<< >> NASA ASRS Report 477560, July 2000

Flight crew of a beech 1900 lost communications with approach control 20 mi out and was able to reestablish contact through tower ground control.

Attributes
ACN	477560
Time
Date	200007
Day	Sat
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : iad.airport
State Reference	VA
Altitude	msl single value : 5000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : iad.tracon tower : iad.tower
Operator	common carrier : air carrier
Make Model Name	Beech 1900
Operating Under FAR Part	Part 135
Navigation In Use	other
Flight Phase	descent : vacating altitude
Route In Use	approach : instrument precision arrival : on vectors
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp pilot : cfi
Experience	flight time last 90 days : 160 flight time total : 15000 flight time type : 8000
ASRS Report	477560
Person 2
Function	controller : combined local flight crew : first officer
Qualification	pilot : commercial pilot : multi engine pilot : instrument
Events
Anomaly	aircraft equipment problem : less severe other anomaly other
Independent Detector	aircraft equipment other aircraft equipment : com radio other flight crewa
Resolutory Action	controller : provided flight assist flight crew : overcame equipment problem other
Consequence	other
Supplementary
Problem Areas	Aircraft
Primary Problem	Aircraft

Narrative:

Vectored to join ILS runway 19R at dulles at 5000 ft we temporarily lost contact with approach control. I called tower with no contact. Then ground control, who I spoke with, he cleared us for the visual approach. I called TRACON after landing at their request. I explained my theory that our radio channel selector was displaying the wrong frequency and the radio transmitting slightly out of phase. We ran a complete check on the system but it showed no error on the ground.

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Original NASA ASRS Text

Title: FLC OF A BEECH 1900 LOST COMS WITH APCH CTL 20 MI OUT AND WAS ABLE TO REESTABLISH CONTACT THROUGH TWR GND CTL.

Narrative: VECTORED TO JOIN ILS RWY 19R AT DULLES AT 5000 FT WE TEMPORARILY LOST CONTACT WITH APCH CTL. I CALLED TWR WITH NO CONTACT. THEN GND CTL, WHO I SPOKE WITH, HE CLRED US FOR THE VISUAL APCH. I CALLED TRACON AFTER LNDG AT THEIR REQUEST. I EXPLAINED MY THEORY THAT OUR RADIO CHANNEL SELECTOR WAS DISPLAYING THE WRONG FREQ AND THE RADIO XMITTING SLIGHTLY OUT OF PHASE. WE RAN A COMPLETE CHK ON THE SYS BUT IT SHOWED NO ERROR 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.