PA25 pilot experiences a near midair collision in the traffic pattern for runway 18 at zph with an A...

Narrative:

After releasing a glider at 3;000 AGL and descending to traffic pattern altitude (1;000 AGL) rolled out to enter a right base leg for runway 18 at zph. A grumman AA5 was coming at me slightly to the left of my nose in level flight at about 1;000 ft AGL. I pulled up and missed the aircraft by an estimated 50-100 ft. The AA5 took no evasive action and did not respond to a radio call. The AA5 continued on a long; wide downwind for left traffic on runway 22. The AA5 finally made a radio call turning base. No response about the near miss.zph is a very busy airport; with sky diving and glider operations on weekends. Per agreement with the airport; skydiving and glider operations are conducted on runway 18/36; with normal operations on runway 4/22; wind permitting. All traffic is to the west of the airport; right hand pattern for 18 and 22; left hand pattern for 36 and 04.the glider and skydiving operations report downwind and/or base prior to entry and base to final. These operations have worked will for many years; when everybody monitors the CTAF frequency. It appears that the AA5 did not make a pattern entry call or was on the wrong frequency. The AA5 is a regular user of zph and may be based there.

Original NASA ASRS Text

Title: PA25 pilot experiences a NMAC in the traffic pattern for Runway 18 at ZPH with an AA5 entering for left traffic for Runway 22. The AA5 pilot is not on the CTAF and takes no evasive action.

Narrative: After releasing a glider at 3;000 AGL and descending to traffic pattern altitude (1;000 AGL) rolled out to enter a right base leg for Runway 18 at ZPH. A Grumman AA5 was coming at me slightly to the left of my nose in level flight at about 1;000 FT AGL. I pulled up and missed the aircraft by an estimated 50-100 FT. The AA5 took no evasive action and did not respond to a radio call. The AA5 continued on a long; wide downwind for left traffic on Runway 22. The AA5 finally made a radio call turning base. No response about the near miss.ZPH is a very busy airport; with sky diving and glider operations on weekends. Per agreement with the airport; skydiving and glider operations are conducted on Runway 18/36; with normal operations on Runway 4/22; wind permitting. All traffic is to the west of the airport; right hand pattern for 18 and 22; left hand pattern for 36 and 04.The glider and skydiving operations report downwind and/or base prior to entry and base to final. These operations have worked will for many years; when everybody monitors the CTAF frequency. It appears that the AA5 did not make a pattern entry call or was on the wrong frequency. The AA5 is a regular user of ZPH and may be based there.

Data retrieved from NASA's ASRS site as of July 2013 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.

Attributes
ACN	1061450
Time
Date	201301
Local Time Of Day	1201-1800
Place
Locale Reference	ZPH.Airport
State Reference	FL
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Make Model Name	PA-25 Pawnee
Operating Under FAR Part	Part 91
Flight Phase	Initial Approach
Aircraft 2
Make Model Name	Cheetah Tiger Traveler AA5 Series
Operating Under FAR Part	Part 91
Flight Phase	Initial Approach
Person 1
Function	Pilot Flying Single Pilot
Qualification	Flight Crew Air Transport Pilot (ATP) Flight Crew Flight Instructor Flight Crew Multiengine Flight Crew Instrument
Experience	Flight Crew Last 90 Days 25 Flight Crew Total 14000 Flight Crew Type 500
Events
Anomaly	Conflict NMAC
Miss Distance	Horizontal 50 Vertical 50

PA25 pilot experiences a near midair collision in the traffic pattern for runway 18 at zph with an AA5 entering for left traffic for runway 22. The AA5 pilot is not on the CTAF and takes no evasive action.