preventing the controller from advising either of us of each other.

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Original NASA ASRS Text

Title: AFTER SAFETY ALERT FROM APCH CTLR SMA TOOK EVASIVE ACTION TO MISS IFR TRAFFIC AT SAME ALT.

Narrative: MY STUDENT AND I WERE INSTRUMENT TRNING, AFTER ENTERING A HOLDING PATTERN AT KNOBB INTXN WE WERE NOTIFIED BY PHX TRACON OF A COLLISION ALERT. MY STUDENT LOOKED UP. SAW THE ACFT, ROLLED INVERTED AND DOVE TO AVOID A COLLISION. THE PROB WAS THAT THE CTLR DID NOT MAKE EITHER THE OTHER ACFT OR US KNOWN TO EACH OTHER. THE OTHER ACFT WAS IFR, WE WERE VFR. APPARENTLY THE FREQ WAS CONGESTED AT THE TIME, PREVENTING THE CTLR FROM ADVISING EITHER OF US OF EACH OTHER.

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.