Narrative:

After takeoff (within first 1/2 of runway) aircraft climbed rapidly. Neither first officer or I received any indication of MM aural or light. Just as I was about to ask him to turn, we received a TCASII TA 400 above and at our 4 O'clock very close. After 5-10 seconds the alert display jumped to 7 O'clock and 200 below. It's possible we simply missed any MM indication with the simultaneous TCASII alert, but it's also possible our altitude may have made any signal much weaker. Tower eventually called us to 50 degree heading as I realized we simply had to be past the MM by now. TCASII signal ended up jumping from 4 to 7 O'clock, to 10 O'clock to 2 O'clock and around again. By now we were heading towards 360 degrees and away from airport. Aside from technological fix for the TCASII, or a different mode of alert (suppress TA's?) below, say, 1000 ft AGL. I think the tower needs to be aware of the possible TCASII distrs an aircrew might face. I also think the MM is a poor selection for the turn point. (Partly because I don't trust the beacons on the medium large transport.) a DME turn point would be great backup, if not a primary turnpoint (use the ILS?).

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Original NASA ASRS Text

Title: FLC OF AN MLG ACR ACFT FAILED TO TURN AFTER TKOF AS CLRED DUE TO NOT RECEIVING THE APPROPRIATE RADIO NAV INDICATION.

Narrative: AFTER TKOF (WITHIN FIRST 1/2 OF RWY) ACFT CLBED RAPIDLY. NEITHER FO OR I RECEIVED ANY INDICATION OF MM AURAL OR LIGHT. JUST AS I WAS ABOUT TO ASK HIM TO TURN, WE RECEIVED A TCASII TA 400 ABOVE AND AT OUR 4 O'CLOCK VERY CLOSE. AFTER 5-10 SECONDS THE ALERT DISPLAY JUMPED TO 7 O'CLOCK AND 200 BELOW. IT'S POSSIBLE WE SIMPLY MISSED ANY MM INDICATION WITH THE SIMULTANEOUS TCASII ALERT, BUT IT'S ALSO POSSIBLE OUR ALT MAY HAVE MADE ANY SIGNAL MUCH WEAKER. TWR EVENTUALLY CALLED US TO 50 DEG HDG AS I REALIZED WE SIMPLY HAD TO BE PAST THE MM BY NOW. TCASII SIGNAL ENDED UP JUMPING FROM 4 TO 7 O'CLOCK, TO 10 O'CLOCK TO 2 O'CLOCK AND AROUND AGAIN. BY NOW WE WERE HDG TOWARDS 360 DEGS AND AWAY FROM ARPT. ASIDE FROM TECHNOLOGICAL FIX FOR THE TCASII, OR A DIFFERENT MODE OF ALERT (SUPPRESS TA'S?) BELOW, SAY, 1000 FT AGL. I THINK THE TWR NEEDS TO BE AWARE OF THE POSSIBLE TCASII DISTRS AN AIRCREW MIGHT FACE. I ALSO THINK THE MM IS A POOR SELECTION FOR THE TURN POINT. (PARTLY BECAUSE I DON'T TRUST THE BEACONS ON THE MLG.) A DME TURN POINT WOULD BE GREAT BACKUP, IF NOT A PRIMARY TURNPOINT (USE THE ILS?).

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.