Close proximity two GA small aircraft aircraft in hwd air traffic area.

Attributes
ACN	137551
Time
Date	199002
Day	Sat
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : hwd
State Reference	CA
Altitude	msl bound lower : 900 msl bound upper : 900
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tower : hwd
Operator	general aviation : personal
Make Model Name	Small Aircraft, High Wing, 1 Eng, Fixed Gear
Flight Phase	other
Flight Plan	VFR
Aircraft 2
Make Model Name	Small Aircraft
Flight Phase	climbout : intermediate altitude other
Person 1
Affiliation	Other
Function	flight crew : single pilot
Qualification	pilot : student
ASRS Report	137551
Person 2
Affiliation	Other
Function	flight crew : single pilot
Events
Anomaly	conflict : airborne less severe non adherence : clearance
Independent Detector	other controllera other flight crewa
Resolutory Action	flight crew : took evasive action
Consequence	Other
Miss Distance	horizontal : 500 vertical : 100
Supplementary
Primary Problem	Ambiguous
Air Traffic Incident	Intra Facility Coordination Failure Pilot Deviation other

Narrative:

I was doing pattern work at hwd. Hwd tower was, at the time, using two frequencys for their two parallel runways. I was in the pattern for runway 28L, and requested (and was granted) a right crosswind departure from the airport. Simultaneously, another airplane on the right runway began it's climb, and turned to the left, over 28L. I am not aware of what it's instructions were, as I was listening on the other tower frequency. To avoid collision, I began a left 270 departure over the airport, after informing the tower. This last transmission was apparently not heard by the tower, as the controller queried my turn. I explained that I was making a 270 departure for traffic; the controller cleared me for the departure, which proceeded west/O incident. I suspect that communication between the two local controllers could have been improved to prevent conflicting instructions such as this.

Original NASA ASRS Text

Title: CLOSE PROX TWO GA SMA ACFT IN HWD ATA.

Narrative: I WAS DOING PATTERN WORK AT HWD. HWD TWR WAS, AT THE TIME, USING TWO FREQS FOR THEIR TWO PARALLEL RWYS. I WAS IN THE PATTERN FOR RWY 28L, AND REQUESTED (AND WAS GRANTED) A R XWIND DEP FROM THE ARPT. SIMULTANEOUSLY, ANOTHER AIRPLANE ON THE R RWY BEGAN IT'S CLB, AND TURNED TO THE L, OVER 28L. I AM NOT AWARE OF WHAT IT'S INSTRUCTIONS WERE, AS I WAS LISTENING ON THE OTHER TWR FREQ. TO AVOID COLLISION, I BEGAN A LEFT 270 DEP OVER THE ARPT, AFTER INFORMING THE TWR. THIS LAST XMISSION WAS APPARENTLY NOT HEARD BY THE TWR, AS THE CTLR QUERIED MY TURN. I EXPLAINED THAT I WAS MAKING A 270 DEP FOR TFC; THE CTLR CLRED ME FOR THE DEP, WHICH PROCEEDED W/O INCIDENT. I SUSPECT THAT COM BTWN THE TWO LCL CTLRS COULD HAVE BEEN IMPROVED TO PREVENT CONFLICTING INSTRUCTIONS SUCH AS THIS.

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.