Flight crew of an atx twin, during a crew training flight, failed to change frequency as requested resulting in another aircraft taking evasive action to avoid a collision.

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Attributes
ACN	318380
Time
Date	199510
Day	Thu
Local Time Of Day	1201 To 1800
Place
Locale Reference	atc facility : oak
State Reference	CA
Altitude	msl bound lower : 3000 msl bound upper : 3000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : oak tower : lax
Operator	common carrier : air taxi
Make Model Name	Golden Eagle 421
Operating Under FAR Part	Part 91
Flight Phase	cruise other
Aircraft 2
Operator	common carrier : air carrier
Make Model Name	Commercial Fixed Wing
Operating Under FAR Part	other : unknown
Flight Phase	descent other
Flight Plan	IFR
Person 1
Affiliation	company : air taxi
Function	instruction : instructor oversight : pic
Qualification	pilot : cfi pilot : atp
Experience	flight time last 90 days : 50 flight time total : 4000 flight time type : 400
ASRS Report	318380
Person 2
Affiliation	company : air taxi
Function	instruction : trainee
Qualification	pilot : instrument pilot : commercial
Events
Anomaly	conflict : airborne less severe non adherence : clearance non adherence : required legal separation other anomaly other
Independent Detector	other flight crewa other other : unspecified
Resolutory Action	flight crew : took evasive action
Consequence	Other
Miss Distance	horizontal : 600 vertical : 0
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

Bay approach shipped us from 127.0 to 135.4. I saw my student dial in the new frequency, but in the heat of instruction missed that he had not flipped the frequencys and checked in on the new one. Lulled into complacency by the constant chatter of the (old controller's) normal workload, I proceeded with tutoring my student. I never saw the dornier until he was about 200 yds away and pulling up abruptly from what was possibly an imminent mid-air collision. Obvious lessons here which I would do well to reinforce in myself.

Original NASA ASRS Text

Title: FLC OF AN ATX TWIN, DURING A CREW TRAINING FLT, FAILED TO CHANGE FREQ AS REQUESTED RESULTING IN ANOTHER ACFT TAKING EVASIVE ACTION TO AVOID A COLLISION.

Narrative: BAY APCH SHIPPED US FROM 127.0 TO 135.4. I SAW MY STUDENT DIAL IN THE NEW FREQ, BUT IN THE HEAT OF INSTRUCTION MISSED THAT HE HAD NOT FLIPPED THE FREQS AND CHKED IN ON THE NEW ONE. LULLED INTO COMPLACENCY BY THE CONSTANT CHATTER OF THE (OLD CTLR'S) NORMAL WORKLOAD, I PROCEEDED WITH TUTORING MY STUDENT. I NEVER SAW THE DORNIER UNTIL HE WAS ABOUT 200 YDS AWAY AND PULLING UP ABRUPTLY FROM WHAT WAS POSSIBLY AN IMMINENT MID-AIR COLLISION. OBVIOUS LESSONS HERE WHICH I WOULD DO WELL TO REINFORCE IN MYSELF.

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.