SDR ASAA2017013119629

Service difficulty report · Radar · Boeing 737990ER

Difficulty date: January 31, 2017
Submitted: February 6, 2017
Operation: Air carrier
Aircraft: N403AS
Make and model: Boeing 737990ER
Aircraft serial: 41730
Aircraft time: 16,975 hours, 5,532 cycles
System (JASC): 3442 · Weather Radar System
Part: Radar
Part number: 6225129802
Part serial: 40F8FP
Condition: Failed
Location: Wx Sys
Part time: 17,025 hours, 5,544 cycles
Stage of operation: CR
How discovered: O
Nature of condition: O
Precautionary procedure: O

As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.

What was found

WEATHER RADAR IS GENERATING FALSE RETURNS FROM 80-160 NM. ADJUSTED GAIN TO NO EFFECT. NO PRECIPITATION SEEN BY ATC OR DISPATCH IN AREAS WHERE RADAR GENERATING RETURNS. RETURNS APPEARED TO BE WORSE IN AUTO MODE. GROUNDED - YES. VERIFIED DISCREPANCY DURING A WEATHER RADAR OPERATIONAL TEST IAW AMM 34-43-00-710-802-001. REPLACED THE CONTROL PANEL IAW AMM 34-43-91/401. OPS CHECKED GOOD. NOW NO FAULTS ARE NOTED WHILE ACCOMPLISHING THE WEATHER RADAR OPERATIONAL CHECK.