<< >> NASA ASRS Report 392795, January 1998

A C172 CFI and his student lose their 2-WAY communication while approaching sna on a vector at 3000 ft. Reporter says his radio failure was 'inadvertent.'

Attributes
ACN	392795
Time
Date	199801
Day	Wed
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : sna airport : l66
State Reference	CA
Altitude	msl bound lower : 3000 msl bound upper : 3000
Environment
Flight Conditions	Mixed
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : lax
Operator	general aviation : personal
Make Model Name	Skyhawk 172/Cutlass 172
Operating Under FAR Part	Part 91
Flight Phase	cruise other cruise other
Route In Use	enroute : on vectors
Flight Plan	IFR
Person 1
Affiliation	Other
Function	instruction : instructor oversight : pic
Qualification	pilot : instrument pilot : cfi pilot : commercial
Experience	flight time last 90 days : 100 flight time total : 1100 flight time type : 100
ASRS Report	392795
Person 2
Affiliation	Other
Function	flight crew : single pilot instruction : trainee
Qualification	pilot : private
Events
Anomaly	aircraft equipment problem : critical inflight encounter : weather other anomaly other
Independent Detector	other flight crewa
Resolutory Action	flight crew : declared emergency none taken : unable other
Consequence	Other
Supplementary
Primary Problem	Aircraft
Air Traffic Incident	other

Narrative:

My instrument student and I finished our air work offshore from lgb. We asked for and received a pop-up IFR clearance to sna via radar vectors. On vectors to the sna ILS runway 19R localizer, we experienced a 2-WAY radio failure that was inadvertent. We attempted to contact socal on 121.3 but could not get a response. The last vector took us across the localizer and even after troubleshooting we were still lost communication. We continued to transmit in the blind to notify ATC of our intention to remain above the cloud deck 500 ft below us and attempt to return to sna in VFR conditions. We abandoned our approach and turned eastbound in VFR conditions while squawking 7600. We attempted to descend around the edge of the cloud layer and proceed back to sna below the cloud deck but could not maintain VFR. We then diverted to corona airport and contacted an FSS on landline to report safe on the ground.

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Original NASA ASRS Text

Title: A C172 CFI AND HIS STUDENT LOSE THEIR 2-WAY COM WHILE APCHING SNA ON A VECTOR AT 3000 FT. RPTR SAYS HIS RADIO FAILURE WAS 'INADVERTENT.'

Narrative: MY INST STUDENT AND I FINISHED OUR AIR WORK OFFSHORE FROM LGB. WE ASKED FOR AND RECEIVED A POP-UP IFR CLRNC TO SNA VIA RADAR VECTORS. ON VECTORS TO THE SNA ILS RWY 19R LOC, WE EXPERIENCED A 2-WAY RADIO FAILURE THAT WAS INADVERTENT. WE ATTEMPTED TO CONTACT SOCAL ON 121.3 BUT COULD NOT GET A RESPONSE. THE LAST VECTOR TOOK US ACROSS THE LOC AND EVEN AFTER TROUBLESHOOTING WE WERE STILL LOST COM. WE CONTINUED TO XMIT IN THE BLIND TO NOTIFY ATC OF OUR INTENTION TO REMAIN ABOVE THE CLOUD DECK 500 FT BELOW US AND ATTEMPT TO RETURN TO SNA IN VFR CONDITIONS. WE ABANDONED OUR APCH AND TURNED EBOUND IN VFR CONDITIONS WHILE SQUAWKING 7600. WE ATTEMPTED TO DSND AROUND THE EDGE OF THE CLOUD LAYER AND PROCEED BACK TO SNA BELOW THE CLOUD DECK BUT COULD NOT MAINTAIN VFR. WE THEN DIVERTED TO CORONA ARPT AND CONTACTED AN FSS ON LANDLINE TO RPT SAFE ON THE GND.

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.