Service difficulty report · Drive Unit · Boeing 737990ER

Difficulty date
February 22, 2018
Submitted
February 26, 2018
Operation
Air carrier
Aircraft
N471AS
Make and model
Boeing 737990ER
Aircraft serial
41703
Aircraft time
13,459 hours, 4,475 cycles
Part
Drive Unit
Part number
6225135822
Part serial
414XR7
Condition
Failed
Location
Wx Radar Sys
Part time
13,395 hours, 4,453 cycles
Stage of operation
NR
How discovered
O
Nature of condition
J
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 FAIL MESSAGE, TURNED RADAR OFF & BACK ON, THEN HEARD NOISE AND FELT VIBRATION COMING FROM THE NOSE OF THE AIRCRAFT. PWS FAIL MESSAGE ON FINAL WITH ASSOCIATED NOISE AND VIBRATION FROM NOSE OF AIRCRAFT. ACFT GROUNDED. REPLACED THE WEATHER RADAR ANTENNA DRIVE UNIT IAW AMM 34-43-11/401. OPS CHECKED GOOD.