Helicopter Y failed to follow ATC instruction. Pilot deviation. Near midair collision.

Attributes
ACN	138412
Time
Date	199002
Day	Wed
Local Time Of Day	1801 To 2400
Place
Locale Reference	atc facility : bwi
State Reference	MD
Altitude	agl bound lower : 800 agl bound upper : 800
Environment
Flight Conditions	VMC
Light	Night
Aircraft 1
Controlling Facilities	tower : bwi tower : alo
Operator	common carrier : air carrier
Make Model Name	Medium Large Transport, Low Wing, 2 Turbojet Eng
Flight Phase	climbout : initial climbout : takeoff
Flight Plan	VFR
Aircraft 2
Make Model Name	Helicopter
Flight Phase	cruise other
Flight Plan	VFR
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : atp
Experience	flight time last 90 days : 200 flight time total : 3000 flight time type : 1900
ASRS Report	138412
Person 2
Function	flight crew : single pilot
Qualification	other other : other
Events
Anomaly	conflict : nmac non adherence : clearance other spatial deviation
Independent Detector	other flight crewa
Resolutory Action	flight crew : took evasive action
Consequence	faa : reviewed incident with flight crew
Miss Distance	horizontal : 500 vertical : 200
Supplementary
Primary Problem	Flight Crew Human Performance

Narrative:

Cleared for takeoff. Controller stated traffic would cross overhead departure end of runway and traffic on 2 mi final. Captain had traffic ahead, helicopter Y, and I was watching traffic on final to intersection runway. At rotation helicopter Y ahead was still outer runway. Captain had to lower nose of aircraft go under helicopter Y. Traffic passing overhead. Subsequent talks with tower revealed helicopter Y had us in sight, as did tower operator, but helicopter Y deviated from flight path assigned by tower.

Original NASA ASRS Text

Title: HELICOPTER Y FAILED TO FOLLOW ATC INSTRUCTION. PLT DEVIATION. NMAC.

Narrative: CLRED FOR TKOF. CTLR STATED TFC WOULD CROSS OVERHEAD DEP END OF RWY AND TFC ON 2 MI FINAL. CAPT HAD TFC AHEAD, HELI Y, AND I WAS WATCHING TFC ON FINAL TO INTXN RWY. AT ROTATION HELI Y AHEAD WAS STILL OUTER RWY. CAPT HAD TO LOWER NOSE OF ACFT GO UNDER HELI Y. TFC PASSING OVERHEAD. SUBSEQUENT TALKS WITH TWR REVEALED HELI Y HAD US IN SIGHT, AS DID TWR OPERATOR, BUT HELI Y DEVIATED FROM FLT PATH ASSIGNED BY TWR.

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.