# SDR AALA201909059016

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: September 2, 2019
- Submitted: September 5, 2019
- Operation: Air carrier
- Aircraft: [N816NN](https://openairdocs.org/aircraft/N816NN), registered now
- Make and model: Boeing 737823
- Aircraft serial: 31081
- Aircraft time: 31,395 hours, 12,474 cycles
- System (JASC): [3433 · Microwave Landing System](https://openairdocs.org/jasc/3433)
- Part: Transceiver
- Part number: 8220334003
- Part serial: 40L3VN
- Condition: Unreliable
- Location: Zone 100
- Stage of operation: DE
- How discovered: O
- Nature of condition: N, S
- Precautionary procedure: K
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/AALA201909059016

## Discrepancy

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 ANTENNA 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, AALA201909059017)

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