An air carrier MD80 crew was overflown by an air carrier saab 340 while waiting takeoff at ord.

Attributes
ACN	359517
Time
Date	199701
Day	Fri
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : ord
State Reference	IL
Altitude	agl bound lower : 0 agl bound upper : 0
Environment
Light	Daylight
Aircraft 1
Operator	common carrier : air carrier
Make Model Name	MD-80 Super 80
Operating Under FAR Part	Part 121
Navigation In Use	Other
Flight Phase	ground : holding
Flight Plan	IFR
Aircraft 2
Operator	common carrier : air carrier
Make Model Name	Saab-Scania Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Navigation In Use	Other Other
Flight Phase	descent : approach landing other
Route In Use	approach : straight in arrival other
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
ASRS Report	359517
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : instrument pilot : commercial
ASRS Report	359505
Events
Anomaly	conflict : ground critical other anomaly other
Independent Detector	other flight crewa
Resolutory Action	none taken : anomaly accepted
Consequence	Other
Supplementary
Primary Problem	Navigational Facility
Air Traffic Incident	other
Situations
ATC Facility	procedure or policy : unspecified

Narrative:

We were given position and hold runway 22L, expect immediate departure, due to aircraft landing runway 27L. There was a blocked transmission ending in runway 22L, but all other information was missing. First officer tried to confirm takeoff clearance with tower, but no response. Again we heard a blocked transmission. First officer tried to confirm, but no reply. I then tried, but heard someone say 'blocked.' I tried 1 more time and finally received a confirmed takeoff clearance with call sign and departure heading. By this time we were overflown by an air carrier saab 340 landing runway 27L. We would not takeoff until a confirmed takeoff clearance including call sign, departure heading, and runway was received. Tower should have given the saab a go around, or the saab crew should have executed their own go around. Fortunately there was no incident caused by multiple radio transmission being blocked.

Original NASA ASRS Text

Title: AN ACR MD80 CREW WAS OVERFLOWN BY AN ACR SAAB 340 WHILE WAITING TKOF AT ORD.

Narrative: WE WERE GIVEN POS AND HOLD RWY 22L, EXPECT IMMEDIATE DEP, DUE TO ACFT LNDG RWY 27L. THERE WAS A BLOCKED XMISSION ENDING IN RWY 22L, BUT ALL OTHER INFO WAS MISSING. FO TRIED TO CONFIRM TKOF CLRNC WITH TWR, BUT NO RESPONSE. AGAIN WE HEARD A BLOCKED XMISSION. FO TRIED TO CONFIRM, BUT NO REPLY. I THEN TRIED, BUT HEARD SOMEONE SAY 'BLOCKED.' I TRIED 1 MORE TIME AND FINALLY RECEIVED A CONFIRMED TKOF CLRNC WITH CALL SIGN AND DEP HDG. BY THIS TIME WE WERE OVERFLOWN BY AN ACR SAAB 340 LNDG RWY 27L. WE WOULD NOT TKOF UNTIL A CONFIRMED TKOF CLRNC INCLUDING CALL SIGN, DEP HDG, AND RWY WAS RECEIVED. TWR SHOULD HAVE GIVEN THE SAAB A GAR, OR THE SAAB CREW SHOULD HAVE EXECUTED THEIR OWN GAR. FORTUNATELY THERE WAS NO INCIDENT CAUSED BY MULTIPLE RADIO XMISSION BEING BLOCKED.

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.