Captain of a sikorsky helicopter S58T took evasive action by making a vertical climb and sidestepping to avoid a cessna 150 on final right over the top of the area in which the reporter had been cleared by the tower for takeoff. Near midair collision.

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Attributes
ACN	341939
Time
Date	199607
Day	Sat
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : sjc
State Reference	CA
Altitude	agl bound lower : 0 agl bound upper : 50
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tower : sjc
Operator	general aviation : corporate
Make Model Name	S-58/S-58T Choctaw/Seahorse
Operating Under FAR Part	Part 91
Flight Phase	climbout : takeoff
Flight Plan	VFR
Aircraft 2
Make Model Name	Cessna 150
Operating Under FAR Part	Part 91
Flight Phase	descent : approach landing other
Person 1
Affiliation	Other
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 60 flight time total : 12300 flight time type : 250
ASRS Report	341939
Person 2
Affiliation	Other
Function	flight crew : first officer
Qualification	pilot : instrument pilot : commercial
Events
Anomaly	conflict : nmac non adherence : published procedure other anomaly other
Independent Detector	other flight crewa
Resolutory Action	flight crew : took evasive action
Consequence	Other
Miss Distance	horizontal : 100 vertical : 0
Supplementary
Primary Problem	ATC Human Performance
Air Traffic Incident	Operational Error

Narrative:

While departing from txwys C and west at sjc, we were cleared to depart as a CE150 was on short final to runway 29, immediately adjacent to txwys C and west. Due to the close proximity of runway 29 and the cessna on final, I was forced to deviate toward runway 30L and make a vertical climb into the shaded area of the ht-velocity diagram for my aircraft (sk 58T). Takeoff clearance should have been canceled, as I could not see how far the CE150 was behind me.

Original NASA ASRS Text

Title: CAPT OF A SIKORSKY HELI S58T TOOK EVASIVE ACTION BY MAKING A VERT CLB AND SIDESTEPPING TO AVOID A CESSNA 150 ON FINAL RIGHT OVER THE TOP OF THE AREA IN WHICH THE RPTR HAD BEEN CLRED BY THE TWR FOR TKOF. NMAC.

Narrative: WHILE DEPARTING FROM TXWYS C AND W AT SJC, WE WERE CLRED TO DEPART AS A CE150 WAS ON SHORT FINAL TO RWY 29, IMMEDIATELY ADJACENT TO TXWYS C AND W. DUE TO THE CLOSE PROX OF RWY 29 AND THE CESSNA ON FINAL, I WAS FORCED TO DEVIATE TOWARD RWY 30L AND MAKE A VERT CLB INTO THE SHADED AREA OF THE HT-VELOCITY DIAGRAM FOR MY ACFT (SK 58T). TKOF CLRNC SHOULD HAVE BEEN CANCELED, AS I COULD NOT SEE HOW FAR THE CE150 WAS BEHIND ME.

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.