A mooney M20 instructor and student pilot returned to the E25 traffic pattern without realizing the radio volume was too low. Unable to hear airport traffic they had a near miss with a cessna 172.

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Attributes
ACN	447103
Time
Date	199908
Day	Tue
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : e25.airport
State Reference	AZ
Altitude	msl single value : 3400
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Operator	general aviation : instructional
Make Model Name	M-20 Series Undifferentiated or Other Model
Operating Under FAR Part	Part 91
Navigation In Use	other other vortac
Flight Phase	descent : approach
Route In Use	approach : traffic pattern arrival : vfr
Flight Plan	None
Aircraft 2
Operator	general aviation : personal
Make Model Name	Skyhawk 172/Cutlass 172
Operating Under FAR Part	Part 91
Navigation In Use	other
Flight Phase	descent : approach
Route In Use	arrival : vfr
Flight Plan	None
Person 1
Affiliation	other
Function	instruction : instructor oversight : pic
Qualification	pilot : multi engine pilot : cfi pilot : instrument
Experience	flight time last 90 days : 60 flight time total : 5000 flight time type : 30
ASRS Report	447103
Person 2
Affiliation	other
Function	instruction : trainee
Qualification	pilot : student
Events
Anomaly	aircraft equipment problem : less severe conflict : nmac other anomaly other
Independent Detector	other flight crewa
Resolutory Action	none taken : detected after the fact
Miss Distance	horizontal : 200 vertical : 200
Supplementary
Problem Areas	Flight Crew Human Performance
Primary Problem	Flight Crew Human Performance

Narrative:

M201 (pilot and CFI) was entering pattern for runway 23, following airwork. During airwork, headsets were not in use, speaker system was but volume was turned down. Entering 45 degree leg, pilot donned headset, position announcements were made on 45 degree leg, downwind, base and final. After turning on downwind, we observed a C172 (aircraft B), below and to our left, on a downwind for runway 5. We observed the C172 leave the pattern prior to reaching the normal base leg. Although the C172 and unicom heard us, the volume control position on our receiver prevented us from hearing their calls. The C172 took proper action for the situation, and I talked with a C172 crew member after landing, it was agreed to be an inadvertent occurrence.

Original NASA ASRS Text

Title: A MOONEY M20 INSTRUCTOR AND STUDENT PLT RETURNED TO THE E25 TFC PATTERN WITHOUT REALIZING THE RADIO VOLUME WAS TOO LOW. UNABLE TO HEAR ARPT TFC THEY HAD A NEAR MISS WITH A CESSNA 172.

Narrative: M201 (PLT AND CFI) WAS ENTERING PATTERN FOR RWY 23, FOLLOWING AIRWORK. DURING AIRWORK, HEADSETS WERE NOT IN USE, SPEAKER SYS WAS BUT VOLUME WAS TURNED DOWN. ENTERING 45 DEG LEG, PLT DONNED HEADSET, POS ANNOUNCEMENTS WERE MADE ON 45 DEG LEG, DOWNWIND, BASE AND FINAL. AFTER TURNING ON DOWNWIND, WE OBSERVED A C172 (ACFT B), BELOW AND TO OUR L, ON A DOWNWIND FOR RWY 5. WE OBSERVED THE C172 LEAVE THE PATTERN PRIOR TO REACHING THE NORMAL BASE LEG. ALTHOUGH THE C172 AND UNICOM HEARD US, THE VOLUME CTL POS ON OUR RECEIVER PREVENTED US FROM HEARING THEIR CALLS. THE C172 TOOK PROPER ACTION FOR THE SIT, AND I TALKED WITH A C172 CREW MEMBER AFTER LNDG, IT WAS AGREED TO BE AN INADVERTENT OCCURRENCE.

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.