A B737-300 was dispatched in non compliance with the incorrect ATC TCASII control panel installed.

Attributes
ACN	593389
Time
Date	200309
Day	Thu
Local Time Of Day	1801 To 2400
Place
Locale Reference	airport : zzz.airport
State Reference	US
Altitude	agl single value : 0
Environment
Light	Night
Aircraft 1
Operator	common carrier : air carrier
Make Model Name	B737-300
Operating Under FAR Part	Part 121
Flight Phase	ground : maintenance ground : maintenance
Person 1
Affiliation	company : air carrier
Function	maintenance : technician
Qualification	technician : airframe technician : powerplant
Experience	maintenance technician : 16
ASRS Report	593389
Person 2
Affiliation	company : air carrier
Function	other personnel other
Events
Anomaly	aircraft equipment problem : critical maintenance problem : improper maintenance non adherence : published procedure
Resolutory Action	none taken : detected after the fact
Consequence	other
Factors
Maintenance	contributing factor : weather contributing factor : schedule pressure performance deficiency : fault isolation performance deficiency : non compliance with legal requirements performance deficiency : logbook entry performance deficiency : installation
Supplementary
Problem Areas	Chart Or Publication Aircraft Maintenance Human Performance
Primary Problem	Maintenance Human Performance

Narrative:

On the date of the occurrence it was near the end of the shift. I was tired and fatigued. It was very hot in the flight deck and the lighting was low. A late inbound PIREP was discovered on the TCASII control panel. I ordered the panel through our maintenance controllers. Part was delivered to the gate. The panel was the same in appearance and installation, including canon plugs. TCASII, operations checks and panel lighting all appeared normal. Completed paperwork, released aircraft for service. The following day, the aircraft was dispatched to ZZZ1. Upon arrival at ZZZ1, the crew again squawked the TCASII/ATC system where further investigation revealed the error.

Original NASA ASRS Text

Title: A B737-300 WAS DISPATCHED IN NON COMPLIANCE WITH THE INCORRECT ATC TCASII CTL PANEL INSTALLED.

Narrative: ON THE DATE OF THE OCCURRENCE IT WAS NEAR THE END OF THE SHIFT. I WAS TIRED AND FATIGUED. IT WAS VERY HOT IN THE FLT DECK AND THE LIGHTING WAS LOW. A LATE INBOUND PIREP WAS DISCOVERED ON THE TCASII CTL PANEL. I ORDERED THE PANEL THROUGH OUR MAINT CTLRS. PART WAS DELIVERED TO THE GATE. THE PANEL WAS THE SAME IN APPEARANCE AND INSTALLATION, INCLUDING CANON PLUGS. TCASII, OPS CHKS AND PANEL LIGHTING ALL APPEARED NORMAL. COMPLETED PAPERWORK, RELEASED ACFT FOR SVC. THE FOLLOWING DAY, THE ACFT WAS DISPATCHED TO ZZZ1. UPON ARR AT ZZZ1, THE CREW AGAIN SQUAWKED THE TCASII/ATC SYS WHERE FURTHER INVESTIGATION REVEALED THE ERROR.

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.