Near miss for two light aircraft at tower controlled airport.

Attributes
ACN	115660
Time
Date	198906
Day	Tue
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : geu
State Reference	AZ
Altitude	msl bound lower : 2000 msl bound upper : 2000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tower : geu
Operator	general aviation : personal
Make Model Name	Small Aircraft, Low 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 : private
Experience	flight time last 90 days : 25 flight time total : 96 flight time type : 7
ASRS Report	115660
Person 2
Affiliation	Other
Function	flight crew : single pilot
Events
Anomaly	conflict : nmac
Independent Detector	other flight crewa
Resolutory Action	controller : issued new clearance flight crew : took evasive action other
Consequence	faa : reviewed incident with flight crew
Miss Distance	horizontal : 50
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

Incident occurring while returning to glendale municipal airport on x-country flight from yuma, az in an small aircraft X. Over pir at 4000 MSL, glendale tower was contacted and instructions received to 'enter the 45 for downwind, left base, runway 19'. There was no other visible traffic and no radio traffic on frequency. Proceeded to reach for microphone while beginning bank to left at 2000 MSL to enter 45 and at that instant, glendale tower cleared another aircraft for touch and go. Since I am familiar with glendale's procedure to clear for touch and goes when turning from crosswind to downwind, I began to look for traffic just as the other aircraft small aircraft Y passed in climbing attitude, at my 10 O'clock. I evaded by immediately diving my aircraft, losing approximately 200' of altitude, and banking sharply to the left. The instructor in the other aircraft called over the radio 'plane on the 45...' as we passed. I was told later in the tower that the other aircraft also took evasive action. Leveled my aircraft and started bank to right to keep my aircraft away from airport. Other aircraft was not above me and traveling north in straight and level flight, while I was traveling northeast in a level right bank. Tower contacted me and instructed to 'make 360 degree right turn and follow small aircraft Y. After landing and changing to ground control frequency, controller asked me to come to the tower within 30 mins. After securing aircraft, went to tower and discussed situation, including procedures for entering glendale traffic pattern. It is possible that my wing concealed the other aircraft and that the nose high attitude of the other climbing aircraft concealed me. I do not know why I did not hear any radio communications between tower and the other aircraft prior to the other aircraft's clearance for touch and go. Although all other communications were clear except for clearance delivery at yuma, after arriving at home, I contacted FBO and requested that radios be checked.

Original NASA ASRS Text

Title: NEAR MISS FOR TWO LIGHT ACFT AT TWR CONTROLLED ARPT.

Narrative: INCIDENT OCCURRING WHILE RETURNING TO GLENDALE MUNI ARPT ON X-COUNTRY FLT FROM YUMA, AZ IN AN SMA X. OVER PIR AT 4000 MSL, GLENDALE TWR WAS CONTACTED AND INSTRUCTIONS RECEIVED TO 'ENTER THE 45 FOR DOWNWIND, LEFT BASE, RWY 19'. THERE WAS NO OTHER VISIBLE TFC AND NO RADIO TFC ON FREQ. PROCEEDED TO REACH FOR MICROPHONE WHILE BEGINNING BANK TO LEFT AT 2000 MSL TO ENTER 45 AND AT THAT INSTANT, GLENDALE TWR CLRED ANOTHER ACFT FOR TOUCH AND GO. SINCE I AM FAMILIAR WITH GLENDALE'S PROC TO CLEAR FOR TOUCH AND GOES WHEN TURNING FROM XWIND TO DOWNWIND, I BEGAN TO LOOK FOR TFC JUST AS THE OTHER ACFT SMA Y PASSED IN CLIMBING ATTITUDE, AT MY 10 O'CLOCK. I EVADED BY IMMEDIATELY DIVING MY ACFT, LOSING APPROX 200' OF ALT, AND BANKING SHARPLY TO THE LEFT. THE INSTRUCTOR IN THE OTHER ACFT CALLED OVER THE RADIO 'PLANE ON THE 45...' AS WE PASSED. I WAS TOLD LATER IN THE TWR THAT THE OTHER ACFT ALSO TOOK EVASIVE ACTION. LEVELED MY ACFT AND STARTED BANK TO RIGHT TO KEEP MY ACFT AWAY FROM ARPT. OTHER ACFT WAS NOT ABOVE ME AND TRAVELING NORTH IN STRAIGHT AND LEVEL FLT, WHILE I WAS TRAVELING NE IN A LEVEL RIGHT BANK. TWR CONTACTED ME AND INSTRUCTED TO 'MAKE 360 DEG RIGHT TURN AND FOLLOW SMA Y. AFTER LNDG AND CHANGING TO GND CTL FREQ, CTLR ASKED ME TO COME TO THE TWR WITHIN 30 MINS. AFTER SECURING ACFT, WENT TO TWR AND DISCUSSED SITUATION, INCLUDING PROCS FOR ENTERING GLENDALE TFC PATTERN. IT IS POSSIBLE THAT MY WING CONCEALED THE OTHER ACFT AND THAT THE NOSE HIGH ATTITUDE OF THE OTHER CLIMBING ACFT CONCEALED ME. I DO NOT KNOW WHY I DID NOT HEAR ANY RADIO COMS BETWEEN TWR AND THE OTHER ACFT PRIOR TO THE OTHER ACFT'S CLRNC FOR TOUCH AND GO. ALTHOUGH ALL OTHER COMS WERE CLEAR EXCEPT FOR CLRNC DELIVERY AT YUMA, AFTER ARRIVING AT HOME, I CONTACTED FBO AND REQUESTED THAT RADIOS BE CHECKED.

Data retrieved from NASA's ASRS site as of August 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.