Loss of separation occurred at phl when a B757 departed immediately behind a dash-8 air carrier.

Attributes
ACN	541994
Time
Date	200203
Day	Fri
Local Time Of Day	1801 To 2400
Place
Locale Reference	airport : phl.airport
State Reference	PA
Altitude	msl single value : 3000
Environment
Flight Conditions	VMC
Light	Night
Aircraft 1
Controlling Facilities	tracon : phl.tracon
Operator	common carrier : air carrier
Make Model Name	B757-200
Operating Under FAR Part	Part 121
Navigation In Use	other
Flight Phase	climbout : initial
Flight Plan	IFR
Aircraft 2
Controlling Facilities	tracon : phl.tracon tower : phl.tower
Operator	common carrier : air carrier
Make Model Name	Dash 8 Series Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Flight Phase	climbout : intermediate altitude
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : atp
Experience	flight time last 90 days : 180 flight time total : 13000 flight time type : 4000
ASRS Report	541994
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Events
Anomaly	non adherence : published procedure other spatial deviation
Independent Detector	atc equipment other atc equipment : radar aircraft equipment : tcas other controllera other controllerb other flight crewa other flight crewb
Resolutory Action	controller : issued advisory none taken : detected after the fact
Miss Distance	horizontal : 1000 vertical : 0
Supplementary
Problem Areas	Flight Crew Human Performance ATC Human Performance
Primary Problem	ATC Human Performance
Air Traffic Incident	Operational Error

Narrative:

Cleared for takeoff runway 27L phl. Dash 8 departed ahead of us. Takeoff and initial climb normal, switched over to phl departure, check in. Controller makes callout of 'there looks like there is a dash 8 off your left side.' visually observe dash 8 very close, received TCASII RA, followed RA and turned right. Dash 8 estimated within 1000 ft horizontal at same altitude. RA commanded 3000 FPM climb. Controller comes back and says dash has us in sight. Do not understand this as we approached dash from his 6 O'clock position. I guess he did see us as we went by his right wing. Got the impression the dash was not on departure frequency. As we never heard any controller/dash 8 xmissions. I think dash 8 did not switch to departure frequency after takeoff and may have been on tower frequency.

Original NASA ASRS Text

Title: LOSS OF SEPARATION OCCURRED AT PHL WHEN A B757 DEPARTED IMMEDIATELY BEHIND A DASH-8 ACR.

Narrative: CLRED FOR TKOF RWY 27L PHL. DASH 8 DEPARTED AHEAD OF US. TKOF AND INITIAL CLB NORMAL, SWITCHED OVER TO PHL DEP, CHK IN. CTLR MAKES CALLOUT OF 'THERE LOOKS LIKE THERE IS A DASH 8 OFF YOUR L SIDE.' VISUALLY OBSERVE DASH 8 VERY CLOSE, RECEIVED TCASII RA, FOLLOWED RA AND TURNED R. DASH 8 ESTIMATED WITHIN 1000 FT HORIZ AT SAME ALT. RA COMMANDED 3000 FPM CLB. CTLR COMES BACK AND SAYS DASH HAS US IN SIGHT. DO NOT UNDERSTAND THIS AS WE APCHED DASH FROM HIS 6 O'CLOCK POS. I GUESS HE DID SEE US AS WE WENT BY HIS R WING. GOT THE IMPRESSION THE DASH WAS NOT ON DEP FREQ. AS WE NEVER HEARD ANY CTLR/DASH 8 XMISSIONS. I THINK DASH 8 DID NOT SWITCH TO DEP FREQ AFTER TKOF AND MAY HAVE BEEN ON TWR FREQ.

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.