SDR ASAA2017091221924

Service difficulty report · Antenna · Boeing 737990ER

Difficulty date: September 12, 2017
Submitted: September 25, 2017
Operation: Air carrier
Aircraft: N467AS
Make and model: Boeing 737990ER
Aircraft serial: 36362
Aircraft time: 13,181 hours, 4,379 cycles
System (JASC): 3442 · Weather Radar System
Part: Antenna
Part number: 6225137601
Condition: Corroded
Location: Wx Radar Sys
Stage of operation: NR
How discovered: 9
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 SHOWING GROUND RETURN AT 40-80 NM IN AUTO MODE. IN MANUAL WEATHER MODE CHECKS OK. GAIN IN NORMAL POSITION, TRIANGLE POINTING UP. ACFT GROUNDED. ACCOMPLISHED A WEATHER RADAR SYSTEM TEST, AND CONFIRMED EXCESSIVE GROUND CLUTTER. INSPECTION OF WAVE GUIDE SHOWED NO SIGNS OF WATER. INSPECTION OF ANTENNA SHOWED SIGNS OF LIGHT CORROSION. REPLACED THE ANTENNA. ALL OPS NORMAL. WEATHER RADAR SYSTEM TEST PASSED IAW AMM 34-43-11, AND 34-43-00.