<< >> NASA ASRS Report 177144, April 1991

Air carrier X deviation from clearance route because of WX factors encountered radio communication problem overlapping frequency.

Attributes
ACN	177144
Time
Date	199104
Day	Mon
Local Time Of Day	0601 To 1200
Place
Locale Reference	atc facility : lch
State Reference	LA
Altitude	msl bound lower : 33000 msl bound upper : 33000
Environment
Flight Conditions	Marginal
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zhu tower : iah artcc : zjx
Operator	common carrier : air carrier
Make Model Name	Large Transport, Low Wing, 3 Turbojet Eng
Flight Phase	cruise other
Route In Use	enroute : on vectors
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 220 flight time total : 15000 flight time type : 9000
ASRS Report	177144
Person 2
Affiliation	government : faa
Function	controller : radar
Qualification	controller : radar
Events
Anomaly	inflight encounter : weather other anomaly other
Independent Detector	other flight crewa
Resolutory Action	none taken : unable
Consequence	Other
Supplementary
Primary Problem	Navigational Facility
Air Traffic Incident	other

Narrative:

Air carrier X changed to ZHU frequency 128.1. That is also houston clearance delivery frequency (iah cpt). The iah cpt was so much stronger than the center that communications were almost impossible! No alternate frequency was available! We had been deviating around thunderstorms, but fortunately were on a safe heading at the time. We flew out at the interference in 5 mins. Callback conversation with reporter revealed the following: the reporter stated he reported the frequency overlap problem to ZHU. The reporter has not flown route again, so he does not know if the problem is ongoing. Callback conversation with iah ATCT revealed the following: planning and procedures office has not heard of a frequency overlap with the center. Callback conversation with ZHU revealed the following: the specialist in chart of frequency problems had not had the frequency overlap with iah ATCT reported to his office. The specialist stated frequency 128.1 has been changed.

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Original NASA ASRS Text

Title: ACR X DEVIATION FROM CLRNC ROUTE BECAUSE OF WX FACTORS ENCOUNTERED RADIO COM PROBLEM OVERLAPPING FREQ.

Narrative: ACR X CHANGED TO ZHU FREQ 128.1. THAT IS ALSO HOUSTON CLRNC DELIVERY FREQ (IAH CPT). THE IAH CPT WAS SO MUCH STRONGER THAN THE CENTER THAT COMS WERE ALMOST IMPOSSIBLE! NO ALTERNATE FREQ WAS AVAILABLE! WE HAD BEEN DEVIATING AROUND TSTMS, BUT FORTUNATELY WERE ON A SAFE HDG AT THE TIME. WE FLEW OUT AT THE INTERFERENCE IN 5 MINS. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING: THE RPTR STATED HE RPTED THE FREQ OVERLAP PROB TO ZHU. THE RPTR HAS NOT FLOWN RTE AGAIN, SO HE DOES NOT KNOW IF THE PROB IS ONGOING. CALLBACK CONVERSATION WITH IAH ATCT REVEALED THE FOLLOWING: PLANNING AND PROCS OFFICE HAS NOT HEARD OF A FREQ OVERLAP WITH THE CENTER. CALLBACK CONVERSATION WITH ZHU REVEALED THE FOLLOWING: THE SPECIALIST IN CHART OF FREQ PROBS HAD NOT HAD THE FREQ OVERLAP WITH IAH ATCT RPTED TO HIS OFFICE. THE SPECIALIST STATED FREQ 128.1 HAS BEEN CHANGED.

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.