# SDR DXTA2026012806661

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: January 24, 2026
- Submitted: February 23, 2026
- Operation: Air carrier
- Aircraft: [N478QS](https://openairdocs.org/aircraft/N478QS), registered now
- Make and model: Emb EMB-505
- Registry model: [EMB EMB-505](https://openairdocs.org/model/embraer-executive-emb-505) (OpenAirDocs)
- Aircraft serial: 50500802
- Aircraft time: 1,532 hours, 1,205 cycles
- System (JASC): [2430 · DC Generating System](https://openairdocs.org/jasc/2430)
- Part: Starter Gen
- Part number: 400SG180Q6
- Part serial: S02119XL
- Condition: Faulty
- Stage of operation: CR
- How discovered: V
- Nature of condition: J, S
- Precautionary procedure: A, G, I
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/DXTA2026012806661

## Discrepancy

WHILE IN CRUISE A GEN 1 OFF CAS APPEARED. WHILE STARTING TO WORK THROUGH QRH, STARTED GETTING A RAPIDLY CHANGING LIST OF CAS MESSAGES & ERRONEOUS INDICATIONS SUCH AS FLUCTUATING ROLL TRIM SETTINGS EVEN THOUGH ACTUAL TRIM FELT THE SAME.  OTHER MESSAGES INCLUDED A TRIM & FLAP FAIL WITH YELLOW X OVER THEIR INDICATIONS. THE ACFT THEN STARTED TO DEPRESSURIZE & WENT INTO ELECTRICAL EMERGENCY WITH A RED CORRESPONDING CAS DISPLAYED. ALL PAX O2 MASKS DEPLOYED. EVENTUALLY RESET GEN 1 & IT CAME BACK ONLINE. AFTER COMING ONLINE THE ACFT STARTED REVERTING BACK TO NORMAL & MADE A NORMAL LANDING.  COMPLIED WITH INSTRUCTIONS OF ETD-2026-P300-025381223 REV A BY PERFORMING THE REBUILDING OF ALL THE CONNECTORS DESCRIBED IN PART A WITH NEW PINS AND SOCKETS AS REQUIRED, COMPLIED WITH PART B - SPLICES REBUILD BY REPLACEMENT OF LISTED SPLICES WITH NEW SPLICES. COMPLIED WITH PART C BY REPLACEMENT OF ALL GROUND STUDS AND SHUNTS LISTED WITH NEW UNITS. PERFORMED ALL THE ELECTRICAL CHECKS DESCRIBED IN PART D AND FOUND CHECKS SATISFACTORY. COMPLIED WITH THE REPLACEMENT OF ALL THE WIRES DESCRIBED IN PART E WITH NEW WIRES. PERFORMED ALL REQUIRED TESTS AND OPS CHKS IAW PART F & FOUND SAME SATISFACTORY. COMPLIED WITH PART G BY THE REPLACEMENT OF ALL LISTED PARTS, LT SHUNT, ELECTRICAL TERMINAL WOO73, LPDU, EPDU, GCU 1 WITH NEW UNITS, GCU 2 WITH A REPAIRED UNIT & LT STARTER GEN WITH AN OVERHAULED UNIT. SWAPPED GIA 1 & GIA 2 AND GEA 1 AND GEA 2 PER PART H OF ETD. ALL MAINTENANCE PERFORMED IAW THE APPLICABLE SECTIONS OF AMM AS LISTED IN ETD 2026-P300-025381223. PERFORMED OPS CHK OF WINDSHIELD HEATING SYSTEM IAW AMM 30-42-00. NO DEFECTS NOTED. PERFORMED MANUAL PASSENGER OXYGEN SYSTEM MODE OPERATIONAL CHECK IAW P300 AMM 35-21-00, NO DEFECTS NOTED. PERFORMED AUTOMATIC PASSENGER OXYGEN SYSTEM MODE FUNCTIONAL CHECK IAW AMM 35-21-00, FOUND ALTITUDE PRESSURE SWITCH TO BE DEFECTIVE. REMOVED AND REPLACED DEFECTIVE ALTITUDE PRESSURE SWITCH IAW AMM 35-01-07-400-801-A PERFORMED SATISFACTORY AIRCRAFT PRESSURIZATION CHECK IAW AMM 21-31-00. NO DEFECTS NOTED. ORIGINAL SUBMISSION DATE: 1-28-2026.

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