SDR AALA201905239011

Service difficulty report · Antenna · Boeing 737823

Difficulty date: May 22, 2019
Submitted: May 24, 2019
Operation: Air carrier
Aircraft: N814NN
Make and model: Boeing 737823
Aircraft serial: 29562
Aircraft time: 30,607 hours, 12,132 cycles
System (JASC): 3444 · Ground Proximity System
Part: Antenna
Condition: Faulty
Location: Radio Altimeter
Stage of operation: DE
How discovered: O
Nature of condition: N
Precautionary procedure: K

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

What was found

AIRCRAFT WAS GROUNDED: PILOT REPORTS DESCENDING TO 12000, PASSING 13,500 AT 293 KNOTS, AUTO PILOT AND AUTOTHROTTLES ENGAGED, LNAV-VNAV PATH. IN CRUISE CONFIGURATION, WE GOT 3 RED GEAR LIGHTS AND HORN FOR APPROXIMATEY 3-4 SECONDS. THEN NORMAL. ALL INDICATIONS NORMAL DURING CONFIG. MAINTENANCE REPORTS DFDR DOWNLOAD SHOWED LEFT RADIO ALTIMETER FAULTED. REPLACED RADIO ALTIMETER ANTENNAS IAW AMM 34-33-11. OPS CHECKS OF LANDING GEAR WARNING ARE NORMAL IAW AMM 31-51-00.