A DC10 flight crew while in position and hold lost communication on #1 radio.

Attributes
ACN	526490
Time
Date	200110
Day	Wed
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : lax.airport
State Reference	CA
Altitude	agl single value : 0
Environment
Flight Conditions	IMC
Light	Dawn
Aircraft 1
Operator	common carrier : air carrier
Make Model Name	DC-10 Undifferentiated or Other Model
Flight Phase	ground : takeoff roll ground : position and hold
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : flight engineer pilot : cfi pilot : atp
Experience	flight time last 90 days : 150 flight time total : 14000 flight time type : 6000
ASRS Report	526490
Events
Anomaly	aircraft equipment problem : less severe
Resolutory Action	none taken : detected after the fact
Supplementary
Problem Areas	Aircraft
Primary Problem	Aircraft

Narrative:

We taxied out for takeoff at lax using the #1 radio. It worked fine for ground control. We switched to tower frequency to cross runways 25L and 25R again on the #1 radio. All communications were normal. We were cleared into position and hold on runway 25R. While in position no other communications were heard for about 2 mins. We then heard the tower calling us on 121.5 which was set on the #2 radio. At that time we were cleared for takeoff. The #1 radio appeared to be working again, but later failed intermittently. This was a very unusual problem and monitoring 121.5 on the #2 radio helped the situation.

Original NASA ASRS Text

Title: A DC10 FLT CREW WHILE IN POS AND HOLD LOST COM ON #1 RADIO.

Narrative: WE TAXIED OUT FOR TKOF AT LAX USING THE #1 RADIO. IT WORKED FINE FOR GND CTL. WE SWITCHED TO TWR FREQ TO CROSS RWYS 25L AND 25R AGAIN ON THE #1 RADIO. ALL COMS WERE NORMAL. WE WERE CLRED INTO POS AND HOLD ON RWY 25R. WHILE IN POS NO OTHER COMS WERE HEARD FOR ABOUT 2 MINS. WE THEN HEARD THE TWR CALLING US ON 121.5 WHICH WAS SET ON THE #2 RADIO. AT THAT TIME WE WERE CLRED FOR TKOF. THE #1 RADIO APPEARED TO BE WORKING AGAIN, BUT LATER FAILED INTERMITTENTLY. THIS WAS A VERY UNUSUAL PROB AND MONITORING 121.5 ON THE #2 RADIO HELPED THE SIT.

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.