<< >> NASA ASRS Report 197742, December 1991

Commuter has loss of both communication radios, then just prior to localizer intercept approach display failed, 2-3 seconds only.

Attributes
ACN	197742
Time
Date	199112
Day	Thu
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : dfw
State Reference	TX
Altitude	msl bound lower : 6000 msl bound upper : 6000
Environment
Flight Conditions	IMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : dfw
Operator	common carrier : air carrier
Make Model Name	Light Transport, Low Wing, 2 Turboprop Eng
Flight Phase	cruise other
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 100 flight time total : 5000 flight time type : 2000
ASRS Report	197742
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : commercial pilot : atp pilot : instrument
Events
Anomaly	aircraft equipment problem : less severe other anomaly other
Independent Detector	other flight crewa
Resolutory Action	flight crew : overcame equipment problem flight crew : returned to intended course or assigned course
Consequence	Other
Supplementary
Primary Problem	Aircraft
Air Traffic Incident	other

Narrative:

Being vectored for ILS 35R at dfw. Flight lost both communications. Squawked 7600 in transponder and followed lost communication procedure. Also lost both dpu right before localizer interception. Dpu came back on line and we continued approach. Communications came back inside OM and dfw tower cleared us to land. Callback conversation with reporter revealed the following information: reporter states they overflew the final when display was interrupted. Got right back on course. The mechanic showed reporter the roughness on the antenna which was from ice buildup. Believe the ice broke off as soon as they were below the cloud layer, about 2000 ft and radios worked again. No idea why computer display popped off and on, but grateful as they lined up on final and came on in. No go around.

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Original NASA ASRS Text

Title: COMMUTER HAS LOSS OF BOTH COM RADIOS, THEN JUST PRIOR TO LOC INTERCEPT APCH DISPLAY FAILED, 2-3 SECONDS ONLY.

Narrative: BEING VECTORED FOR ILS 35R AT DFW. FLT LOST BOTH COMS. SQUAWKED 7600 IN TRANSPONDER AND FOLLOWED LOST COM PROC. ALSO LOST BOTH DPU RIGHT BEFORE LOC INTERCEPTION. DPU CAME BACK ON LINE AND WE CONTINUED APCH. COMS CAME BACK INSIDE OM AND DFW TWR CLRED US TO LAND. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: RPTR STATES THEY OVERFLEW THE FINAL WHEN DISPLAY WAS INTERRUPTED. GOT RIGHT BACK ON COURSE. THE MECH SHOWED RPTR THE ROUGHNESS ON THE ANTENNA WHICH WAS FROM ICE BUILDUP. BELIEVE THE ICE BROKE OFF AS SOON AS THEY WERE BELOW THE CLOUD LAYER, ABOUT 2000 FT AND RADIOS WORKED AGAIN. NO IDEA WHY COMPUTER DISPLAY POPPED OFF AND ON, BUT GRATEFUL AS THEY LINED UP ON FINAL AND CAME ON IN. NO GAR.

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.