As B727-100 was dispatched with the WX radar transmitter receiver installed improperly.

Attributes
ACN	376188
Time
Date	199707
Day	Thu
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : zzz
State Reference	US
Altitude	agl bound lower : 0 agl bound upper : 0
Environment
Light	Daylight
Aircraft 1
Operator	common carrier : air carrier
Make Model Name	B727-100
Operating Under FAR Part	Part 121
Flight Phase	other
Flight Plan	None
Person 1
Affiliation	company : air carrier
Function	other personnel other
Qualification	other other : other
ASRS Report	376188
Events
Anomaly	aircraft equipment problem : less severe non adherence : published procedure non adherence : far other anomaly other
Independent Detector	other flight crewa other other : unspecified cockpit
Resolutory Action	none taken : detected after the fact
Consequence	Other
Supplementary
Primary Problem	Aircraft
Air Traffic Incident	other

Narrative:

Installed radar receiver/transmitter in aircraft nxxx (B727-100). Followed both maintenance manual and air carrier 'C' check card for installation and operations check for radar receiver/transmitter. Ground test passed even though the wave guide cover plate was left on radar receiver/transmitter after installation. Since this was my first installation I was unaware of the wave guide cover plate or its affect on the radar system. Neither the boeing maintenance manual nor the air carrier check cards state to remove the wave guide cover. This same incident has occurred at least 6 times in the past 6 months. Although most technicians would have known or remembered to remove the wave guide cover, I did not -- this being the first time I have installed one (radar receiver/transmitter). Removing the wave guide cover should be a step included in both the maintenance manual and 'C' check cards.

Original NASA ASRS Text

Title: AS B727-100 WAS DISPATCHED WITH THE WX RADAR XMITTER RECEIVER INSTALLED IMPROPERLY.

Narrative: INSTALLED RADAR RECEIVER/XMITTER IN ACFT NXXX (B727-100). FOLLOWED BOTH MAINT MANUAL AND ACR 'C' CHK CARD FOR INSTALLATION AND OPS CHK FOR RADAR RECEIVER/XMITTER. GND TEST PASSED EVEN THOUGH THE WAVE GUIDE COVER PLATE WAS LEFT ON RADAR RECEIVER/XMITTER AFTER INSTALLATION. SINCE THIS WAS MY FIRST INSTALLATION I WAS UNAWARE OF THE WAVE GUIDE COVER PLATE OR ITS AFFECT ON THE RADAR SYS. NEITHER THE BOEING MAINT MANUAL NOR THE ACR CHK CARDS STATE TO REMOVE THE WAVE GUIDE COVER. THIS SAME INCIDENT HAS OCCURRED AT LEAST 6 TIMES IN THE PAST 6 MONTHS. ALTHOUGH MOST TECHNICIANS WOULD HAVE KNOWN OR REMEMBERED TO REMOVE THE WAVE GUIDE COVER, I DID NOT -- THIS BEING THE FIRST TIME I HAVE INSTALLED ONE (RADAR RECEIVER/XMITTER). REMOVING THE WAVE GUIDE COVER SHOULD BE A STEP INCLUDED IN BOTH THE MAINT MANUAL AND 'C' CHK CARDS.

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.