BE33 instructor and two students report a near midair collision with a small low wing aircraft about...

Narrative:

Student demonstrating a diversion to chd airport at 5500 ft. Student was maneuvering for a right base to runway 4R. About 6nm south of chd at about 2500-3000 ft MSL; during descent I noticed an aircraft appear in my vision from behind my front door post. The aircraft seemed level at about same altitude and around 150-200 ft lateral separation and head on. By the time I could take control to attempt to avoid; the aircraft moved from about my 1:00 to 5:00 position; nearly instantly. I noticed a white piper (warrior) with maroon or orange numbers. It appeared to be a single pilot aboard the other aircraft. After notifying chd tower of near midair collision; I asked if she saw anything on radar. She said that it appears that the aircraft had inoperable transponder. There was no tcad indication of any kind; as well.remain vigilant on scanning; even when in contact with ATC. When workload situations are higher; divide attention accordingly. Scan blind spots (door post) more frequently.

Original NASA ASRS Text

Title: BE33 instructor and two students report a NMAC with a small low wing aircraft about 6 NM south of CHD at 2;500 FT. The other aircraft was detected too late to take evasive action and passed within 200 FT. The other aircraft did not have an operating transponder.

Narrative: Student demonstrating a diversion to CHD airport at 5500 FT. Student was maneuvering for a right base to runway 4R. About 6nm South of CHD at about 2500-3000 FT MSL; during descent I noticed an aircraft appear in my vision from behind my front door post. The aircraft seemed level at about same altitude and around 150-200 FT lateral separation and head on. By the time I could take control to attempt to avoid; the aircraft moved from about my 1:00 to 5:00 position; nearly instantly. I noticed a white piper (warrior) with maroon or orange numbers. It appeared to be a single pilot aboard the other aircraft. After notifying CHD tower of NMAC; I asked if she saw anything on radar. She said that it appears that the aircraft had inoperable transponder. There was no TCAD indication of any kind; as well.Remain vigilant on scanning; even when in contact with ATC. When workload situations are higher; divide attention accordingly. Scan blind spots (door post) more frequently.

Data retrieved from NASA's ASRS site 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	1203761
Time
Date	201409
Local Time Of Day	0001-0600
Place
Locale Reference	CHD.Airport
State Reference	AZ
Environment
Light	Daylight
Aircraft 1
Make Model Name	Bonanza 33
Operating Under FAR Part	Part 91
Flight Phase	Descent
Aircraft 2
Make Model Name	Small Aircraft Low Wing 1 Eng Fixed Gear
Person 1
Function	Pilot Not Flying Check Pilot
Qualification	Flight Crew Air Transport Pilot (ATP)
Person 2
Function	Pilot Flying Trainee
Qualification	Flight Crew Student
Events
Anomaly	Conflict NMAC
Miss Distance	Horizontal 200 Vertical 0

BE33 instructor and two students report a near midair collision with a small low wing aircraft about 6 NM south of chd at 2;500 ft. The other aircraft was detected too late to take evasive action and passed within 200 ft. The other aircraft did not have an operating transponder.