# SDR AALA202606080382

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: June 6, 2026
- Submitted: June 8, 2026
- Operation: Air carrier
- Aircraft: [N827NN](https://openairdocs.org/aircraft/N827NN), registered now
- Make and model: Boeing 737823
- Aircraft serial: 33209
- Aircraft time: 47,619 hours, 20,371 cycles
- System (JASC): [3416 · Altimeter, Barometric/Encoder](https://openairdocs.org/jasc/3416)
- Part: Antenna
- Condition: No Test
- Location: Zone 100
- Stage of operation: CL
- How discovered: C
- Nature of condition: L
- Precautionary procedure: A
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/AALA202606080382

## Discrepancy

AIRCRAFT WAS GROUNDED: UPON DEPARTURE, AIRCRAFT LATERAL NAVIGATION WOULD NOT ENGAGE.  LOST FLIGHT DIRECTORS AFTER ATTEMPTING TO ENGAGE HEADING MODE. AUTOPILOT AND AUTO THROTTLE WOULD NOT ENGAGE. GEAR HORN WOULD NOT EXTINGUISH.  PWS LIGHT ILLUMINATED AT THE SAME TIME.  DECESION MADE TO RETUN TO STL. NO EMERHENCY DECLARED AND LANDED WITHOUT INCIDENT. MAINTENANCE T/S FOUND RADIO ALT DISAGREE. FOUND #2 R/A RCV ANTENNA RESISTANCE HIGH. REPLACED ALL 4 ANTENNAS PRECAUTIONARY. IAW AMM 34-33-11.

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