ZOB instructor and developmental involved in operational error complicated with frequency failure.

Attributes
ACN	523895
Time
Date	200109
Day	Tue
Local Time Of Day	1201 To 1800
Place
State Reference	ON
Altitude	msl single value : 2000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zob.artcc
Operator	common carrier : air carrier
Make Model Name	B747-400
Operating Under FAR Part	Part 121
Navigation In Use	other
Flight Phase	cruise : level
Flight Plan	IFR
Aircraft 2
Controlling Facilities	artcc : zob.artcc
Operator	general aviation : corporate
Make Model Name	Harrier
Operating Under FAR Part	Part 91
Flight Phase	cruise : level
Flight Plan	IFR
Person 1
Affiliation	government : faa
Function	controller : radar
Qualification	controller : radar
ASRS Report	523895
Person 2
Affiliation	government : faa
Function	controller : radar
Qualification	controller : developmental
Experience	flight time total : 65
ASRS Report	523894
Events
Anomaly	conflict : airborne critical non adherence : clearance other anomaly other
Independent Detector	atc equipment : conflict alert atc equipment other atc equipment : radar other controllera other controllerb
Resolutory Action	controller : issued new clearance flight crew : took precautionary avoidance action
Miss Distance	horizontal : 7200 vertical : 300
Supplementary
Problem Areas	ATC Human Performance Flight Crew Human Performance
Primary Problem	ATC Human Performance
Air Traffic Incident	Operational Error
Situations
ATC Facility	communication equipment : zob.artcc

Narrative:

B747 took HS25 clearance. Tried to take corrective action. However, both main and standby transmitters failed.

Original NASA ASRS Text

Title: ZOB INSTRUCTOR AND DEVELOPMENTAL INVOLVED IN OPERROR COMPLICATED WITH FREQ FAILURE.

Narrative: B747 TOOK HS25 CLRNC. TRIED TO TAKE CORRECTIVE ACTION. HOWEVER, BOTH MAIN AND STANDBY XMITTERS FAILED.

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.