SDR AALA201909059017

Service difficulty report · Antenna · Boeing 737823

Difficulty date: September 2, 2019
Submitted: September 5, 2019
Operation: Air carrier
Aircraft: N816NN
Make and model: Boeing 737823
Aircraft serial: 31081
Aircraft time: 31,395 hours, 12,474 cycles
System (JASC): 3433 · Microwave Landing System
Part: Antenna
Part number: S67200218
Condition: Unreliable
Location: Zone 100
Stage of operation: DE
How discovered: O
Nature of condition: N, S
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 THROUGH 8000 (LVL CHG, POWER IDLE). ALL RED LIGHTS ON GEAR INDICATORS AND WARNING HORN ON. FLAPS 5 AIRSPEED 210 KIAS. MAINTENANCE REPLACED #1 & #2 R/A R/TS IAW AMM 34-33-21. REPLACED ALL R/A ANTENNAS IAW AMM 34-33-11. NOTE: CORROSION WAS FOUND UNDER RA XMIT #1 AND #2 ANTENNAS. BITE TEST SATISFACTORY. ACCOMPLISHED LAND VERFIED TEST IAW AMM 22-11-00. ACCOMPLISHED HUD OPERATIONAL TEST IAW AMM 34-36-00. (SEE SDR # AALA201909059004, AALA201909059016)