Another air carrier crew had problems with HF radio.

Attributes
ACN	317067
Time
Date	199509
Day	Thu
Local Time Of Day	1201 To 1800
Place
Locale Reference	atc facility : vmr
State Reference	FO
Altitude	msl bound lower : 33000 msl bound upper : 33000
Environment
Flight Conditions	Mixed
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : wsss
Operator	common carrier : air carrier
Make Model Name	B747-C/F
Operating Under FAR Part	Part 121
Navigation In Use	Other
Flight Phase	cruise other cruise other
Route In Use	enroute : other oceanic enroute : pacific
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : flight engineer pilot : atp
Experience	flight time last 90 days : 180 flight time total : 14000 flight time type : 5600
ASRS Report	317067
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Events
Anomaly	inflight encounter : weather other anomaly other
Independent Detector	other flight crewa
Resolutory Action	none taken : unable
Consequence	Other
Supplementary
Primary Problem	Weather
Air Traffic Incident	other

Narrative:

Shortly after departure from sin, we encountered numerous lines of thunderstorms. This was not a problem until we switched to HF and began communicating with sin ATC through air carrier radio. Due to all the different air carrier radios and aircraft using the same HF frequency (89.42), it took some time to put in a request to deviate around WX. Then, we flew over 100 mi before we received clearance to deviate. To make matters worse, we requested a right deviation, but were cleared to deviate left. This put us in a very unsafe position, surrounded by heavy cells and had to change our plan of attack. Also, once you enter the clouds, you can forget about communicating at all with the increase in static on the HF radio. Corrective actions: separate HF frequencys for each air carrier radio in the area. Better yet, direct communication with ATC using satellite communication or ACARS, NOTAMS as to which side of track you can expect clearance to deviate around WX. We need more timely clrncs to deviate around WX in southeast asia.

Original NASA ASRS Text

Title: ANOTHER ACR CREW HAD PROBS WITH HF RADIO.

Narrative: SHORTLY AFTER DEP FROM SIN, WE ENCOUNTERED NUMEROUS LINES OF TSTMS. THIS WAS NOT A PROB UNTIL WE SWITCHED TO HF AND BEGAN COMMUNICATING WITH SIN ATC THROUGH ACR RADIO. DUE TO ALL THE DIFFERENT ACR RADIOS AND ACFT USING THE SAME HF FREQ (89.42), IT TOOK SOME TIME TO PUT IN A REQUEST TO DEVIATE AROUND WX. THEN, WE FLEW OVER 100 MI BEFORE WE RECEIVED CLRNC TO DEVIATE. TO MAKE MATTERS WORSE, WE REQUESTED A R DEV, BUT WERE CLRED TO DEVIATE L. THIS PUT US IN A VERY UNSAFE POS, SURROUNDED BY HVY CELLS AND HAD TO CHANGE OUR PLAN OF ATTACK. ALSO, ONCE YOU ENTER THE CLOUDS, YOU CAN FORGET ABOUT COMMUNICATING AT ALL WITH THE INCREASE IN STATIC ON THE HF RADIO. CORRECTIVE ACTIONS: SEPARATE HF FREQS FOR EACH ACR RADIO IN THE AREA. BETTER YET, DIRECT COM WITH ATC USING SATELLITE COM OR ACARS, NOTAMS AS TO WHICH SIDE OF TRACK YOU CAN EXPECT CLRNC TO DEVIATE AROUND WX. WE NEED MORE TIMELY CLRNCS TO DEVIATE AROUND WX IN SE ASIA.

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.